Post on 03-Apr-2018
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Who Needs It??
Grade 6Mrs. Figoten
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ENERGY:POTENTIAL & KINETIC
Potential energy Stored up energy
or energy held inreadiness
Kinetic energy Energy of motion
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ENERGY:The ability to do
work & cause change KINETIC ENERGY
Energy of motion
EXAMPLES
moving bicycle
moving auto
high jumper jumping
runner
POTENTIAL ENERGY
Stored-up energy, or
energy held in readiness
EXAMPLES:
Elastic Potential Energy
Like slingshot or bungeecord
Gravitational Potential Energy
Like diver on diving board
or light bulb in off position
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POTENTIAL ENERGY
Most potential
Energy stored or held in readiness
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THE TRADE OFF BetweenPotential & Kinetic Energy
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KINETIC ENERGY
Energy of motion
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TYPES OF ENERGY
MECHANICAL Car, plane, wagon
THERMAL Heat from moving molecules
Inside all matter; furnace
ELECTROMAGNETIC Visible light, microwaves, radio
waves
CHEMICAL Batteries, matches,
body cells
ELECTRICAL Lightning, power lines
NUCLEAR Nuclear power plants,
atomic bomb, sun &stars
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FORCES & MOTION
FORCE
A Pushor a Pull
MOTION A Change of Position
or Location
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FRICTION AS A FORCE
Strength of friction depends
on:
Types of surfaces involved
How hard surfaces push
together
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TYPES OF FRICTION
SLIDING FRICTION 2 solid surfaces
Strength depends on roughness of surfaces
ROLLING FRICTION One solid rolls over the other Much easier to move object
FLUID FRICTION Solid moving through a liquid or gas Less than sliding friction
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GRAVITY AS A FORCE
FREE FALL
Object accelerates as it falls due to gravity
Object accelerates at rate of 9.8 m/s 2
Every second velocity increases by 9.8 meters per second
@ 2 seconds velocity is 9.8m/s + 9.8m/s = 19.6 m/s
@ 3 seconds velocity is 9.8m/s + 9.8m/s + 9.8m/s =29.4 m/s
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GRAVITY
AS A FORCE
AIR RESISTANCE Type of fluid friction that opposes motion
WEIGHT Measures force of gravity on object Weight = Mass X Acceleration due to Gravity
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WHAT MAKES OBJECTS
STARTMOVING . . .
STOP MOVING . . .
SLOW DOWN . . .
SPEED UP . . .
or CHANGE DIRECTION?
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NEWTONS FIRST LAW
An object at rest remains at
rest and an object in motionremains in motion unless acted
upon by an outside force.
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NEWTONS SECOND LAW
THE FORCE EXERTED BY AN OBJECT ISRELATED TO ITS MASS & ITSACCELERATION
AN OBJECTS ACCELERATION ISRELATED TO ITS MASS & THE FORCEREQUIRED TO MOVE IT
FORCE = MASS X ACCELERATION
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WHAT AFFECTS WHAT?
FORCE ACCELERATION
ACCELERATION FORCE
MASS FORCE
MASS ACCELERATION
FORCE = MASS X ACCELERATION
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NEWTONS
THIRD LAW For every action, there
is an equal &opposite reaction
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THE END