Work and Energy 2023-24

Front

What is the definition of 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 stored energy based on an object's position or state, commonly gravitational potential energy, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What happens to mechanical energy in the absence of friction?

Back

In the absence of friction or external forces, the total mechanical energy of a system remains constant.

Front

How does friction affect kinetic energy?

Back

Friction converts kinetic energy into thermal energy, causing a decrease in the kinetic energy of the moving object.

Front

What is the principle of conservation of energy?

Back

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

Front

What is the relationship between work and energy?

Back

Work is done when a force causes an object to move, and it results in a change in energy. Work done = change in energy.

Front

What is thermal energy?

Back

Thermal energy is the energy that comes from the temperature of matter, resulting from the kinetic energy of its particles.

Front

What is the formula for calculating work done?

Back

Work done (W) is calculated as W = Fd cos(θ), where F is the force applied, d is the distance moved, and θ is the angle between the force and the direction of motion.

Front

What is the effect of height on potential energy?

Back

Potential energy increases with height; the higher an object is, the more gravitational potential energy it has.

Front

What is the difference between kinetic and potential energy?

Back

Kinetic energy is energy of motion, while potential energy is stored energy based on position.