Work & Energy Unit Review

Front

What is work in physics?

Back

Work is defined as the product of force and displacement in the direction of the force. It is calculated using the formula: Work = Force x Distance.

Front

What is kinetic energy?

Back

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

Front

What is gravitational potential energy?

Back

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field. It is calculated using the formula: PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

At which point does a pendulum have the greatest potential energy?

Back

At the highest point of its swing.

Front

At which point does a pendulum have the greatest kinetic energy?

Back

At the lowest point of its swing.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in its energy. If work is done on an object, its energy increases.

Front

What happens to the energy of a pendulum as it swings?

Back

As a pendulum swings, its energy continuously transforms between kinetic and potential energy, but the total mechanical energy remains constant (ignoring air resistance).

Front

If no displacement occurs, what is the work done?

Back

The work done is zero, regardless of the amount of force applied.

Front

What is the formula to calculate force when work and distance are known?

Back

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

Front

What is the significance of the height in gravitational potential energy?

Back

The height determines the amount of gravitational potential energy; the higher the object, the greater the potential energy.