Unit 4 Review: Conservation of Mechanical Energy

Front

The sum of the kinetic and potential energy in a system is known as the system's __________ energy.

Back

mechanical

Front

What does the Law of Conservation of Energy state?

Back

Energy cannot be created or destroyed.

Front

Which of the following objects has the most kinetic energy? A 20 kg toddler running at 5 m/s, A 50 kg toddler running at 30 m/s, A 90 kg toddler running at 30 m/s, A 100 kg toddler running at 2 m/s.

Back

A 90 kg toddler running at 30 m/s.

Front

In the next figure, an 8 kg cart has an initial velocity of 7 m/s before going down. Ignore friction, find the velocity when the cart arrives to point B.

Back

21 m/s.

Front

How much kinetic energy (KE) does a baseball with a mass of 0.143 kg have if it is traveling at a velocity of 41.1 m/s? HINT: KE = 1/2 mv^2

Back

120.8 J.

Front

What is kinetic energy?

Back

The energy an object possesses due to its motion.

Front

What is potential energy?

Back

The energy stored in an object due to its position or configuration.

Front

What is the formula for kinetic energy?

Back

KE = 1/2 mv^2.

Front

What is the formula for potential energy?

Back

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

Front

What is mechanical energy?

Back

The sum of kinetic and potential energy in a system.