Strand 2: Energy and Transformations

Unit 5 Student Notes

Read page 78 from the textbook.

Looking at the pictures on page 78 and 79, discuss what types of energys are evident and what machines produce this energy. 

Here are a few examples:

• Hockey sticks - third class lever

• stick blade - inclined plane

• skate blade - wedge

• screws on helmet - incline plane

Energy transfer

• Motion of arm increases potential energy in stick - potential energy → kinetic energy

• transfer of kinetic energy into the puck

• Teh energy transfer - sound is released as the stick hits the puck

• movement on the ice 

• loss of thermal energy - the friction between the puck and the ice

What pieces of equipment do you notice help to prevent energy transfer?

Equipment that absorbs kinetic energy to minimize energy transfer

• shin pads

• shoulder pads

• mouth guard

In this unit, we will be looking at:

• Energy can be transferred from one type into another

• When energy is transferred, some energy is lost (transferred) to thermal energy

• Simple machines can be used to make enrgy transfers easier

• Technology can be used to absorb (transfer) energy

• Energy use is important to society

• Control of friction (energy loss) occurs in various ways. 

Unit 5