Work

Work done = Force x Distance
Force = weight = mass x g = 0.5 kg x 10 N/kg = 5 N
Work done = 5 N x 1.2 m = 6.0 J
Answer: 6.0 J. The work done by the motor is equal to the energy transferred to the mass (gravitational potential energy).

The work done by the engine is equal to the energy transferred to the car. This energy transfer primarily increases the kinetic energy of the car, causing it to accelerate. Some of the energy transferred may also be converted into thermal energy due to friction within the engine and air resistance.

Formula: Work Done (W) = Force (F) × Distance (d)
Working:
W = 52 N × 1.2 m
W = 62.4 J
Answer: The work done is 62.4 J. Work done is the energy transferred when a force causes displacement.

Work is done when a force causes a displacement. In this case, the crane exerts a force upwards on the metal block, and the block moves upwards. Because there is a force and a displacement in the same direction, work is done *on* the block by the crane. The energy is transferred from the crane (reducing its energy) to the block (increasing its gravitational potential energy).