Work and Power REVIEW

Front

What is work in physics?

Back

Work is defined as the product of the force applied to an object and the displacement of that object in the direction of the force. It is calculated using the formula: Work = Force × Displacement.

Front

What is the unit of work?

Back

The unit of work is the joule (J), which is defined as the amount of work done when a force of one newton displaces an object by one meter.

Front

What is power in physics?

Back

Power is the rate at which work is done or energy is transferred over time. It is calculated using the formula: Power = Work / Time.

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

If a force and displacement are in the same direction, what is the sign of the work done?

Back

The work done is positive.

Front

How do you calculate the displacement if you know the work done and the force applied?

Back

Displacement can be calculated using the formula: Displacement = Work / Force.

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 formula for calculating power when work and time are known?

Back

Power = Work / Time.

Front

If an object does 900 J of work in 15 seconds, what is its power output?

Back

Power = 900 J / 15 s = 60 W.

Front

What is the mass of an object if it does 1520 J of work over a distance of 8 meters?

Back

Using the formula Work = Force × Displacement and knowing that Force = Mass × Gravity, we can find the mass. The mass is approximately 19 kg.