Work, Energy and Power
GCE Physics

a) State the work-energy theorem. (2 marks) b) A body of mass 5 kg is pulled from rest along a smooth horizontal surface by a constant horizontal force of 20 N. After travelling a distance of 8 m, th…

a) i) Define power as used in Physics. (1 mark) ii) Write down the SI unit of power and express it in base units. (2 marks) b) A pump is used to raise water from a well 15 m deep and discharge…

A stone of mass 2 kg is thrown vertically upward with an initial kinetic energy of 180 J. Taking g = 10 m/s², what is the maximum height reached by the stone?

An electric motor of efficiency 80% is used to lift a load of 500 N through a height of 6 m in 10 seconds. What is the power input to the motor?

A body of mass 4 kg moving with a velocity of 6 m/s collides with a stationary body of mass 2 kg and they move together after the collision. What is the kinetic energy lost during the collision?

Which of the following is the correct SI unit of power?

A pump raises 500 kg of water through a vertical height of 12 m every minute. Taking g = 10 m/s², what is the minimum power of the pump?

A car of mass 1000 kg accelerates uniformly from rest to a speed of 20 m/s. If the engine exerts a constant net force of 2000 N, what is the distance covered during this acceleration?

A body is released from rest at the top of a frictionless inclined plane of height 5 m. Taking g = 10 m/s², what is the speed of the body at the bottom of the incline?

Which of the following statements correctly describes the work-energy theorem?

A force of 50 N acts on an object and moves it through a distance of 8 m in the direction of the force. What is the work done by the force?