Work and Power

Front

What is the definition of work in physics?

Back

Work is defined as the measure of energy transfer that occurs when an object is moved over a distance by an external force. It is calculated as the product of the force applied and the distance moved in the direction of the force.

Front

What is the formula for calculating work?

Back

The formula for calculating work is: Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is power in the context of physics?

Back

Power is the rate at which work is done or energy is transferred over time.

Front

What is the formula for calculating power?

Back

The formula for calculating power is: Power (P) = Work (W) / Time (t).

Front

What is the unit of power?

Back

The unit of power is the Watt (W), which is equivalent to one Joule per second.

Front

How do you calculate the power output if 150 Joules of work is done in 10 seconds?

Back

Power (P) = Work (W) / Time (t) = 150 J / 10 s = 15 W.

Front

If a force of 200 N is applied to move an object 5 meters, how much work is done?

Back

Work (W) = Force (F) × Distance (d) = 200 N × 5 m = 1000 J.

Front

What is the relationship between work and energy?

Back

Work is a means of transferring energy from one system to another. When work is done on an object, energy is transferred to that object.

Front

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

Back

The angle (θ) in the work formula accounts for the direction of the force relative to the direction of motion. Only the component of the force that acts in the direction of motion does work.

Front

What is the difference between kinetic energy and potential energy?

Back

Kinetic energy is the energy of an object in motion, while potential energy is the stored energy of an object due to its position or state.