Work Power and Energy Physics

Front

What is kinetic energy?

Back

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

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, where m is mass, g is acceleration due to gravity, and h is height.

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

How is work defined in physics?

Back

Work is defined as the energy transferred to or from an object via the application of force along a displacement, calculated as W = Fd cos(θ), where F is force, d is displacement, and θ is the angle between the force and displacement.

Front

What is power in the context of physics?

Back

Power is the rate at which work is done or energy is transferred, calculated as P = W/t, where W is work and t is time.

Front

What is the formula for calculating gravitational potential energy?

Back

The formula for gravitational potential energy is PE = mgh, where m is mass, g is the acceleration due to gravity (approximately 9.81 m/s²), and h is height above a reference point.

Front

What happens to potential energy as an object falls?

Back

As an object falls, its gravitational potential energy decreases while its kinetic energy increases, demonstrating the conversion of energy.

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 or decrease an object's kinetic or potential energy.

Front

How do you calculate the power output of a person climbing stairs?

Back

Power output can be calculated using the formula P = W/t, where W is the work done (equal to the change in potential energy) and t is the time taken.

Front

What is the difference between elastic potential energy and gravitational potential energy?

Back

Elastic potential energy is stored in objects that can be stretched or compressed (like springs), while gravitational potential energy is related to an object's height in a gravitational field.