Chapter 11: Momentum

Question 1

What is momentum?

Answer 1

The product of an object’s mass and velocity

Question 2

What is the law of conservation of momentum?

Answer 2

In a closed system where no external forces act on the system, momentum stays the same

Question 3

What is impulse?

Answer 3

The change in an object’s momentum when a force acts on it

Question 4

What is the equation for impulse?

Answer 4

Impulse= F x t (Ns)
F x deltaT = delta(mv)
Change in momentum

Question 5

Linear momentum

Answer 5

Momentum in one dimension, eg a collision or explosion in a straight line

Question 6

What does the area under a force-time graph show?

Answer 6

Change in momentum

Question 7

What are some safety features of cars that increase time over which momentum changes?

Answer 7

Seat belts, crumple zones, air bags, etc.

Question 8

What is an elastic collision?

Answer 8

A collision in which kinetic energy is conserved (mostly atomic scale)

Question 9

What is an inelastic collision?

Answer 9

A collision in which kinetic energy is not conserved (transferred to heat, work done on car, etc.) (mostly large scale)