Newton’s laws and momentum

Question 1

What is Newton’s first law?

Answer 1

An object will remain in a state of rest or constant velocity unless acted upon by an external force

Question 2

What is Newton’s second law?

Answer 2

The net force acting on an object is proportional to the rate of change of momentum and is in the same direction. F=changep/changet when mass isn’t constant, when it is we use ma

Question 3

What is Newton’s third law?

Answer 3

When two objects interact they exert equal and opposite forces to each other

Question 4

Impulse

Answer 4

The average net force acting on an object multiplied by the time it acts on it, comes from Newton’s second law, F=delta p/delta t, F times t is the impulse or change in momentum

Question 5

How can you find impulse on a force-time graph?

Answer 5

The area underneath the graph

Question 6

What happens in a perfectly elastic collision?

Answer 6

Momentum and kinetic energy is conserved, two objects are not colliding or bouncing off each other

Question 7

What happens in inelastic collision?

Answer 7

Momentum is conserved but KE is not, two things colliding

Question 8

Is momentum before equal to momentum after?

Answer 8

Yes