PRESENTATION OUTLINE
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 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. = 9.8 m/sec. 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 0
-Falling object STOPS accelerating.
Air resistance
-Air resistance is a force that opposes gravity.
-Acts in opposition to objects falling through the air.
-Air resistance depends on surface area, size, shape and 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 pushes the object in a horizontal movement and gravity brings the object to a vertical movement.
-The combination of the force forward and pull downward makes a curved path.
