Unit 3 - Work and Power

Front

What is the definition of work in physics?

Back

Work is defined as the product of the force applied to an object and the distance over which that force is applied, in the direction of the force. It is calculated as Work = Force x Distance.

Front

What is power in the context of physics?

Back

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

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 in the direction of the force.

Front

What is the unit of power?

Back

The unit of power is the Watt (W), which is defined as one joule per second (1 W = 1 J/s).

Front

When is work considered to be done?

Back

Work is considered to be done when a force causes a displacement in the direction of the force.

Front

What happens to work done if there is no displacement?

Back

If there is no displacement, then no work is done, regardless of the amount of force applied.

Front

How does the angle between force and displacement affect work?

Back

Work is maximized when the force is applied in the same direction as the displacement. If the angle is 90 degrees, no work is done.

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 that object, increasing its energy.

Front

How do you calculate power if you know work and time?

Back

Power can be calculated using the formula Power = Work / Time.

Front

What is an example of a situation where no work is done despite applying force?

Back

Holding a heavy object stationary requires force, but if there is no displacement, no work is done.