Physics Final Exam Review

If a net (unbalanced) force is applied to an object

• the object moves with constant velocity

• the object accelerates

• the object remains stationary

• its impossible to have a net force on an object

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The mass of the object remains the same even if the object is taken to the moon, or Jupiter, or under water.

• True

• False

A 30 Newton force east is applied to a crate and a 10 Newton force west is applied to the same box.  What is the net force on the box?

• 30 N east

• 10 N west

• 20 N east

• 40 N east

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A tennis ball and a solid steel ball of the same size are dropped from the same height.  In the absence of air resistance, which ball has the greater acceleration?

• The steel ball

• The tennis ball

• Neither has any acceleration

• They have the same acceleration

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If a 25 kg box A is placed on a horizontal surface, and an identical box B is placed on a slide which has an angle of 32° from horizontal, how do the normal forces of the boxes compare?

• the normal forces are the same and are both zero

• the normal forces are the same and are non-zero

• the normal force of box A is greater than the normal force of box B

• the normal force of box B is greater than the normal force of box A

If the net force acting on a cart doubles, what happens to the cart’s acceleration?

• it quadruples

• it halves

• it doubles

• it quarters

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 Jane has a mass of 40 kg. She pushes on a 50 kg rock with a force of 100 N. What force does the rock exert on Jane?

• 400 N

• 500 N

• -100 N

• -500 N

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Newton’s second law of motion is represented by:

• a = mg

• F = ma

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Your mass on Earth is 105 kg.  On the imaginary planet Krypton, you weigh 

1175 N.  What is the acceleration of gravity on Krypton?

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Sound waves cannot travel in

• a vacuum

• air

• water

• steel

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