Friction and Gravity Ch. 2, Section 2 Page 42 – 50.

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Presentation transcript:

Friction and Gravity Ch. 2, Section 2 Page 42 – 50

Friction The force that 2 surfaces exert on each other when they rub against each other is called __FRICTION__ Friction Song: (2:25) http://www.youtube.com/watch?v=TkXAJHitPAY

The Causes of Friction The 2 factors that friction depends on are: __HOW HARD THE SURFACE PUSH TOGETHER AND THE TYPES OF SURFACES INVOLVED__ Friction acts in the __OPPOSITE DIRECTION__ to the object’s motion.

4 Types of Friction Friction on __NON-MOVING OBJECTS__ is called __STATIC FRICTION__ When 2 solid surfaces slide over each other you get __SLIDING FRICTION__ Objects that roll across a surface is called __ROLLING FRICTION__ The type of friction that occurs when an object travels through a liquid is called __FLUID FRICTION__ Book on floor – static friction Book Sliding on floor – Static friction Rolling ball (less surface area so easier to overcome friction) – rolling friction Trying to move through water or dropping paper through air – Fluid Friction

GRAVITY The force that pulls objects towards each other is called __GRAVITY__ Universal Gravitation Universal Gravitation means that __ALL OBJECTS ARE ATTRACTED TO EACH OTHER__ BrainPop: Gravity (2:43)

Factors Affecting Gravity __2__ factors that affect gravity are __MASS AND DISTANCE__ __MASS__ is a measure of the amount of matter in an object. The SI unit of mass is the __KILOGRAM__ __MORE__ mass and __SHORTER__ distance means greater gravitational force. Weight and Mass __MASS__ is the amount of matter in an object; __WEIGHT__ is the force of gravity on an object. BrainPop: Measuring Matter (4:17) Mass vs. Weight Song (3:13) http://www.youtube.com/watch?v=1whMAIGNq7E

Gravity and Motion Free Fall When the only force acting on a object is __GRAVITY__ the object is said to be in __FREE FALL__ Gravity is an __UNBALANCED FORCE__ Free Fall accelerates at a rate of __9.8 M/S2 __ __ALL__ objects fall at the same rate.

Air Resistance A type of fluid friction is __AIR RESISTANCE__ Air Resistance is an __UPWARD FORCE__ __TERMINAL VELOCITY__ is reached when the force of air resistance equals the weight of the object.

Projectile Motion A __THROWN__ object is called a projectile A projectile will fall at the __SAME__ rate as a dropped object. NFL Kicking - http://science360.gov/obj/tkn-video/fc729ef0-22ee-4f61-bb2a-b6c07685fb02/science-nfl-football-projectile-motion-parabolas