Work, Power, and Energy (Physical Science)

Front

What is work in physics?

Back

Work is defined as the transfer of energy that occurs when a force is applied to an object and the object moves in the direction of the force.

Front

Is lifting a heavy box off the ground considered work?

Back

Yes, lifting a heavy box off the ground is considered work because a force is applied and the box moves.

Front

Which of the following is NOT considered work: Holding a bar above your head or lifting it?

Back

Holding the bar above your head is NOT considered work because there is no movement in the direction of the force.

Front

What is energy?

Back

Energy is the ability to do work.

Front

Which of the following is NOT a fossil fuel: Coal, Uranium, Oil, Natural Gas?

Back

Uranium is NOT a fossil fuel.

Front

How do you calculate work?

Back

Work is calculated using the formula: Work (W) = Force (F) x Distance (d) x cos(θ), where θ is the angle between the force and the direction of motion.

Front

If a worker moves a load of bricks weighing 680 N a distance of 15 m, how much work is done?

Back

The work done is 10,200 J (calculated as 680 N x 15 m).

Front

What is power in physics?

Back

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

Front

How is power calculated?

Back

Power (P) is calculated using the formula: Power (P) = Work (W) / Time (t).

Front

What is the unit of work?

Back

The unit of work is the Joule (J).