Work Practice Flashcard

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 using the formula: Work = Force x Distance x cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the unit of work?

Back

The unit of work is the Joule (J), which is defined as one Newton meter (1 J = 1 N·m).

Front

If no movement occurs, what is the work done?

Back

If no movement occurs, the work done is 0 Joules (0 J), regardless of the force applied.

Front

What is the formula to calculate work done when a force is applied at an angle?

Back

The formula to calculate work done when a force is applied at an angle is: Work = Force x Distance x cos(θ), where θ is the angle between the force and the direction of motion.

Front

What does a negative work value indicate?

Back

A negative work value indicates that the force applied is in the opposite direction to the motion of the object, such as friction slowing down a moving object.

Front

What is the relationship between force, distance, and work?

Back

Work is directly proportional to both the force applied and the distance over which the force is applied. If either force or distance increases, the work done increases.

Front

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

Back

The angle in the work formula determines how much of the applied force contributes to the work done in the direction of motion. A smaller angle means more effective work.

Front

How much work is done if a force is applied perpendicular to the direction of motion?

Back

If a force is applied perpendicular to the direction of motion, no work is done (0 J), because the angle θ is 90 degrees and cos(90°) = 0.

Front

What is the work done by friction on a moving object?

Back

The work done by friction on a moving object is negative, as friction opposes the motion, reducing the object's kinetic energy.

Front

What is the condition for work to be done?

Back

For work to be done, a force must be applied, and there must be movement in the direction of the force.