Physics Test Review

A car and a 18-wheeler run out of gas and are pushed to the side of the road. Which is easier to push, and why?

• the 18-wheeler, because it has more mass and therefore more inertia
• the 18-wheeler, because it has less mass and therefore less inertia
• the car, because it has more mass and therefore more inertia
• the car, because it has less mass and therefore less inertia

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According to Newton’s first law of motion, what will an object in motion do when no external force acts on it?

• come to a stop
• move at the same velocity
• speed up
• change direction

Newton’s third law of motion says that for every action there is a(n) _____________ and opposite reaction.

• greater
• lesser
• equal
• maximum

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The normal force is the ____ force exerted by a surface on another object

• perpendicular field
• parallel contact
• perpendicular contact
• parallel field

The acceleration due to gravity on Earth is 9.8 m/s2. What is the weight of a 75 kg person on Earth?

• 9.8 N
• 75 N
• 85 N
• 735 N

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A car manufacturer wants to change its car’s design to increase the car’s acceleration. Which changes should the engineers consider making to the design?

• decrease the force that the engine provides
• increase the mass of the car
• decrease the mass of the car
• increase the top velocity the car can travel

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What is the acceleration along the ground of a 10 kg wagon when it is pulled with a force of 44 N?

• 0.22 m/s2

• 2.0 m/s2

• 4.4 m/s2

• 440 m/s2

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A puppy finds a rawhide bone and begins to pull it with a force, Ft. The free-body diagram is shown. Which describes what happens to the bone?

• It begins to move toward the right with a net force of 2 N.
• It begins to move to the right with a net force of 10 N.
• It begins to move toward the left with a net force of -4 N.
• It begins to move to the left with a net force of -2 N.

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A skateboarder is trying a new stunt.  He stands on his skateboard which is at rest on top of a large rectangular box.  The skateboarder stands still and his friend pulls a rope attached to the box to roll the box out from under the skateboarder.  If Newton's first law comes into effect in this scenario, what will happen to the skateboard?

• It will roll forward away from the box
• It will stay in place and the skateboarder will touch the ground close to where he was to start
• It will roll backwards as the friend pulls the box out from under him
• It will roll forward, but stay on the box as the friend pulls it away.

A rocket experiences a constant force even as the amount of fuel in its fuel tanks decreases. What happens to the acceleration of the rocket as it runs out of fuel?

• The acceleration decreases because the mass increases.
• The acceleration increases because the mass increases.
• The acceleration decreases because the mass decreases.
• The acceleration increases because the mass decreases.

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