3.4 Force and momentum

Question 1

What is the equation for momentum?

Answer 1

p = mv

Question 2

Define momentum

Answer 2

The momentum is an objects mass times its velocity

Question 3

Define the impulse of a force

Answer 3

The force times the time that the force acts for. Therefore the impulse is the change in momentum of an object

Question 4

What are the units for momentum?

Answer 4

kgm/s

Question 5

How do you calculate the force of an impact?

Answer 5

Change in momentum/change in time, mv-mu/t

Question 6

What rule do we use in momentum interactions and what equation goes with it for 2 objects?

Answer 6

Initial momentum = Final momentum

m1v1 + m2v2 = m1u1 + m2u2

Question 7

What is an elastic collision?

Answer 7

A reaction where kinetic energy is conserved

Question 8

Why would an inelastic reaction occur?

Answer 8

Because some of the kinetic energy before the collision has deformed one of the objects

Question 9

When would an inelastic collision occur?

Answer 9

When 2 objects stick together after a collision

Question 10

What is the units of an impulse?

Answer 10

Newton seconds, Ns

Question 11

What equation links momentum and force?

Answer 11

Force = change in momentum/change in time