Unit 4 - 4.1 Work

Front

What is Work in physics?

Back

Work (W) is defined as the transfer of energy from one object to another through a mechanical process, calculated as W = F ⋅ d ⋅ cos Θ, where F is the force applied, d is the distance moved, and Θ is the angle between the force and the direction of motion.

Front

What is the formula for calculating Work?

Back

W = F ⋅ d ⋅ cos Θ

Front

In which situation is work not done?

Back

Holding a 20 pound box above the floor.

Front

Can work be done on a system if there is no motion?

Back

No, since a system that is not moving has no change in energy.

Front

What is the unit of Work?

Back

Joule (J)

Front

What does a positive work value indicate?

Back

Positive work indicates that energy is being transferred to the system, causing it to gain energy.

Front

What does a negative work value indicate?

Back

Negative work indicates that energy is being taken away from the system, causing it to lose energy.

Front

What is the work done by friction when a skier slides down an incline?

Back

Negative work.

Front

What is the relationship between force and work?

Back

Work is done when a force causes an object to move. The amount of work depends on the magnitude of the force, the distance moved, and the angle of the force.

Front

What is the significance of the angle in the work formula?

Back

The angle (Θ) determines how much of the force contributes to the work done; only the component of the force in the direction of motion does work.