Chapter 7- Laws Of Motion and Momentum

Question 1

What is the principle of conservation of momentum?

Answer 1

The total momentum in a specified direction remains constant, as long as no external force acts on the system.
“So momentum before a collision is equal to momentum after a collision”

Question 2

What’s the equation for momentum?

Answer 2

Momentum= mass x velocity

Question 3

What are the SI units for momentum ?

Answer 3

Kg ms^-1

Question 4

What is the difference between a perfectly elastic collision and an inelastic collision?

Answer 4

An elastic Collin conserves total kinetic energy, no energy is lost in the collision as such.

Question 5

What is conserved in an inelastic collision?

Answer 5

Momentum and total energy.

NOT TOTAL KINETIC ENERGY

Question 6

What is Newtons 2nd law?

Answer 6

The resultant force acting on an object is directly proportional to the rate of change of momentum.

Question 7

What is impulse

Answer 7

Impulse is change in momentum, it come from Newtons 2nd Law F= change p/ change t but rearranged as F x change t = change p.

Question 8

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

Answer 8

Area under graph is equal to the impulse or change in momentum