Sol 5.2 Energy

P4 Work done, Energy and Power (Part 2)

Part 2 - Gravitational Potential Energy and Kinetic Energy

Open Ended

What do you think gravitational potential energy is?

Multiple Select

Which of these do you think are potential energy?

• Gravitational potential energy

• Chemical energy

• Strain energy

• Elastic energy

• Nuclear energy

Elastic/Strain Potential Energy

There is the potential for work being done when the spring is stretched or compressed for the spring to go back to its original length/position

Chemical potential energy

Energy stored in the bonds of atoms and molecules.

Anything that can be burnt and undergo chemical reactions has chemical potential energy.

FORMULA

Open Ended

Multiple Choice

• Chemical energy

• Kinetic energy

• Light energy

• Heat energy

Open Ended

Open Ended

Open Ended

Open Ended

Try out the simulator (link in the chatbox) and describe your observation/findings

Poll

At the top of the roller coaster (position A) the carriage has lots of __________________

• Kinetic energy

• Potential energy

Multiple Choice

As the carriage descends to position B, the GPE is transferred into _______________ and speeds up.

• Chemical energy

• Kinetic energy

• Light energy

• Sound energy

Multiple Choice

Between B and C, the carriage keeps ________________ as its GPE is converted into KE.

• decelerating

• moving constantly

• accelerating

• flying

Open Ended

If you ignore any _________________ or friction between the carriage and the track, then all GPE the carriage had at A will be converted to KE when it reaches C.

Multiple Choice

A real carriage loses some energy through friction on the way down the hill.

It needs to have enough ______________ left at point C to carry it up the hill again to D.

• power

• GPE

• KE

KINETIC ENERGY

DEFINITION OF KINETIC ENERGY

• The energy that an object has because it is in motion (moving).

• All moving object has kinetic energy

• The magnitude of the kinetic energy depends on the speed (velocity) and mass of the object.