2. Speed & Velocity
⢠Speed - the rate of change in
position over time (distance/time)
⢠Instantaneous speed
⢠Average speed
⢠How is velocity different from
speed? Velocity describes both
speed and direction
6. Balanced Forces
Book on table
1. Weight of the book
is downward force
caused by gravity
2. Table pushes back
with an equal and
opposite force
Net force is zero
9. Types of Friction
⢠Static Friction: (Couch Potato)
âForce between objects at rest
⢠Sliding Friction: (Ice skating)
âSolid surfaces slide over each other
⢠Rolling Friction: (Rollerblading)
âAn object rolls over a surface.
⢠Fluid friction: (Submarine)
âAn object moves through a fluid
15. Newtonâs 1st
Law
An object at rest remains at
rest and an object in motion
will continue moving at a
constant velocity unless acted
on by unbalanced forces.
19. Newtonâs 2nd
Law
⢠More force means more
acceleration
⢠More mass means less
acceleration
Force = mass X acceleration
F = ma
20. Newtonâs 3rd
Law
For every action, there is an equal
and opposite reaction.
Forces occur only in pairs
â Act on different objects
â Equal and opposite