Force and MotionForce and Motion

6th Gr. Science

fcis.ais-dhaka.net:8080/AISD_Conferences/MiddleSchool/Mr_Geyer/S01158835-011589E0 - 12k – site of original powerpoint

6th Gr. Science

fcis.ais-dhaka.net:8080/AISD_Conferences/MiddleSchool/Mr_Geyer/S01158835-011589E0 - 12k – site of original powerpoint

Motion DiscoveryMotion Discovery Each group is set up with a toy. As you work with the toy, analyze the motions of the toys by

answering the following questions in your journal

1. How did you start the toys to move? What was

the push or pull?

2. What did the toy do? Did it roll, bounce, slide, etc.?

3. Which direction did the toy travel? Did it change direction? Why?

4. What happened just before the toy stopped moving?

5. What do you think makes the toy stop?

6. What happened when more force was applied to the toy?

Each group is set up with a toy. As you work with the toy, analyze the motions of the toys by

answering the following questions in your journal

1. How did you start the toys to move? What was

the push or pull?

2. What did the toy do? Did it roll, bounce, slide, etc.?

3. Which direction did the toy travel? Did it change direction? Why?

4. What happened just before the toy stopped moving?

5. What do you think makes the toy stop?

6. What happened when more force was applied to the toy?

Safari MontageSafari Montage

Real World Science: Forces As you watch this video, take notes on the

given Cornell Note Form

Real World Science: Forces As you watch this video, take notes on the

given Cornell Note Form

Sir Isaac NewtonSir Isaac Newton

Isaac Newton 1643-1727 Newton was a great

mathematician and scientist. He took observable natural phenomena and found mathematical relationships

Isaac Newton 1643-1727 Newton was a great

mathematician and scientist. He took observable natural phenomena and found mathematical relationships

ForceForce

Any push or any pull Only unbalanced

forces are able to accelerate or change the motion of objects.

Any push or any pull Only unbalanced

forces are able to accelerate or change the motion of objects.

Force gives an object energy to move, stop moving, or change direction. Blowing your nose, riding your bike, or just breathing all require force

Force gives an object energy to move, stop moving, or change direction. Blowing your nose, riding your bike, or just breathing all require force

A flag is blown by the force of the wind.

A jet is pushed forward by the force of its engines.

A flag is blown by the force of the wind.

A jet is pushed forward by the force of its engines.

Balanced ForcesBalanced Forces

Forces occur in pairs and can be either balanced or unbalanced. Balanced forces DO NOT cause a change in motion. They are equal in size and opposite in direction.

Forces occur in pairs and can be either balanced or unbalanced. Balanced forces DO NOT cause a change in motion. They are equal in size and opposite in direction.

Balanced Force-No MotionBalanced Force-No Motion

If the force in each direction is equal, they cancel each other out and the resulting force is zero. Therefore, there is no change in motion.

If the force in each direction is equal, they cancel each other out and the resulting force is zero. Therefore, there is no change in motion.

Unbalanced ForcesUnbalanced Forces

Unbalanced forces will cause a change in motion ( acceleration).

Unbalanced forces will cause a change in motion ( acceleration).

Unbalanced ForcesUnbalanced Forces

If opposing forces are NOT equal, then the force will be in the direction of the greater force.

Who wins the arm wrestling contest?

If opposing forces are NOT equal, then the force will be in the direction of the greater force.

Who wins the arm wrestling contest?

Unbalanced ForcesUnbalanced Forces

Who wins the tug of war contest? Who wins the tug of war contest?

Force ProblemsForce Problems Two tugboats are moving a barge.

Tugboat A exerts a force of 3000 newtons on the barge. Tugboat B exerts a force of 5000 newtons in the same direction. What is the combined force on the barge?

Draw arrows showing the individual and combined forces of the tugboats in #1.

Two tugboats are moving a barge. Tugboat A exerts a force of 3000 newtons on the barge. Tugboat B exerts a force of 5000 newtons in the same direction. What is the combined force on the barge?

Draw arrows showing the individual and combined forces of the tugboats in #1.

3000 N 5000 N

= 8000 N

Force ProblemsForce Problems Now suppose that Tugboat A exerts a

force of 2000 newtons on the barge and Tugboat B exerts a force of 4000 newtons in the opposite direction. What is the combined force on the barge?

Draw arrows showing the individual and combined forces of the tugboats in #2.

Now suppose that Tugboat A exerts a force of 2000 newtons on the barge and Tugboat B exerts a force of 4000 newtons in the opposite direction. What is the combined force on the barge?

Draw arrows showing the individual and combined forces of the tugboats in #2.

2000 N 4000 N

= 2000 N

Force ProblemsForce Problems

Could there ever be a case when Tugboat A and Tugboat B are both exerting a force on the barge but the barge doesn't move? Draw arrows showing the individual and combined forces in such a situation.

Could there ever be a case when Tugboat A and Tugboat B are both exerting a force on the barge but the barge doesn't move? Draw arrows showing the individual and combined forces in such a situation.

2000 N 2000 N

You Got to Move It Move It!!You Got to Move It Move It!!

Looking at the diagram on the right, are there forces acting on the object? How do you know? Discuss.

If I wanted to change the position of the ball, what would I do? What about remain in motion?

Looking at the diagram on the right, are there forces acting on the object? How do you know? Discuss.

If I wanted to change the position of the ball, what would I do? What about remain in motion?

Part 1, Task 1Part 1, Task 1

Place the marble on the table Are forces acting on it? If so, are they

balanced or unbalanced? How do you know? Describe changes in speed, position, or direction

RECORD ALL ANSWERS ON LAB SHEET!!!

Place the marble on the table Are forces acting on it? If so, are they

balanced or unbalanced? How do you know? Describe changes in speed, position, or direction

RECORD ALL ANSWERS ON LAB SHEET!!!

Part 1, Task 2Part 1, Task 2

One person tap the marble lightly. Are any forces acting on the ball? If so,

are they balanced or unbalanced? How do you know? Describe changes in speed, position, or direction.

RECORD ALL ANSWERS ON LAB SHEET!

One person tap the marble lightly. Are any forces acting on the ball? If so,

are they balanced or unbalanced? How do you know? Describe changes in speed, position, or direction.

RECORD ALL ANSWERS ON LAB SHEET!

Part 1, Task 3Part 1, Task 3

Another student tap the marble a little harder, but not too hard!

How did the position, direction, or speed change from task 2?

Another student tap the marble a little harder, but not too hard!

How did the position, direction, or speed change from task 2?

Part 2 – Speed of the MarblePart 2 – Speed of the Marble

Mark off an area of one meter on the desk. Each student will tap the marble and see who can make it travel the meter distance the fastest.

Mark off an area of one meter on the desk. Each student will tap the marble and see who can make it travel the meter distance the fastest.

On your mark…get set..On your mark…get set.. Use tape to mark a starting line and

another piece to mark the finish line 1 meter away.

When the timer says go, the first person taps the marble. The timer should stop when the marble crosses the finish line.

Calculate the speed (remember units!) Repeat for each person in the group. RECORD DATA IN TABLE ON LAB

PAPER

Use tape to mark a starting line and another piece to mark the finish line 1 meter away.

When the timer says go, the first person taps the marble. The timer should stop when the marble crosses the finish line.

Calculate the speed (remember units!) Repeat for each person in the group. RECORD DATA IN TABLE ON LAB

PAPER