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 causes an objects to accelerate
• Gravity is the downward, unbalanced force that acts a falling object = 9.8 m/secs squared
• 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 - when the downward force of gravity equals the upward force of air resistance
• Net Force - ØN
• Falling object stops accelerating

AIR RESISTANCE

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

AIR RESISTANCE AND FREE FALL

• An object is in freefall when the only force acting on it is gravity
• There can be no air resistance

PROJECTILE MOTION

• Two movements force - horizontal
• Has a curved path