Force, Motion, Energy
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Transcript of Force, Motion, Energy
Force, Motion and Force, Motion and EnergyEnergy
How do things move?How do things move? AboveAbove BelowBelow AheadAhead BehindBehind UpUp DownDown HorizontallyHorizontally VerticallyVertically Right Right LeftLeft
How do we know something How do we know something has moved?has moved?
By looking at the things By looking at the things that are not moving that are not moving around it. around it.
FRAME OF REFERENCE FRAME OF REFERENCE
SpeedSpeed
What is speed? What is speed? How fast an object How fast an object
is moving.is moving. Measure of Measure of
distance.distance.
SpeedSpeed
How do I calculate How do I calculate speed? speed?
DISTANCE / TIMEDISTANCE / TIME
Ex:10ft/ 3 seconds=3.1 ft/secEx:10ft/ 3 seconds=3.1 ft/sec
ForceForce
WHAT IS FORCEWHAT IS FORCE??
Any Any pushpush or or pullpull that that causes an object to causes an object to move, move, stopstop or or change change speedspeed or or directiondirection. .
ForceForce
The greater the The greater the force, the greater the force, the greater the change in motion. change in motion.
The bigger an object The bigger an object is, the less effect a is, the less effect a force will have on it.force will have on it.
The smaller an object The smaller an object is, the more effect a is, the more effect a force will have on it.force will have on it.
InertiaInertia
InertiaInertia keeps an keeps an object still or keeps object still or keeps it moving. it moving.
A moving object will A moving object will keep moving until keep moving until something stops itsomething stops it..
An object that is not An object that is not moving will not moving will not move until move until something moves something moves itit. .
FrictionFriction
WHAT IS FRICTION?WHAT IS FRICTION? The force that works The force that works
against motion.against motion. Friction causes heat. Friction causes heat.
WorkWork
WHAT IS WORK?WHAT IS WORK? Work is done when Work is done when
a force is used to a force is used to MOVEMOVE an object a an object a certain distance.certain distance.
EnergyEnergy
WHAT IS ENERGY?WHAT IS ENERGY?
Energy is the ability to do work.Energy is the ability to do work.
EnergyEnergy
Two types of Two types of energy:energy:
Kinetic Kinetic PotentialPotential
EnergyEnergy
Kinetic-moving Kinetic-moving energy (energy of energy (energy of motion)motion)
EnergyEnergy
Potential- stored Potential- stored energy (energy energy (energy waiting to be used)waiting to be used)
Forms of EnergyForms of Energy
Chemical EnergyChemical Energy Ex: Ex: storedstored energy energy
in food and fuel.in food and fuel.
Forms of EnergyForms of Energy
Electrical EnergyElectrical Energy Ex: batteries, Ex: batteries,
electric in homeselectric in homes
Forms of EnergyForms of Energy
Light energyLight energy Ex: sun and lasersEx: sun and lasers
Forms of EnergyForms of Energy
Mechanical EnergyMechanical Energy Ex: wind, water Ex: wind, water
falling over a water falling over a water fall, soundfall, sound
Forms of EnergyForms of Energy
Thermal EnergyThermal Energy Ex: stove, heaters, Ex: stove, heaters,
matchesmatches
Forms of EnergyForms of Energy
Nuclear EnergyNuclear Energy Ex: SunEx: Sun
Forms of EnergyForms of Energy
CAN ENERGY CAN ENERGY CHANGE FORM? CHANGE FORM? YES! YES!
Ex: The fuel in a Ex: The fuel in a rocket changes rocket changes from chemical from chemical energy to energy to mechanical energy mechanical energy when the fuel when the fuel burns burns
Simple MachinesSimple Machines
LeversLevers PulleyPulley Wheel and AxelWheel and Axel Inclined PlaneInclined Plane Wedge and ScrewWedge and Screw GearsGears
Simple MachinesSimple Machines
LeversLevers
Two parts:Two parts:
FulcrumFulcrum
BarBar
Simple MachinesSimple Machines
PulleyPulley Two kinds: Two kinds:
FixedFixed
MoveableMoveable
Simple MachinesSimple Machines
Wheel and AxelWheel and Axel Two parts:Two parts:
wheel wheel
barbar
Simple MachinesSimple Machines
Inclined PlaneInclined Plane
A flat, slanted A flat, slanted surfacesurface
Simple MachinesSimple Machines
Wedges and Wedges and ScrewsScrews
change change downward downward force into force into sidewayssideways forceforce
Simple MachinesSimple Machines
GearsGearsWheels with teethWheels with teeth
Compound MachinesCompound Machines
WHAT IS A WHAT IS A COMPOUND COMPOUND MACHINE?MACHINE?
A machine made up A machine made up of two or more of two or more simple machines.simple machines.