Work

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 (W) = Force (F) × Distance (d) × 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 the amount of work done when a force of one newton displaces an object by one meter in the direction of the force.

Front

If a force is applied but there is no movement, is work done?

Back

No, work is not done if there is no movement. Work requires both a force and displacement in the direction of that force.

Front

How do you calculate the distance moved if work and force are known?

Back

Distance can be calculated using the formula: Distance (d) = Work (W) / Force (F).

Front

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

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 work done when a force of 200 N is applied over a distance of 426 m?

Back

Work = Force × Distance = 200 N × 426 m = 85,200 J.

Front

Is work done when a weightlifter holds a barbell still above his head?

Back

No, work is not done in this case because there is no displacement of the barbell.

Front

If 150 Joules of work is needed to move a box 10 meters, what is the force used?

Back

Force = Work / Distance = 150 J / 10 m = 15 N.

Front

What is the formula for calculating work?

Back

The formula for calculating work is: Work (W) = Force (F) × Distance (d) × cos(θ).

Front

What happens to the work done if the angle between the force and the direction of motion is 90 degrees?

Back

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