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A force is any push or ____________.
Force is measured in the unit _____________
http://www.brainpop.com/science/motionsforcesandtime/force/
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2 groups of forces CONTACT FORCES
Examples:FrictionNormalApplies
FORCES ACTING FROM A DISTANCE
Examples”ElectricalMagneticGravity
a force that is applied (by contact) to an object by a person or another object
Examples) pushing open a doorlifting weights
throwing a ball moving a box
Applied Force
The force of one object or surface rubbing against another. It opposes motion.
STATIC: Stays stillKINETIC: Moving
(Examples) snowboarding car driving on the road lab table against the floor
Friction
Surfaces touching
Pressure of objects
2 factors that effect Friction
Effects of friction Objects slow down Objects heat up
the support force exerted upon an object that is in contact with another stable (still) object
Examples) book on a table standing on the ground leaning against the wall
Normal Force
The force of charges (positive and negative) that react with each other
-The closer together the particles are, the stronger the force they create
Example) lightening in picture above
Electrical Force
The force that pulls objects towards each other
Weight is the force of gravity on an object
Any object with mass (matter) has gravity=
The Law of Universal Gravitation
Gravitational Force
2 things affect gravity Mass Distance between
objects
Magnetic poles attracting or repelling
Magnetic Force
Tension: force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends
Some other forces:
Spring Force: the force exerted by a compressed or stretched spring upon any object that is attached to it
Some other forces:
When the forces are ______________, they cause an object to speed up, slow down, or change direction.
The overall amount of forces acting on an object is a _________ force.
If the forces are acting in the same way then add them
Boy= 20 N Girl =20N20 + 20 = 40 N
If the forces are opposite, subtract them.
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