Work & Energy Review

Front

What is the definition of work in physics?

Back

Work is defined as the product of force exerted parallel to the direction of displacement and the distance over which the force is applied.

Front

How do you convert kilometers per hour (km/hr) to meters per second (m/s)?

Back

To convert km/hr to m/s, divide the speed by 3.6.

Front

What are the variables needed to calculate kinetic energy?

Back

The variables needed to calculate kinetic energy are mass (m) and velocity (v).

Front

What is the formula for calculating kinetic energy?

Back

The formula for kinetic energy (KE) is KE = 0.5 * m * v^2.

Front

If a 3.00 kg toy falls from a height of 10.0 m, what is its kinetic energy just before hitting the ground?

Back

The kinetic energy just before hitting the ground is 294 J.

Front

What is mechanical energy?

Back

Mechanical energy is the sum of kinetic energy and potential energy.

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or configuration.

Front

What is the formula for calculating potential energy?

Back

The formula for potential energy (PE) is PE = m * g * h, where m is mass, g is the acceleration due to gravity, and h is height.

Front

What is the relationship between work and energy?

Back

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

Front

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

Back

The unit of work in SI is the joule (J).