Work and Power Review

Front

What is the equation for power?

Back

P = W/t, where P is power, W is work done, and t is time taken.

Front

What is the unit of power?

Back

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

Front

What is work done?

Back

Work done is defined as the force applied to an object times the distance over which that force is applied, W = F x d.

Front

What is the unit of work?

Back

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

Front

How do you calculate work done when lifting an object?

Back

Work done (W) = mass (m) x gravitational acceleration (g) x height (h), or W = mgh.

Front

What is gravitational acceleration?

Back

Gravitational acceleration (g) is the acceleration due to gravity, approximately 9.81 m/s² on Earth.

Front

If a force of 890 N is applied over a distance of 12 m, what is the work done?

Back

Work done = Force x Distance = 890 N x 12 m = 10680 J.

Front

How do you calculate power output?

Back

Power output (P) = Work done (W) / Time taken (t).

Front

If 10680 J of work is done in 22 seconds, what is the power output?

Back

Power output = 10680 J / 22 s = 485.45 W.

Front

What is the relationship between work, power, and time?

Back

Power is the rate at which work is done; it is calculated as work divided by time.