Work and Energy

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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. Formula: W = F × d (where W is work, F is force, and d is distance).

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What is Energy?

Back

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

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What is Kinetic Energy?

Back

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

Front

What is Potential Energy?

Back

Potential energy is the energy stored in an object due to its position or configuration. For gravitational potential energy, the formula is PE = mgh (where m is mass, g is acceleration due to gravity, and h is height).

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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: P = W/t (where P is power, W is work, and t is time).

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How does increasing force affect work done?

Back

Increasing the force applied to an object increases the work done, provided the distance remains constant. Work is directly proportional to force.

Front

How does increasing distance affect work done?

Back

Increasing the distance over which a force is applied increases the work done, provided the force remains constant. Work is directly proportional to distance.

Front

What happens to kinetic energy if net work is zero?

Back

If the net work on an object is zero, its kinetic energy remains the same, as there is no change in its motion.

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; if work is done by the object, its energy decreases.

Front

What is the formula for calculating work done against friction?

Back

The work done against friction can be calculated using the formula: W = F_friction × d (where F_friction is the frictional force and d is the distance moved against the friction).