Work done and power

What is work done in physics?

Work done = Force Distance moved in the direction of the force (W = F d).

What is the unit for work done?

Joules (J).

How do you calculate power?

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

What is the unit for power?

Watts (W), where 1 watt = 1 joule per second.

If a force of 10 N is applied to move an object 5 meters, how much work is done?

Work done = 10 N * 5 m = 50 J.

How is power related to energy transfer?

Power is the rate at which energy is transferred or converted.

What is the formula for calculating work done when an object is lifted?

Work done = Force Distance (Force = weight = mass gravitational field strength).

What is meant by efficiency in terms of power?

Efficiency refers to the ratio of useful energy output to total energy input.

How do you calculate the power of an electric heater if it transfers 1000 J of energy in 10 seconds?

Power = 1000 J / 10 s = 100 W.

What happens to power if the time taken to do a task is reduced while keeping work constant?

The power increases.