Energy- Physics

Front

What is work in physics?

Back

Work is defined as a force acting over a distance to cause a change in energy.

Front

What is the formula for calculating work?

Back

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

Front

What is kinetic energy?

Back

Kinetic energy is the energy of motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

How do you calculate the change in kinetic energy?

Back

Change in Kinetic Energy = KE_final - KE_initial.

Front

What is potential energy?

Back

Potential energy is the stored energy of an object due to its position or state, commonly gravitational potential energy, calculated as PE = mgh.

Front

What is the principle of conservation of energy?

Back

The principle states that energy cannot be created or destroyed, only transformed from one form to another.

Front

What is efficiency in terms of energy use?

Back

Efficiency is the ratio of useful energy output to total energy input, expressed as a percentage.

Front

How do you calculate efficiency?

Back

Efficiency (%) = (Useful Energy Output / Total Energy Input) x 100.

Front

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

Back

The unit of work is the Joule (J).

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in its energy.