Warm up 11/13

1. Although more than one form of heat transfer is present, which type of heat transfer is heating up soup? 2. The bulb of a thermometer is placed in your mouth. Why does the level of the liquid rises in the thermometer?3. Why does the end of a spoon sticking out of a cup of hot water also gets hot?

Unit 3 Force, mass, and the motion of objects

b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity,

inertia, and friction. c. Demonstrate the effect of

simple machines (lever, inclined plane, pulley, wedge, screw, and

wheel and axle) on work.

Your boss is concerned about damage being done to customer’s

floors and refrigerators as they are being moved into their final

resting place in the kitchen (your refrigerator does not come with

wheels on the bottom).

ProblemYour job is to develop a better way to

move refrigerators into place that eliminates the damage done to floors

and the refrigerator.

Warm up 11/16

• You have 5 minutes to discuss your homework where you went and looked up about “what do we need to know?” for the PBL moving the refrigerator.

• Then your group will share.

Work Session

• Read pages 124-127 do Section Review page 127 all questions

• Read pages 128-132 do Section Review page 133 all questions

• You will present your innovation using any digital tool you wish.You must include• Free Body Diagrams ( before the innovation & after the

innovation )• Description of your innovation (with pictures)• Explanation of how & why it works. Why is it better than

shoving the refrigerator across the floor?

Solution

Warm up 11/17

• What may happen when an object receives unbalanced forces?

• Give an example of something with balanced forces acting on it.

• How does the roughness of surfaces that are touching affect the friction between the surfaces?

Forces

• Push/pull • Affect motion (acceleration ) of object • Measured in units called Newtons (N) • Occur in pairs (ex: person exerts force down on chair:

chair exerts force up on person) • Often unseen : gravity, magnetism • Has size and direction ( 10N →)

Types of forces

• Fnet= Net Force: total of forces acting on an object • Fg = gravitational force • Fa= applied force (push or pull) • Ff = frictional force • Fn = normal force (opposes Fg)

Free Body Diagram

• A book is at rest on a tabletop. Diagram the forces acting on the book.  

Warm up 11/18

• A plastic bag is falling. Diagram the forces acting on the plastic bag as it is falling.

• How do you get a net force of zero?

Classwork check

• Take out yesterday handout as well as the book work from the section review on page 133.

• Swap papers with someone at your table.

Warm up 11/19

•Take everything off of your desk. •Do not write on the test. •Material managers get an iRespond for everyone at your table.

Spring Scale Mini lab

• First off you need to zero your scale by moving the upper metal tab to have the scale read zero.

• Record all data into a chart that you have created• At a constant rate moving your weight attached to the spring

scale measure the force it takes for you to move the weight. • Again everything is done carefully and at a constant speed mve

the weight up your ramp. Measure the force. • Lastly measure the force it takes to lift the weight straight up.

Begin PBL refrigerator lab

• Begin the lab by first reading the directions.

• By tomorrow everyone will have had to of completed the first free body diagram of your refrigerator.

Warm up 11/20

What does friction force oppose?

What force opposes gravity?

Work session

• Work on PBL.

Quiz

• Clear everything off your desk `

Warm up 11/30

Free Write• What science that we have learned about did you encounter over the break?

• Be sure to explain…

Newton’s First Law(law of inertia)

An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted

upon by an unbalanced force.

Newton’s First Law (law of inertia)

•MASS is the measure of the amount of matter in an object.

•It is measured in Kilograms

Newton’s First Law (law of inertia)

• INERTIA is a property of an object that describes how much it will resist change to the motion of the object.

• More mass means more inertia.

Work Session

• Work on PBL be sure to only use the black lined spring scale when performing your trails.

• When you are finished with the PBL grab a Free Body Diagram review hand out.

Warm up

•Get out modifications, all notes from Refrigerator PBL and PBL hand out.

Work Session • With your group members finish part 2 of the PBL

packet. Put modifications on your Refrigerator (brick).

• Once you have finished with the modifications begin testing at your results. Today you will need to use your phone as a timer to figure out acceleration.

• ONLY USE THE BLACK LINED SPRING SCALES.• Start acceleration hand out.

3, 2, 1

• 3– I learned statements…• 2 – Ahas, insights…• 1 – Question I have is…

Warm up 12/7

• If you do not have a cell phone then come grab a laptop.

• Go to Kahoot.it

Work Session

• You have 25 minutes to complete in altercations to your PBL presentation. Everyone is presenting no excuses.

• If your group has presented and/or finished then come up to the front table and grab a handout titled “Calculating Net Forces”

Warm up 12/8

• After watching the video what force is missing that allows the two object to hit the ground at the same time?

