Rollercoasters are a perfect example of a closed system of energy., both kinetic and potential!

At what point is the kinetic energy the greatest?

• X

• W

• Y

• Z

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Work is measured in Joules.

What is a Joule ?

• Newton-Joule

• Force-Foot

• Newton-Meter

• Newton-Kilometer

Tags

NGSS.MS-PS3-4

How much work needs to be done to move a box 5 meters with a force of 16 Newtons ?

____ Joules !

Mathematical Equivalence

ON

Describe the ENERGY at Point W !

• At Point W, the kinetic energy is the HIGHEST

• At Point W, the kinetic energy is HALF the Potential Energy

• At Point W, the potential energy is the HIGHEST

• At Point W, the Potential Energy is less than at Point Y

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

Kinetic energy is energy in ​ (a)   . Potential Energy is ​ (b)   energy

• motion
• lifting
• force
• stored

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Andrew moved a box of Pokemon cards 5 meters. He put 150 Joules of work into moving the box. How much force did he use to move the box ?

• 30 Newtons

• 30 Joules

• 750 Newtons

• 750 Joules

Tags

NGSS.MS-PS2-2

Match the following simple machines to their descriptions

• 2 round shapes connected at the center

• Pulley

• Inclined plane wrapped around a cylinder

• Wheel and Axel

• Uses a fulcrum & beam to raise and lower

• Screw

• Used to separate or secure 2 objects

• Wedge

• Changes the direction of a force

• Lever

A fixed point that a lever pivots on is called a ...

• fulcrum

• joint

• axel

• cylinder

In order to do WORK on an object, the FORCE you exert must be ...

• The maximum force you can apply

• In the same direction as the objects motion

• in the direction opposite to the force of gravity

• quick and deliberate

Which of the following is an example of work beiong done on an object ?

• Holding a heavy object at a construction site

• trying to push a parked car

• pushing a child on a swing

• Holding a door shut on a windy day