Force
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Transcript of Force
Section 2
Force
Force – push or pull
• a force always acts in a certain direction• ex. if you push something, the force is
in the direction of the push
Forces in Nature
• Electric force• ex. lightning
• Magnetic force• ex. magnetic poles
Weight is a force
Newton
• Unit used for force (N)
Net force• The combination of all the forces acting on an object.• How do you determine the net force of an object if all
forces act on the same direction. • The answer depends on the directions of the forces
Ballanced and unbalanced forces• When the forces on an object produce a net force of 0 N, the forces
are balanced.• Balanced forces do not cause a nonmoving object to start moving.• When the net force on an object is NOT 0 N, the forces on the object
are unbalanced.• Unbalanced forces are necessary to cause a nonmoving object to
strat moving.
What is friction?
• Friction• force that opposes the motion of an
object• the force of friction works in the opposite
direction of the force of motion
Friction occurs because the surface of any object is rough
• The amount of friction between two surfaces depends on many factors.
• Two factors include the force pushing the surfaces together and the roughness of the surfaces.
Types of Friction• Kinetic Friction
• The word kinetic means “moving” , friction between moving surfaces
• In which of the two pictures friction is smaller?
Static Friction• When a force is applied to an object but does no
cause the object to move.• The word static means ……….
CLASSWORK
• IN YOUR OWN WORDS, WRITE A DEFINITION FOR THE TERMS FRICTION AND FORCE.
• LIST THREE FORCES YOU EXCERT WHEN RIDING A BICYCLE.
• EXPLAIN HOW FRICTION CAN BE HARMFUL AND HELPFUL.
• EXPLAIN WHY FRICTION OCCURS.• NAME TWO WAYS IN WHICH FRICTION CAN BE
INCREASED.• LIST THREE COMMON LUBRICANTS.• NAME SOME WAYS TO REDUCE FRICTION.• MAKE AN ILLUSTRATION EXPLAINING WHAT KIND OF
FRICTION IS BEING APPLIED.
THANK YOU