Understanding Mechanical Energy

What is the formula for calculating kinetic energy?

• 1/2 mv^2

• v^2 = u^2 + 2as

• mgh

• F = ma

How is potential energy due to gravity calculated?

• v^2 = u^2 + 2as

• 1/2 mv^2

• F = ma

• mgh

Why can different forms of energy be compared?

• Because energy is a vector quantity

• Because energy is a scalar quantity

• Because energy is always potential

• Because energy has direction

What happens to potential energy if the height is tripled?

• It triples

• It doubles

• It quadruples

• It remains the same

If velocity is tripled, how does kinetic energy change?

• It increases nine times

• It remains the same

• It doubles

• It triples

What does the conservation of energy principle state?

• Energy can be created or destroyed

• Total energy remains constant

• Energy is always potential

• Energy is always kinetic

In the roller coaster example, what happens to energy at the top of the hill?

• It is half kinetic and half potential

• It is all potential

• It is zero

• It is all kinetic

In the Spider-Man example, what was the final velocity when he reached the roof?

• 20.2 m/s

• 10.2 m/s

• 15.2 m/s

• 17.2 m/s

What is the significance of mass in energy equations?

• Mass always increases energy

• Mass can cancel out in energy equations

• Mass is irrelevant in energy equations

• Mass decreases energy

In the waterfall example, what was the initial velocity of the water?

• 24.2 m/s

• 26.2 m/s

• 22.2 m/s

• 20.2 m/s