What is the SI unit of work done?

What is the work done on an object if a force of 300N moves it a distance of 8m?

What is the increase in Ep when a mass of 40kg is lifted 8m vertically?

It takes 2 seconds to lift the object in Question 1. What is the power developed?

A boy of mass 40kg runs at a speed of 5m/s. What is his kinetic energy?

When a spring is squashed and released it warms up. Why?

When do objects have momentum?

What is the momentum of a 1000 kg car travelling at 30m/s?

What is the total momentum after an explosion equal to?

Two students on roller skates stand holding each other in the playground. They push each other away.
What can you say about the momentum of each student?

What is impact time?

Why do cars have crumple zones at both the front and the rear?

What happens to a passenger in a head-on collision if they are not wearing a seatbelt?

What happens to a passenger in a head-on collision if they were wearing a very narrow seatbelt?

When is work done by a force?

What is the relationship between work and energy?

What is the unit of power?

What is the decrease in gravitational potential energy when an object of mass 6kg is lowered through a distance of 9m?

What is elastic potential energy?

What is the kinetic energy of a car of mass 1200kg travelling at 30 m/s?

What is the unit of momentum?

What is the momentum of a 2500kg truck travelling at 20m/s?

Why is a gymnast less likely to injure herself if she lands on a thick foam mat than if she lands on a hard floor?

An electric motor is used to raise a 0.1kg mass vertically upwards. If the mass gains 2J of gravitational potential energy, calculate the height it is raised through

A trolley of mass 0.2 kg travelling at 1.5m/s to the right collides with a stationary trolley of mass 0.3kg. After the collusion they move off together. Calculate the velocity of the trolley after the collision