Gravity

1
Gravity
2
Friction

• The force that 2 surfaces exert on each other
  when they rub against each other is called
  FRICTION

3
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

4
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.

5
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.

6
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.

7
Projectile Motion

• A THROWN object is called a projectile
• A projectile will fall at the SAME rate as a
  dropped object.