Work & Power Flashcard

Front

What is the definition of work in physics?

Back

Work is defined as the force exerted on an object multiplied by the distance the object moves in the direction of the force. It is measured in joules (J).

Front

What is the formula for calculating work?

Back

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

Front

What unit is work measured in?

Back

Work is measured in joules (J).

Front

What is power in the context of physics?

Back

Power is the rate at which work is done or energy is transferred. It is measured in watts (W).

Front

What is the formula for calculating power?

Back

Power (P) = Work (W) / Time (t).

Front

If a girl runs up a flight of stairs and does 500 J of work in 4 seconds, what is her power?

Back

Power = 500 J / 4 s = 125 W.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in energy. Energy can be transferred or transformed but cannot be created or destroyed.

Front

What is an example of work being done?

Back

A student carries his chair into another room, as he exerts a force and moves the chair a distance.

Front

What is an example of no work being done?

Back

A student pushes against a locked door that does not move; no distance is covered.

Front

How much work is done when lifting a 500 N block to a height of 10 m?

Back

Work = Force × Distance = 500 N × 10 m = 5000 J.