WEEK FOUR: MOTION LECTURE
*Describing how things move
• Time & Distance > Used to calculate a speed
• Speed: Change in distance (w/ no direction)
• Velocity: Change in distance per time (d / t)
• Acceleration: Change in speed (v/t)
• Force: Something that sets objects in motion
▯no force ▯no motion
Distance traveled per time
(v x t ) = d
(d/v) = t
50 m/s = 100mph 3600/ 1 hour = 1 mile / 1600 min
convert meters to miles
and seconds to hours 50 x 3600/1600 = 100 mph
Speed and direction
if you know velocity, then you automatically know speed.
Velocity = (change in distance / change in time)
Any CHANGE IN VELOCITY divided by length of time.
(Final velocity – Initial velocity / time) = acceleration
Newton’s Laws of Motion:
Discovered laws of motion and gravity
Concept of one universe.
1. Newton’s First Law: Any object moves at constant velocity unless a net force
acts to change its speed or direction.
F = 0 then V = constant WEEK FOUR: MOTION LECTURE
2. Second Law: Any change of motion to a body is proportional to the force acting
on it and in the direction in which the force acts.
F = Mass x Acceleration
F= m x a
3. Third Law: For any force, there is always an equal and opposite reaction force.
F1 = F2
• Force causes change in momentum producing acceleration.
(Objects mass x objects velocity)
• Momentum is a vector just like velocity
• Total Momentum of objects is the sum of momentum’s individual objects.
• Conservation of momentum ▯Total momentum of a system of objects is fixed.
(P1 P2) (1 1 m2 2
• Total momentum of interacting objects can’t change unless an external fo