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 overtime
• 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/s squared
• For every second an object falls, its downaward velocity increases

ACCELERATION AND TERMINAL VELOCITY

• Air resistance increases as the speed of a falling object increases
• Terminal velocity is when the downward force of gravity equals the upward force of air resistance
• Net force = Zero Newtons
• Falling object stops accelerating

AIR RESISTANCE

• Force that opposes gravity
• Acts in opposition to objects falling through the air
• Depends On: Shape of objects, speed of the objects,
• Surface area and size of the object.

FREE FALL AND AIR RESISTANCE

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

PROJECTILE MOTION

• Two movements:
• Force; gives horizontal motion
• Gravity; gives vertical motion
• Combination makes objects curve towards earth.