Work, Energy, and Power

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 the unit of Energy?

Back

The unit of energy 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 measured in Watts (W), where 1 Watt = 1 Joule/second.

Front

What is the Law of Conservation of Energy?

Back

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed from one form to another.

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What is Kinetic Energy?

Back

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

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What is Potential Energy?

Back

Potential Energy is the stored energy of an object due to its position or state, commonly gravitational potential energy, calculated using PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What happens to mechanical energy in the presence of friction?

Back

In the presence of friction, mechanical energy is converted into thermal energy, leading to a decrease in the total mechanical energy of the system.

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How does the height of an object affect its potential energy?

Back

The potential energy of an object increases with height; the higher the object, the greater its potential energy.

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?

Back

The formula for calculating work is W = Fd cos(θ), where W is work, F is the force applied, d is the distance moved, and θ is the angle between the force and the direction of motion.