Work & Energy — Set 5

A motor does 1200 J of work in 2 s. What is its power?

If friction force f acts over displacement s opposite to motion, the work done by friction is?

Mechanical energy of a body is the sum of?

Kinetic energy increases with speed according to?

A force of 50 N acts on a body causing a displacement of 4 m at 30° to the displacement. What is the work done? (cos 30° ≈ 0.866)?

When a body falls freely downward (ignoring air resistance), its gravitational potential energy mainly converts into?

Work done in lifting a body slowly through height h against gravity is equal to?

If a force acts parallel to the velocity of a body, instantaneous power can be written as?

A pump lifts water with force 1000 N at a speed of 2 m/s vertically. What power is required?

1 watt is equal to?