Work and Power

Front

What is 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 × Distance × 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

What is power in physics?

Back

Power is the rate at which work is done or energy is transferred over time. It is calculated using the formula: Power = Work / Time.

Front

What is the unit of power?

Back

The unit of power is the Watt (W), which is defined as one Joule per second (1 W = 1 J/s).

Front

What happens to work done when the force and displacement are in opposite directions?

Back

When the force and displacement are in opposite directions, negative work is done, indicating that the force is acting against the motion of the object.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in its energy. Specifically, work can increase the kinetic energy of an object or change its potential energy.

Front

If no displacement occurs, what can be said about the work done?

Back

If there is no displacement, then no work is done, regardless of the amount of force applied.

Front

What is the formula for calculating gravitational potential energy?

Back

Gravitational potential energy (PE) is calculated using the formula: PE = mass × gravity × height (PE = mgh).

Front

How does the angle between force and displacement affect work done?

Back

The angle affects work done because only the component of the force in the direction of displacement contributes to work. If the angle is 90 degrees, no work is done.

Front

What is the significance of a force applied perpendicular to the direction of motion?

Back

When a force is applied perpendicular to the direction of motion, no work is done because the displacement does not occur in the direction of the force.