GRAVITY AND MOTION

GRAVITY AND ACCELERATION

• Objects fall to the ground at the same rate—regardless of mass/weight.
• Acceleration due to gravity depends on force and mass.

ACCELERATION AND VELOCITY

• Acceleration is the change in velocity over time.
• Velocity is speed in a given direction.
• Unbalanced forces cause objects to accelerate.
• Gravity is the downward, unbalanced force that acts on falling objects = 9.8 m/sec'
• For every second an object falls, its downward velocity increases by 9.8 m/sec'

ACCELERATION AND TERMINAL VELOCITY

• As the speed of a falling object increases, air resistance increases.
• Terminal velocity is when the downward force of gravity equals the upward force of air resistance.
• Net force=0N
• Falling object STOPS accelerating.

AIR RESISTANCE

• Air resistance is a force that opposes gravity.
• Acts in opposition to objects falling through the air.
• Depends on surface area, size, shape, and speed of the object.

FREE FALL AND AIR RESISTANCE

• An object is in free fall when only the force acting on it is gravity.
• These can be NO air resistance.

PROJECTILE MOTION

• Two movements: horizontal and vertical.