GRAVITY AND MOTION

GRAVITY AND ACCELERATION

• Objects fall to the ground at the same rate-regardless of mass.
• Acceleration due to gravity depends on force and mass.

ACCELERATION AND VELOCITY

• Acceleration is the change in velocity over time.
• Velocity is a speed in a certain direction.
• Unbalanced forces cause objects to accelerate.
• Gravity is the downward, unbalanced force that acts on an object on a falling object.
• For every second an object falls, its downward velocity increases by 9.8m/sec.

ACCELERATION AND TERMINAL VELOCITY

• As the speed of a falling object increases, air resistance increases.
• Terminal velocity happens when the downward force of gravity equals the force of air resistance.
• Net Force=0
• 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, speed of the object.

FREE FALL AND AIR RESISTANCE

• An object is in freefall when the only force acting is gravity.
• There can be NO air resistance.

PROJECTILE MOTION

• Two movements: force gives horizontal movement, gravity pulls down on it.
• These cause the object to go in a curved path.