SMS Work and Power (2024-2025)

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 moves an object one meter in the direction of the force.

Front

What is the relationship between force and motion on a frictionless surface?

Back

On a frictionless surface, an object in motion will remain in motion at a constant velocity unless acted upon by an external force. No force is needed to maintain its state of motion.

Front

When does a person do work while lifting an object?

Back

A person does work when lifting an object because they are applying a force to overcome gravity and move the object vertically. Work is done during this lifting process.

Front

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

Back

Distance can be calculated using the formula: Distance (d) = Work (W) / Force (F). This formula rearranges the work equation to solve for distance.

Front

If a student uses a force of 6.8N to move a chair 10m, how much work is done?

Back

Work (W) = Force (F) × Distance (d) = 6.8N × 10m = 68 J.

Front

What happens to the amount of work done if the distance is doubled while applying the same force?

Back

If the distance is doubled while applying the same force, the amount of work done also doubles, since work is directly proportional to distance.

Front

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

Back

The angle (θ) in the work formula indicates the direction of the force relative to the direction of motion. If the force is applied in the same direction as the motion, θ = 0° and cos(θ) = 1, maximizing work done.

Front

What is the difference between work and power?

Back

Work is the total energy transferred by a force over a distance, while power is the rate at which work is done. Power is calculated as Power (P) = Work (W) / Time (t).

Front

What is the unit of power?

Back

The unit of power is the Watt (W), which is defined as one joule of work done per second.