Newtons 1st law
- An object will stay in motion or stay at rest unless acted upon by an "unbalanced force".
-Types of unbalanced forces include friction and gravity.
- In other words the law states that an object will keep moving or not moving until a force
causes it to be unbalanced.
- Two different types of equilibrium are static and dynamic
- Static equilibrium means the the object is at equilibrium but is stationary
Nick stands on skateboard and it doesn't move.
Channing rides a skateboard down the drive way at a constant velocity until he is stopped by an unbalanced force (kinetic friction).
Newtons 2nd law
- The sum of Forces is equal to mass times acceleration, F=ma
- The acceleration of an object is directly proportional to the net force acting on the object and
inversely proportional to the objects mass.
Horizontal
Nick pushes channing on a skateboard with 200 N of force. Channing weighs 75 kg, calculate
his acceleration.
Now if we add a dog onto the skateboard who weighs 50 kg, and nick pushes with 200 N of
force, solve for the acceleration. How does it change the acceleration?
Now if Channing gets off the skateboard and nick pushes with 200 Newtons of force.
Therefore, during the small duration of time when Nick pushes each weighted skateboard, the distances will vary among the examples. The skateboard with only the dog (lightest skateboard) will travel the furthest and the skateboard with both Channing and the dog (heaviest skateboard) will travel the least distance. This is because it takes more force to move a heavier object than it does to move a lighter object.
Vertical
A skateboarder is in the air after launching off a ramp and is perpendicular to the ground.
Newtons 3rd Law
- Every action has an opposite and equal reaction
Because newtons 3rd law is true, when Channing jumps of the skateboard it moves back with an
opposite reaction.
If newtons 3rd law wasn't true then when Nick stands on the skateboard then skateboard would
go through the ground.
Bloopers
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