Motion and DesignEOG Review Questions

Roger and Frank want to see how far their new model glider can fly. What would be the best way to test the new glider?

a. Let ten of their friends throw the glider one time eachb. Choose one friend to throw the glider many timesc. Throw the glider just onced. Estimate how far the new glider will fly

What is the best definition of a force?

a. A push or pull that changes an object’s motionb. A push or pull that speeds up an objectc. A push or pull that brings an

object to restd. A push or pull that slows down an object

Erik is moving into a new house. He needs to move all of his furniture the same distance, from the truck to the living room. Which of the following pieces will require the least force to move?a. 30 kg b. 5 kg

B.

c. 10 kg D. 100 kg

Todd is riding his skateboard when it hits a curb and comes to a sudden stop. The skateboard stops moving, but Todd continues to move forward. This is an example of what kind of force?

a.Gravityb.Magneticc.Thermald.inertia

Look at the following picture.

Why does a wedge increase the force of a hammer blow?

a. The wedge is stronger than the hammer.b. The shape of the wedge focuses the force of the blow.c. The wedge is longer than it is wide.d. The wedge is made of harder material than the hammer.

What force is assisting the simple machine pictured below?

a.Gravityb.Magnetismc.Inertiad.friction

Simple machines are useful because

a. They increase the amount of energy.b. They reduce friction on moving objects.c. They increase the momentum of moving objects.d. They increase the momentum of moving objects.

Kevin is in a canoe in the water next to a dock. He tries to jump from the canoe onto the dock. What will most likely happen to the canoe when he pushes off to jump?

a. The canoe will move toward the dock and then stop.b. The canoe will stay still.c. The canoe will move away from the dock.d. The canoe will move toward the dock and hit it.

All machines

a.Change the direction of motion of an object.

b.Need a source of energy to work.c.Change the speed of a moving object.d.Increase the amount of force.

Emma rolls a ball on the ground. Eventually, the ball comes to a stop. What force causes the ball to stop rolling?

a. Frictionb. Inertiac. Heatd. magnetism

Jacob’s family went on a skiing trip last winter. At the ski resort, Jacob and his parents put wax on the bottom of their skis. What effect will this have on the skis?

a.The wax will decrease the inertia of the skis.

b.The wax will decrease the friction of the skis.

c.The wax will increase the gravity of the skis.

d.The was will decrease the momentum of the skis.

The forces acting on the pulley shown below are unbalanced.

What could be done to balance the forces on the two sides of the pulley?

a. Pull on the rope until the 3 kg mass is twice as far below the pulley as the 6 kg mass.

b. Add 3 kg of mass to the side of the pulley which already has a 3 kg mass.c. Pull on the rope until the 3 kg mass and the 6 kg mass are the same distance from the pulley.d. Pull on the rope until the 6 kg mass is twice as

far below the pulley as the 3 kg mass.

6 kg3 kg

As Marshall skiis down a hill, his speed increases. Why does this happen?

a. The forces acting on him are unbalanced.b. The forces acting on him are balanced.c. The only force acting on him is gravity. d. Inertia is causing his speed to increase.

http://www.youtube.com/watch?v=-FA9f-4n2ME

Lisa had to push very hard to start a heavy wagon rolling across a flat surface. This property of objects resisting a change in their motion is called

a. Friction.b. Inertia.c. Gravity.d. Resistance.

While Maria is visiting her aunt one winter, there is an ice storm. Maria can slide on the sidewalk, except when her aunt’s neighbor has put sand on the ice. Why is this?

a. There is more gravity from the sand.b. There is more friction when the

sand is on the sidewalk.c. There is more heat from the

sand.d. There is more inertia from the sand.

Why is it harder to push a box across a rough wooden floor than across a smooth wooden floor?

a. The smooth wooden floor has less mass.b. The smooth wooden floor has less gravity.c. The smooth wooden floor has less inertia.d. The smooth wooden floor has less friction.

An unbalanced force is acting on an object. The object must be

a. Standing still.b. Moving at a constant speed.c. Changing speed or changing

directiond. Rotating about an axis.

Which of the following happens because of a noncontact force?

a. A basketball rolling on the floor and hitting the wallb. A basketball falling to the floor when a player lets go

of it.c. A basketball being thrown to another player.d. A basketball rebounding off the rim of the basket.

Which of the following is an example of a simple machine?

a. b.

c. d.

Which of the following could be done more easily using a pulley?

a.Lift a car engineb.Cut a steakc.Hold a piece of wood togetherd.Trim bushes and plants

This diagram shows a light bulb. The bottom of the light bulb is shaped so that the bulb fits securely into a light socket.

Which type of simple machine is the bottom of the bulb?

