Energy, Work and Power

Front

What is the formula for calculating work?

Back

Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

Define kinetic energy.

Back

Kinetic energy is the energy an object possesses due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or configuration, commonly calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

How does the speed of an object affect its kinetic energy?

Back

The kinetic energy of an object increases with the square of its speed; as speed doubles, kinetic energy increases by a factor of four.

Front

What is the unit of work in the International System of Units (SI)?

Back

The unit of work is the Joule (J).

Front

If a 2 N force moves an object 4 m, how much work is done?

Back

Work done = 2 N × 4 m = 8 J.

Front

What happens to potential energy as an object falls?

Back

As an object falls, its potential energy decreases while its kinetic energy increases, conserving total mechanical energy.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in its energy; work can transfer energy to or from an object.

Front

Define power in terms of work and time.

Back

Power is the rate at which work is done, calculated as Power (P) = Work (W) / Time (t).

Front

What is the formula for gravitational potential energy?

Back

Gravitational potential energy (PE) = mgh, where m is mass, g is the acceleration due to gravity, and h is height.