_13) Energy, 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, measured in joules (J). Formula: Work = Force x Distance.

Front

What is the formula for calculating power?

Back

Power is defined as the rate at which work is done. Formula: Power = Work / Time, measured in watts (W).

Front

What is the unit of work?

Back

The unit of work is the joule (J).

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or height. It is calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object in motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

How does mass affect potential energy?

Back

Potential energy increases with mass; the greater the mass of an object, the more potential energy it has at a given height.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in energy. If work is done on an object, its energy increases.

Front

What is the difference between work and energy?

Back

Work is the process of energy transfer, while energy is the capacity to do work.

Front

What is the gravitational potential energy of an object at a height of 10 m with a mass of 2 kg?

Back

PE = mgh = 2 kg * 9.81 m/s² * 10 m = 196.2 J.

Front

What is the significance of the unit 'watt'?

Back

A watt (W) is a unit of power, equivalent to one joule per second (1 W = 1 J/s).