PHYS - Questions on Momentum
Physics, momentum - IBDP | DSE | GCE | IAL | AP Physics
Concepts you need to remember for IGCSE Physics:
A raindrop of mass 0.000035kg falls to the group. The speed of the raindrop as it hits the ground is 8.8m/s. Calculate the momentum of the raindrop as it hits the ground.
momentum = 0.000035 x 8.8 = 3.08 x 10-4 kg·m/s
A boy of mass 43.2kg runs and jumps onto a stationary skateboard. The boy lands on the skateboard with a horizontal velocity of 4.10m/s. The skateboard has a mass of 2.50kg. Using ideas about conservation of momentum, calculate the combined velocity of the boy and skateboard just after the boy lands on it
The boy holds a heavy ball as he stands on a stationary skateboard. The boy throws the ball forwards while still standing on the skateboard. Explain what happens to the boy and the skateboard.
A car travels at 20m/s. The mass of the car is 1500kg.
(a) Calculate the momentum of the car.
momentum = 1500 x 20 = 3.0 x 104 kg·m/s
(b) The car crashes into a wall and stops in 0.14s. Calculate the average force on the car during the crash.
force = 3.0 x 104 / 0.14 = 2.1 x 105 N
An ice skater wears soft knee pads that compress easily. Explain how the pads protect her knees when she falls on the ice.
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