Work & Energy Review

Front

What is the formula for calculating gravitational potential energy (PE)?

Back

PE = mgh, where m is mass (kg), g is acceleration due to gravity (9.81 m/s²), and h is height (m).

Front

How do you calculate work (W) done when lifting an object?

Back

W = Fd, where F is the force applied (N) and d is the distance moved in the direction of the force (m).

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in energy, either kinetic or potential.

Front

Define kinetic energy (KE).

Back

KE is the energy of an object due to its motion, calculated as KE = 1/2 mv², where m is mass (kg) and v is velocity (m/s).

Front

What is the principle of conservation of energy?

Back

Energy cannot be created or destroyed, only transformed from one form to another.

Front

How is power defined in physics?

Back

Power is the rate at which work is done, calculated as P = W/t, where W is work (J) and t is time (s).

Front

If two people perform the same amount of work, how does the time taken affect their power output?

Back

The person who takes less time to do the same work has a higher power output.

Front

What is the formula to calculate the speed of an object just before it hits the ground when falling from a height?

Back

v = √(2gh), where g is acceleration due to gravity (9.81 m/s²) and h is the height (m).

Front

What is the unit of work in the International System of Units (SI)?

Back

The unit of work is the Joule (J).

Front

How do you calculate the change in kinetic energy?

Back

Change in KE = KE_final - KE_initial.