GRAVITY AND MOTION

GRAVITY AND ACCELERATION

• Objects fall to the ground at the same rate, regardless of mas or weight
• Acceleration due to gravity depends on force and mass

ACCELERATION AND VELOCITY

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

ACCELERATION AND TERMINAL VELOCITY

• As the speed of a falling object increases, air resistance increases
• Terminal velocity when the downward force of gravity = the upward force of air resistance
• Net Force = 0 Newtons
• Falling object stops accelerating

AIR RESISTANCE

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

FREE FALL AND AIR RESISTANCE

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

PROJECTILE MOTION

• Two movements: force and gravity
• force---------->
• gravity goes down