Please enable JavaScript.
Coggle requires JavaScript to display documents.
Forces (Energy screenshot-docs.google.com-2018-01-16-16-52-34-671 (Kinetic…
Forces
Newton's 1st Law of Motion
aka. law of inertia
net force 0=motion doesn't change
Objects have inertia
E.g. Water rockets go up as blasted off
Doesn't stop in midair
water rocket has inertia
Newton's 2nd Law of Motion
Acceleration=net force/mass
E.g. water rocket's acceleration = force exerts/ mass
a=F/m
Or just F=ma
Weight/mass are different
Newton's 3rd Law of Motion
For every action force, there is a reaction force
E.g. hammer strikes nail
E.g. water rockets
Force water bottle uses to go up=Force of water going down.
Energy
Kinetic energy
1/2 mv^2
e.g. ball falling down
object's energy due to motion
Potential energy
gravitational: mgh
e.g. on dive-board high in air
stored energy
Transfer of energy is work
Mechanical energy
Motion of everyday objects
e.g. speeding train
Work
Force*distance
W=Fd
e.g. person lifts up weights
when a force displaces object
Forces parallel to displacement do work
SI unit joules
1 N-meter
