impulse with calculation

impulse with calculation

By Matthew Everest

Multiple Choice

Practice: A 50g ball hits a wall at 10 m/s and bounces off in the opposite direction at 10 m/s. What is the change in momentum of the ball during the collision? $$\Delta$$  p = mv_f - mv_i

• 0.5kg.m/s

• -1 kg.m/s

• 0kg.m/s

• none of these

Multiple Choice

Why do we feel less pain when we fall on a soft floor instead of a road?

• soft things give shorter contact time so peak force goes down

• soft things give longer contact time so peak force goes down

• soft things give longer contact time so peak force goes up

• soft things give shorter contact time so peak force goes up

Multiple Choice

A 780kg helicopter accelerates up from 5m/s to 15m/s. How much time does it take if the net average force upwards is 2000N?

• 1.9s

• 2.9s

• 3.9s

• 4.9s

Multiple Choice

Find the impulse of a toy car with this force function F(t) = t² + 2 t – t + 9  from rest at time 0 to 7 seconds.

• 101N.s

• 202N.s

• 303N.s

• 404N.s

Multiple Choice

Find the change in velocity of a 201g hockey puck with the force applied as per the graph in the image

• 18.5

• 19.5

• 20.5

• 21.5