Work and Power

Front

What is Work?

Back

Work is defined as the product of the force applied to an object and the distance the object moves in the direction of the force. It is calculated using the formula: 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?

Back

Power is the rate at which work is done or energy is transferred over time. It is calculated using the formula: Power (P) = Work (W) / Time (t). The unit of power is the Watt (W), where 1 Watt = 1 Joule/second.

Front

How do you calculate work done at an angle?

Back

To calculate work done when a force is applied at an angle, use the formula: Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the unit of Work?

Back

The unit of work is the Joule (J). One Joule is defined as the work done when a force of one Newton displaces an object by one meter in the direction of the force.

Front

What is the relationship between Work and Energy?

Back

Work is a transfer of energy. When work is done on an object, energy is transferred to that object, resulting in a change in its energy state.

Front

What is the formula for calculating power?

Back

Power (P) = Work (W) / Time (t). This formula shows how much work is done in a given amount of time.

Front

What is the significance of the angle in work calculations?

Back

The angle affects the amount of work done. If the angle is 0 degrees, all the force contributes to the work done. If the angle is 90 degrees, no work is done because the force is perpendicular to the direction of motion.

Front

How much work is done when lifting an object vertically?

Back

When lifting an object vertically, the work done is calculated as Work (W) = Weight (W) × Height (h). For example, lifting a 5000N block 10m requires 50000J of work.

Front

What is the difference between work done and power?

Back

Work done is the total energy transferred, while power is the rate at which that work is done. Power measures how quickly work is performed.

Front

What is the work done if no movement occurs?

Back

If no movement occurs, the work done is zero, regardless of the force applied. Work requires both force and displacement.