Work, Energy and Power Review

Front

What is kinetic energy?

Back

Kinetic energy is the energy an object possesses due to its motion, calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.

Front

How do you calculate the speed of an object given its kinetic energy and mass?

Back

Use the formula v = sqrt(2KE/m), where KE is kinetic energy and m is mass.

Front

What is gravitational potential energy?

Back

Gravitational potential energy is the energy an object possesses due to its height above the ground, calculated using the formula PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What factors affect gravitational potential energy?

Back

Gravitational potential energy depends on the object's mass, the height above the ground, and the acceleration due to gravity.

Front

What is the work-energy principle?

Back

The work-energy principle states that the work done on an object is equal to the change in its kinetic energy.

Front

How is work calculated?

Back

Work is calculated using the formula W = Fd, where W is work, F is force, and d is the distance over which the force is applied.

Front

What is the relationship between work and energy?

Back

Work is a transfer of energy; when work is done on an object, energy is transferred to or from that object.

Front

What happens to kinetic energy when speed decreases?

Back

Kinetic energy decreases when speed decreases, as it is proportional to the square of the speed.

Front

If an object's speed is halved, how does its kinetic energy change?

Back

If an object's speed is halved, its kinetic energy becomes one-fourth of its original value.

Front

What is the formula for calculating work done by gravity?

Back

The work done by gravity can be calculated as W = -ΔPE, where ΔPE is the change in potential energy.