1 Which two graphs represent the motion of an object on which the net force is zero?

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2 The table below lists the coefficients of kinetic friction for four materials sliding over steel.

A 10.-kilogram block of each of these materials is pulled horizontally across a  steel floor at constant velocity. Which block requires the smallest applied force  to keep it moving at constant velocity?

(1) aluminum     (3) copper
(2) brass            (4) steel

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3 The magnitude of the force that a baseball bat exerts on a ball is 50. newtons. The magnitude of the force that the ball exerts on the bat is

(1) 5.0 N      (3) 50. N
(2) 10. N      (4) 250 N

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4 A bullet traveling at 5.0 × 102 meters per second is brought to rest by an impulse of 50. newton•seconds. What is the mass of the bullet?

(1) 1.0 × 10–2 kg      (3) 1.0 × 101 kg
(2) 1.0 × 10–1 kg      (4) 2.5 × 104 kg

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5 Which graph best represents the relationship between acceleration due to gravity and mass for objects near the surface of Earth? [Neglect air resistance.]

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