• https://youtu.be/KDp1tiUsZw8

• https://youtu.be/7eTw35ZD1Ig

• There are four main types of friction:• Sliding friction: ice skating• Rolling friction: bowling• Fluid friction (air or liquid): air or water

resistance• Static friction: initial friction when moving an

object

Newton’s Second Law

Force equals mass times acceleration.

F = ma

Newton’s Second Law

• Force = Mass x Acceleration• Force is measured in Newtons

ACCELERATION of GRAVITY(Earth) = 9.8 m/s2

• Weight (force) = mass x gravity (Earth)

Newton’s Second Law• Moon’s gravity is 1/6 of the Earth’s• Weight (force) = mass x gravity (Earth)

• If you weigh 420 Newtons on earth, what will you weigh on the Moon?

• If your mass is 41.5Kg on Earth what is your mass on the Moon?

Newton’s Second Law

•WEIGHT is a measure of the force of ________ on the mass of an object

•measured in __________

gravity

Newtons

Warm up 12/10

• How do you get a net force of zero?

• What force opposes gravity?

Newton’s Third Law

For every action there is an equal and opposite reaction.

Think about it . . .What happens if you are standing on a skateboard or a slippery floor and push against a wall? You slide in the opposite direction (away from the wall), because you pushed on the wall but the wall pushed back on you with equal and opposite force.

Why does it hurt so much when you stub your toe? When your toe exerts a force on a rock, the rock exerts an equal force back on

your toe. The harder you hit your toe against it, the more force the rock exerts back on your toe (and the more your toe

hurts).

Action: tire pushes on roadReaction: road pushes on tire

Newton’s 3rd Law

• Suppose you are taking a space walk near the space shuttle, and your safety line breaks. How would you get back to the shuttle?

Newton’s 3rd Law

• The thing to do would be to take one of the tools from your tool belt and throw it is hard as you can directly away from the shuttle. Then, with the help of Newton's second and third laws, you will accelerate back towards the shuttle. As you throw the tool, you push against it, causing it to accelerate. At the same time, by Newton's third law, the tool is pushing back against you in the opposite direction, which causes you to accelerate back towards the shuttle, as desired.

ReviewNewton’s First Law: Objects in motion tend to stay in motion

and objects at rest tend to stay at rest unless acted upon by an unbalanced force.

Newton’s Second Law: Force equals mass times acceleration

(F = ma).

Newton’s Third Law:

For every action there is an equal and opposite reaction.

Vocabulary

•Friction•Force• Gravity•Inertia

•Speed•Net force•Acceleration

•Velocity

Human Paragraph

• Everyone in your group will make a sentence. The first person starts and the rest of the group follows with their own sentence that goes with what you have learned today.

Take everything off your desk

Motion; Speed; Velocity;

Acceleration

What Is Motion?• Motion is when an object changes place or position.

To properly describe motion, you need to use the following:

• Start and end position?• Movement relative to what?• How far did it go?• In what direction did it go?

What Is Speed?

•Speed is the distance an object travels in a certain amount of time.

•To calculate speed, you use the following formula:

Speed (s) = Distance (d) Time (t)

Speed Math Problem

•Suppose you ran 2 km in 10 min. What is your speed?

S = 2 km = 0.2 km/min 10 min

Another Problem

•What is the speed of a car traveling 144 km in 90 minutes?

_______________ km/h

•In miles per hour? __________ mph

Velocity

•Velocity is the speed of an object, but the direction is also included. It is calculated the same as speed, but you must include a direction in your answer.

•Example: the bass boat was moving 12 mph toward the north.

Velocity Problem

• Indicate which of the following are velocities:

a. 125 cm/secb. 30 km/h northwestc. 350m/sec northd. 520 km/h

Acceleration

•Acceleration is the rate of change of velocity. A change in velocity can be either a change in speed, or direction, or both.•Deceleration is when acceleration has a negative value.

Acceleration• The formula for calculating acceleration is:

• Acceleration (a) = final velocity (vf) – initial velocity (vi) time (sec)

• The unit for velocity, in this case, is

m/s/s OR m/s2

Acceleration Math Problem

• A jet starts at rest at the end of a runway and reaches a speed of 80 m/s in 20 s. What is its acceleration?

• Acceleration (a) = final velocity (vf) – initial velocity (vi)

• time (sec)

• a = 80 m/s – 0 m/s = 4 m/s2

• 20 sec

Acceleration Math Problem

• A skateboarder is moving in a straight line at a speed of 3 m/s and comes to a stop in 2 sec. What is his acceleration?

a = 0 m/s - 3 m/s = -1.5 m/s2

2 m/s

Boggle

• 2 minutes: Study notes• 2 minutes: Record any information you can remember

without notes• 2 minutes: Share with one other student. Add his/her

knowledge to your list. • 2 minutes: Leave your buddy. Compare with another student.

