Ch 9: Momentum

Question 1

What are the units of momentum?

Answer 1

Newton•second

which is the same as a….. kg•m/s

Question 2

A collision is a short-________ interaction between two objects. The duration of a collision depends on the _______ from which the objects are made. The harder the objects, the shorter the contact time. think pool balls versus a foot and a soccer ball.

Answer 2

duration

materials

Question 3

A soccer ball is _______, and when you compress it, it exerts a restoring force equal to the force of the foot on the ball. Greater compression implies a greater force, just as for a ______.

Answer 3

elastic
spring

p. 279

Question 4

The effect of an impulsive force (J) is proportional to the area under the _____-versus-time curve.

Answer 4

force

p. 279

Question 5

Is impulse a scalar or vector quantity?

Answer 5

vector

Question 6

An elastic collision is a collision in which there is no net loss in _______ energy in the system as a result of the collision. Both momentum and kinetic energy are conserved quantities in elastic collisions.

Answer 6

kinetic