GRAVITY AND MOTION

GRAVITY AND ACCELERATION

• Objects fall to the ground at the same rate regardless of mass or 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 cause objects to accelerate.
• Gravity is the downward, unbalanced force that acts on falling objects.
• For every second an object falls, its downward velocity changes over time.

ACCELERATION AND TERMINAL VELOCITY

• Air resistance increases as speed of a falling object increases.
• Terminal velocity is when the downward force of gravity equals the upwards force of air resistance.

AIR RESISTANCE

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

FREE FALL AND AIR RESISTANCE

• 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 gives projectile motion a horizontal motion.
• Gravity brings the object down in a vertical movement.