WORK, ENERGY AND POWER

Force applied over a distance in the direction of the force.

What is the definition of work in physics

Positive

When work is done on an object and the force and displacement are in the same direction, what is the work considered?

Holding a heavy object stationary

Which scenario does not involve work being done?

Friction opposing the motion of a sliding object

Which of the following situations represents negative work?

200 J

A force of 50 N moves an object 4 m in the direction of the force. How much work is done?

Negative

If the worker then lowers the block back to the ground, what is the work done by gravity during this process?

259.8 J

An object is pushed with a force of 30 N over a distance of 10 m at an angle of 30 degrees. What is the work done?

It doubles

If you double the distance over which a constant force is applied, what happens to the work done?

Implement a pulley system

To improve energy efficiency in a lifting system, what would be a good modification?

Use a greater force effectively

You are designing a device to lift heavy loads. To maximize work done by the device, you should:

Work can be positive or negative depending on the direction of force and displacement

You design a game where players can either lift or lower objects. How should you explain work to players regarding lifting and lowering objects?