Work and Power

Front

What is Work in physics?

Back

Work is defined as the product of force and the distance over which it acts. It is calculated using the formula: Work (W) = Force (F) × Distance (d). The unit of work is Joules (J).

Front

What is Power in physics?

Back

Power is the rate at which work is done or energy is transferred. It is calculated using the formula: Power (P) = Work (W) / Time (t). The unit of power is Watts (W).

Front

How do you calculate work done when a force is applied?

Back

Work done can be calculated using the formula: Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the relationship between work and energy?

Back

Work is a transfer of energy. When work is done on an object, energy is transferred to that object, resulting in a change in its energy state.

Front

If a force of 200 N is applied over a distance of 426 m, how much work is done?

Back

Work = Force × Distance = 200 N × 426 m = 85,200 J.

Front

How do you calculate the time taken to do a certain amount of work with a given power?

Back

Time can be calculated using the formula: Time (t) = Work (W) / Power (P).

Front

If 720 Joules of work is done at a power of 90 Watts, how much time is taken?

Back

Time = Work / Power = 720 J / 90 W = 8 s.

Front

What is the formula for calculating power?

Back

Power (P) = Work (W) / Time (t).

Front

If Person A and Person B do the same amount of work but Person A takes less time, who has greater power?

Back

Person A has greater power because power is the rate of doing work.

Front

If 68 Joules of work is done to move a crate with a force of 4 Newtons, how far is the crate moved?

Back

Distance = Work / Force = 68 J / 4 N = 17 m.