Work, Energy and Power Review

Front

What is the definition of work in physics?

Back

Work is defined as the product of force and displacement in the direction of the force. It is calculated using the formula: Work = Force x Distance x cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the formula for calculating power?

Back

Power is defined as the rate at which work is done. It is calculated using the formula: Power = Work / Time.

Front

How do you calculate kinetic energy?

Back

Kinetic energy (KE) is calculated using the formula: KE = 1/2 mv², where m is mass and v is velocity.

Front

What is gravitational potential energy?

Back

Gravitational potential energy (PE) is the energy an object possesses due to its position in a gravitational field, calculated using the formula: PE = mgh, where m is mass, g is the 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 energy. When work is done on an object, energy is transferred to it, increasing its kinetic or potential energy.

Front

What is the difference between positive work and negative work?

Back

Positive work occurs when the force and displacement are in the same direction, while negative work occurs when the force and displacement are in opposite directions.

Front

What is the total mechanical energy of an object?

Back

Total mechanical energy is the sum of an object's kinetic energy and potential energy. It is conserved in a closed system without external forces.

Front

How does time affect power?

Back

Power is inversely related to time; the longer it takes to do the same amount of work, the less power is produced.

Front

What happens to kinetic energy when speed is doubled?

Back

If the speed of an object is doubled, its kinetic energy increases by a factor of four, since KE = 1/2 mv².

Front

What is the unit of work in the International System of Units (SI)?

Back

The unit of work is the Joule (J), which is defined as one Newton meter (1 J = 1 N·m).