Question

Problem 1

A 0.150 kg baseball pitched at 40.0 m/s is hit on a horizontal line drive straight back at the pitcher at 50.0 m/s.

a) If the contact time between bat and ball is 3.90×10⁻³ s, calculate the magnitude of the force (assumed to be constant) between the ball and bat.

b) Determine the direction of the force exerted on a ball.

Problem 2

Indicate whether the following statements are true for both inelastic collisions and elastic collisions.

a) Momentum and kinetic energy are conserved.

b) Momentum is conserved.

c) Momentum and potential energy are conserved.

d) Kinetic energy is conserved.

Problem 3

Explain how it is possible for an object to receive a larger impulse from a small force than from a large force?

Problem 4

When a person jumps from a tree to the ground, what happens to the momentum of the person upon striking the ground?

a) remains the same

b) becomes zero

c) increases in magnitude

d) decreases in magnitude (not to zero)

e) its direction reverses

Answer 1