Conservation of Energy

Front

What is the Law of Conservation of Energy?

Back

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed from one form to another.

Front

Define gravitational potential energy.

Back

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field, typically calculated as PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

What is kinetic energy?

Back

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

Front

How does height affect gravitational potential energy?

Back

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

Front

What happens to kinetic energy as an object falls?

Back

As an object falls, its gravitational potential energy is converted into kinetic energy, increasing its speed.

Front

Explain the relationship between kinetic energy and speed.

Back

Kinetic energy is proportional to the square of the speed; if the speed doubles, the kinetic energy increases by a factor of four.

Front

What is the formula for calculating the increase in kinetic energy?

Back

The increase in kinetic energy can be calculated using the formula: ΔKE = KE_final - KE_initial.

Front

What is the significance of point of maximum kinetic energy in a falling object?

Back

The point of maximum kinetic energy occurs just before the object hits the ground, where all potential energy has been converted to kinetic energy.

Front

How does friction affect the conservation of energy?

Back

Friction converts some mechanical energy into thermal energy, leading to energy loss in the system, which means not all energy is conserved as mechanical energy.

Front

What is the gravitational potential energy of a 10 kg box on a shelf 2 meters high?

Back

PE = mgh = 10 kg * 9.8 m/s² * 2 m = 196 J.