Work, Energy and Power Review

Front

What is work in physics?

Back

Work is defined as the product of the force applied to an object and the distance over which that force is applied, in the direction of the force. It is measured in joules (J).

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 gravitational potential energy?

Back

Gravitational potential energy is the energy an object possesses due to its height above the ground, calculated using the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

What is power in physics?

Back

Power is the rate at which work is done or energy is transferred, measured in watts (W). It can be calculated using the formula Power = Work/Time.

Front

What is the relationship between velocity and kinetic energy?

Back

Kinetic energy is proportional to the square of the velocity. If the velocity increases by a factor of n, the kinetic energy increases by a factor of n².

Front

What happens to kinetic energy when mass is doubled?

Back

If the mass of an object is doubled while keeping the velocity constant, the kinetic energy also doubles, since KE = 1/2 mv².

Front

What is the formula for calculating work?

Back

The formula for calculating work is Work = Force x Distance x cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the unit of energy?

Back

The unit of energy is the joule (J).

Front

How do you calculate the change in gravitational potential energy?

Back

The change in gravitational potential energy can be calculated using the formula ΔPE = mgΔh, where Δh is the change in height.

Front

What is the significance of a change in mass in terms of work?

Back

A change in mass does not result in work being done unless there is a force acting over a distance.