Receive a point for each fact that you have that the other student doesn’t have.

Warm up 12/14

• Which planet has more gravity Earth or Jupiter? Why?

• What is the acceleration of a car the was traveling at 40 km/s and had to slam on it’s brakes and stop to avoid a wreck in 2 seconds?

Catapult Lab• Grab the materials needed.

• 2 Big popsicle sticks• 8 small popsicle sticks.• 4 rubber bands• 2 small plastic cups. • Grab a catapult lab packet.

Clean up your area.

Warm up 12/15

• What is the speed of a car that goes 10 miles in 10 minutes?

• What is force?

Warm up 12/16

• Calculate the following acceleration problem: A roller coaster's original velocity is 0 km/s and its final velocity is 30 km/s. The roller coaster ride takes 60 seconds to complete. Find the acceleration.

Warm up 12/17

• What is your weight on a planet that has 10N of acceleration if your mass is 15kg?

Work Session

• Bill Nye Video

• Read pgs. 150-156

• Complete the section review on page 157.

Closing

• Go over Questions from Section Review.

Warm up 1/5

• Happy New Years!• Come in get your science notebook and have a seat.• Write down at least five sentences about things you did

over the break that relate to the science we have learned about so far.

Rules and Procedures

• What are in class rules?

• What are our procedures?

D.R.A.W.

• Yes, it is back and every Tuesday we will have D.R.A.W. lessons.

D.R.A.W.

• Explain the physics of force, mass and acceleration for a NASCAR race car coming out of the pits.

• Draw a free-body diagram for a race car rounding a curve during a race.

• A small, fairly light drag race car accelerates from the starting line at a high rate of speed. Later, a different car, having 3 times as much mass but with an engine that delivers 4 times the force, takes its turn. What is the acceleration of the second car compared to the first car?

Warm up 1/6

•What is the difference between mass and weight?

Quiz Take everything off of your desk except something to write with.

Material Managers grab folders and quiz for group memebers.

Work Session

• You have the opportunity to pick 3 boxes in which you want to complete for this choice board. This will be due tomorrow by the end of class. This will counted as 2 classwork grades.

You’re stuck here until…

• Group 1- Friction• Group 2- Force• Group 3- Gravity• Group 4- Inertia

• Group 5- Acceleration• Group 6- Velocity• Group 7- Motion• Group 8- Net Force

Your group is responsible for defining one of the vocabulary words of this unit in your own words.

Warm up 1/7

• What is the difference between velocity and speed?

• What is the relationship between acceleration and velocity?

Work Session

• Continue working on your choice board they are due 10 minutes before the end of class.

• When you finish the 3 you have chosen you may continue and do more selections for extra credit.

• Turn in to the cubby for your class.

ClosingBe the teacher…

• I will start by throwing the football to a student in which they must answer the question I ask.

• The next step the student will throw the football to another student and ask them a question on what we have been going over in this unit.

Warm up 1/8

•What is inertia?•What law talks about inertia?

Warm up 1/8

•What is inertia?• a tendency to do nothing or to remain unchanged

•What law has talks about inertia? • Newton’s 1st law.

4 Fold Vocabulary Game

• Begin by folding papers into rows, each row having four sections. Fold paper in half until you have 16 boxes.

1st box- WORD 2nd- PICTURE 3rd-DEFINITION 4th- SENTENCE • Friction

• Force• Gravity• Inertia

• Acceleration• Velocity • Motion• Net Force

Kahoot.it

• Take out your phones

• If you do not have one with you today than come grab a laptop.

Warm up 1/11

• A • B

Which picture would have more gravitational force?Why?

Work Session

• Take out 3 sheets of paper. • You will create a 6 page flip book on Inertia and Newton’s

1st Law. • Follow all directions on the handout.

I Care Why…• Inside outside circle. 3 rotations. Stop when the

music stops and talk with the person in front of you.

• Explain the relevancy of Inertia and Newton’s 1st law to your life.

• How might you use knowledge about inertia in your life?

• The people in the hot seat will share what someone else shared with them.

Warm up 1/12

• If a person holds a book, what forces are acting on the book? Is there a net force  present? 

• You toss a ball into the air. Before you release the ball (while your hand is moving) what forces are acting on the ball on its way up? On its way down?

D.R.A.W

• The First Law of Motion in a Car Crash• Annotate the article.  • Write one way you can connect to this article to your life

and make one connection to the world.

• When finished turn into the appropriate tray. Then you can play the 4 fold game with someone else who is done but this is to be done silently.

Kahoot

• If you have a phone go to Kahoot.it and wait for my pin. • If you do not have a phone to play grab a laptop at the

front. Be careful as there is 2 cords plug in to the laptops.

• When turning them in just log off and plug both cords back into it.