Work, Power and Energy

Front

What is Work in physics?

Back

Work is defined as the product of the force applied to an object and the distance over which that force is applied, in the direction of the force. It is measured in joules (J).

Front

What is Power in physics?

Back

Power is the rate at which work is done or energy is transferred. It is measured in watts (W), where 1 watt equals 1 joule per second.

Front

What is Energy?

Back

Energy is the capacity to do work. It exists in various forms, such as kinetic energy, potential energy, thermal energy, etc.

Front

How is Work calculated?

Back

Work (W) is calculated using the formula: W = F × d × cos(θ), where F is the force applied, d is the distance moved, and θ is the angle between the force and the direction of motion.

Front

What is the formula for calculating Power?

Back

Power (P) is calculated using the formula: P = W / t, where W is the work done and t is the time taken.

Front

What is Kinetic Energy?

Back

Kinetic Energy (KE) is the energy possessed by an object due to its motion, calculated using the formula: KE = 1/2 mv², where m is mass and v is velocity.

Front

What is Potential Energy?

Back

Potential Energy (PE) is the energy stored in an object due to its position or configuration, commonly calculated using the formula: PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is the relationship between Work and Energy?

Back

Work done on an object results in a change in its energy. If work is done on an object, its energy increases, and if work is done by the object, its energy decreases.

Front

What is the significance of the angle in the Work formula?

Back

The angle (θ) in the Work formula determines how much of the force contributes to the work done. If θ is 0 degrees, all the force contributes to work; if θ is 90 degrees, no work is done.

Front

What happens to Work if there is no movement?

Back

If there is no movement (displacement), then no work is done, regardless of the force applied.