A roller coaster car starts at rest at position 1, then moves to the right through position 4. Rank its potential energy at the 4 positions from highest.

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Presentation transcript:

A roller coaster car starts at rest at position 1, then moves to the right through position 4. Rank its potential energy at the 4 positions from highest to lowest. 1

In the same situation, rank the roller coaster's kinetic energy from highest to lowest. 2

A 500 kg car moves down the highway at a speed of 30 m/s A 500 kg car moves down the highway at a speed of 30 m/s. A truck moves down the same highway at 20 m/s. The truck's mass is 1000 kg. Which has more kinetic energy? 3

A 70 kg man stands on the low diving board, at a height of 2 m A 70 kg man stands on the low diving board, at a height of 2 m. A 50 kg woman stands above him on the high diving board, at a height of 3 m. Which person has more potential energy? 4

A bird flies in the air with a speed of 15 m/s. Its mass is 2 kg A bird flies in the air with a speed of 15 m/s. Its mass is 2 kg. If its mechanical energy is 800 J, what is the bird's potential energy? 5

Explain the law of conservation of energy in your own words.

What type of potential energy comes from springs or rubber bands that are stretched or compressed?

When a bow and arrow is used, the energy from the bow string being stretched out is converted to energy when the arrow flies toward a target. 8

When you go running, you are converting energy from the food you ate into energy. 9

When a big drum is played, energy is converted into energy. 10

When wood is burned to make a fire, energy in the wood is converted into energy. 11

A cell phone converts energy from its battery into energy needed to power the phone. That energy is then converted into energy that is observed when the phone is used. 12

When gas is burned to power your car, the When gas is burned to power your car, the energy from the gas is converted into energy.

A remote control plane has a mass of 5 kg A remote control plane has a mass of 5 kg. It flies at an altitude of 20 m, at a speed of 10 m/s. What is its mechanical energy?