GRAVITY AND MOTION

GRAVITY AND ACCELERATION

• Objects fall to the ground at the SAME rate
• Rate - regardless of mass/weight
• Acceleration due to gravity depends on force and mass

ACCELERATION AND VELOCITY

• Accleration 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 = 9.8m/sec squared
• For every second an object falls, its downward velocity increases by 9.8m/sec squared

ACCELERATION AND TERMINAL VELOCITY

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

AIR RESISTANCE

• Force that opposes gravity
• Acts in opposition to objects falling through the air
• Depends on surface area, size, shape, and speed of the object

AIR RESISTANCE AND FREE FALL

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

PROJECTILE MOTION

• Two movements
• Force causes a horizontal movement
• Gravity causes a vertical movement
• As a result, projectile motion forms a curved path