Physics 11 - Impulse and Momentum

p.193 - 1.Jenny has a mass of 35.6kg and her skateboard a mass of 1.3kg. What is the momentum of jenny and her skateboard together if they are going 9.50m/s?

You first have to add the masses together to get the total mass, then multiply it by the velocity.

p. 194 - 16) A 95kg fullback, running at 8.2m/s, collides in midair with a 128kg defensive tackle moving in the opposite direction. Both players end with 0 speed.

a) What was the fullback’s momentum before the collision?

The fullback's momentum before the collision is calculated by multiplying his mass by his velocity, resulting in 779 kg·m/s.

b) what was the change in the fullback’s momentum?

The change in the fullback's momentum is equal to his initial momentum since he comes to a stop, ending up with a change of -7.8 × 10² kg·m/s.

c) what was the change in the tackle’s momentum?

The tackle’s change in momentum is P2 and it is equal to -change in P1 so the tackle’s momentum change is +7.8 × 10² kg·m/s.

What is the momentum of a 100 kg motorbike travelling at 10m/s?

p = mv

p = 100 kg * 10 m/s

p = +1.0 × 10³ kg * m/s