CH. 12 CH. 12 LESSON 2LESSON 2

HOW DOES HOW DOES FORCE AFFECT FORCE AFFECT

MOTION?MOTION?

Activity-Roll OnActivity-Roll On

truck or cartruck or car Distance Distance (cm)(cm)

With rocksWith rocks

Without rocksWithout rocksHypothesis: I predict that the truck (car) will go further with or without

rocks.

forceforceany push or pullany push or pullcan change an object’s can change an object’s position or direction of position or direction of motionmotion

forceforcepushpush pullpull

pushpull

The greater the The greater the force on an object, force on an object, the greater will be the greater will be its change in its its change in its

motion.motion.

frictionfrictioncontact force that contact force that goes against the goes against the motion of an objectmotion of an object

Equal forces in Equal forces in opposite directions opposite directions does not cause a does not cause a change in motion.change in motion.

Tug of war

gravitygravityNon-contact force that Non-contact force that pullspulls

objects toward each otherobjects toward each otherthe greater the massthe greater the mass the the

greater the force of gravitygreater the force of gravity

weightweightamount amount of gravity of gravity that that pullspulls on on an objectan object

magnetismmagnetismnon-contact force non-contact force that that pullspulls on metals on metals with iron in themwith iron in them

FORCEFORCE any push or any push or pullpull

energy It takes It takes ________ ________ to apply or exert to apply or exert a force.a force.

A force can cause A force can cause a _________ in an a _________ in an object’s position object’s position or motion.or motion.

changechange

GRAVITYGRAVITYforce that force that pullspulls objects objects toward each toward each otherother

FRICTIONFRICTIONcontact force that contact force that goes against the goes against the motion of an objectmotion of an object

massmassthe greater the the greater the ______________ the the greater the greater the force of gravityforce of gravity

IRONIRONMagnetism is a non-Magnetism is a non-contact force that contact force that pullspulls on metals with on metals with ___________ in them.___________ in them.