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 of velocity over time
• velocity is speed in a given direction
• unbalanced forces cause objects to accelerate
• gravity is that downward, unbalanced forcethat acts on falling objects= 9.8 m/sec2
• for every second an object that falls 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 acceleration

AIR RESISTANCE

• force that opposes gravity
• acts in oppostion to objects faling through the air
• depends on surface area, size, and shape and speed of the object
• gravity is downward force: air resistance is the downward force that acts on an object

FREE FALL AND AIR RESISTANCE

• an object is in freefall when the only force acting on it is gravity
• there can be NO air resistance

PROJECTILE MOTION

• two movements: horizontal and vetrical
• force pushes the force forward
• gravity brings the movement downward
• the combination of force and gravitys movement give its object a curved path