A leverB pulleyC screwD wedge

Two people are each pulling on the opposite ends of a rope. If they are pulling on the rope with equal but opposite forces, what will happen to the rope?

A It will stay in place between the two people.B It will move toward the right.C It will move toward the left.D It will fall to the ground.

This graph shows the motion of an animal.

0 1 2 3 4 50

5

10

15

20

25

30

Distance vs. Time

Distance vs. Time

Time (s)

Dis

tance

(m

)

When does the animal remain still? A between second 1 and second 2 B between second 2 and second 3 C between second 3 and second 4 D between second 4 and second 5

Which statement best describes what must happen in order for a person to lift an object?

A The force of gravity must be greater than the mass of the object.B The mass of the object must be greater than the force of gravity.C The force of gravity must be greater than the upward pull or push on the object. D The upward pull or push on the object must be greater than the force of gravity.

This diagram shows a ramp with a toy car at the bottom. A string is attached to the front of the car and the string goes over a pulley at the top of the ramp. A weight is attached to the other end of the string.

What would be most responsible for the toy car being pulled up the ramp? A friction B gravity C kinetic energy D momentum

What increases as a rock falls to the ground?

A the density of the rockB the pull of gravity on the rockC the inertia of the rockD the momentum of the rock

This type of graph is used to describe something about an object.

Seconds

Mete

rs

What could this graph describe? A friction B volume C mass D speed

A student is riding a bike and applies the brakes. Which most helps the bike to stop?

A frictionB gravityC heatD momentum

A car moves along a road that has markers every kilometer. Over time, it passes the markers in shorter periods of time. Which best describes the motion of the car?

A The car is keeping the same direction.B The car is maintaining the same speed.C The car is increasing speed.D The car is changing direction.

An object is moving at a constant speed. If a balanced force is applied in the opposite direction the object is moving, what will most likely happen?

A The object will speed up.B The object will change direction.C The object will continue moving at a constant speed.D The object will slow down and eventually stop moving.

Which best explains why a moving wagon on a sidewalk will slow down?

A The friction between the box and the floor decreases when it is pushed.B The pull of gravity on the box decreases when it is pushed.C Unbalanced forces cause the box to move.D Balanced forces cause the box to move.

A scientist is designing a speedboat to travel through the water with the least amount of resistance. What would the scientist most likely need to consider when designing the boat?

A the length of the boatB the shape of the boatC the power of the boatD the weight of the boat

This diagram shows two boxeshanging over a pulley. The boxes are fastened to the opposite ends of the same piece of rope. The rope does not stretch or break.

Box 21 kg

Box 150 kg

Rope

Pulley What will happen in this situation?A Box 1 will move up, and Box 2 will move down.B Box 1 will move down, and Box 2 will move up.C Both boxes will not move.D Both boxes will move down.

A car is traveling at a speed of45 km/h to a town 90 km away. If time = distance ÷ speed , how long will the car take to get to the town?

A 0.5 hourB 1 hourC 1.5 hoursD 2 hours

When workers spread sand over icy bridges and roads in the winter, how does this help people drive on the roads?

A The sand increases friction between the road and the tires of a car.B The sand increases the inertia of a car.C The sand increases the speed of a car.D The sand increases the momentum of a car.

An object moving along a surface suddenly increases speed. What can cause this to happen?

A It is moved by balanced forces.B It is moved by two opposite forces.C It is moved by an unbalanced force.D It is moved by a force without direction.

Students designed a tool to dig and cut into the soil. Which type of simple machine did they create?

A wheel and axleB inclined planeC pulleyD wedge

This diagram shows a ball rolling down an inclined plane. The position of the ball is labeled for each second it travels.

0 sec 1 sec2 sec

3 sec

Which best describes the motion of the ball? A getting faster each second B getting slower each second C maintaining the same motion D constantly changing direction

A dog runs 6 meters in one second. By the end of the next second, the dog has traveled an additional 4 meters. Which best describes the motion of the dog during the two seconds?

A The dog slows down.B The dog comes to a stop.C The dog changes in mass.D The dog changes direction.

In order for a pulley to work properly, it must be able to overcome which force?

A electricityB gravityC lightD heat

Which best describes how forces must interact for a kite to sail up into the air?

A The force of gravity must be equal to the force of the wind.B The force of gravity must be greater than the force of the wind.C The force of the wind must be greater than the force of gravity.D The force of the person flying the kite must be equal to the force of the wind.

What is the most likely reason cars are designed with smooth surfaces?

A to overcome gravityB to stop easierC to reduce air resistanceD to keep the engine cool

Bill Nye the Science Guy Simple Machines

http://www.youtube.com/watch?v=grWIC9VsFY4&feature=related