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A 95-kg fullback, running at 8.2 m/s, collides in midair with a 128-kg defensive tackle moving in the opposite direction. Both players end up with zero speed.
What was the fullback's momentum before the collision?
What was the change in the fullback's momentum?
What was the change in the tackle's momentum?
What was the tackle's original momentum?
How fast was the tackle moving originally?
The fullback's momentum can be calculated using p = m × v. The momentum is 95 kg × 8.2 m/s = 779 kg·m/s.
What is the total momentum of Jenny and her skateboard moving at 9.50 m/s?
Calculate using p = mv. The combined mass is 35.6 kg + 1.3 kg = 36.9 kg, so the momentum is 36.9 kg • 9.50 m/s = 350.55 kg·m/s.
A hockey player makes a slap shot, exerting a force of 30.0 N on the hockey puck for 0.16s. What impulse is given to the puck?
Impulse can be calculated using the formula p = f•t. Impulse = 30.0 N • 0.16 s = 4.8 Ns.
The hockey puck shot has a mass of 0.115 kg and was at rest before the shot. With what speed does it head toward the goal?
Using P=F•t, we then solve for final v, Vf=F•t/m, with those values, plug them into the formula to get the speed.
