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Motion Work Energy by Bhavna Ramkumar 520 IMG_20180117_160042 (Work,…
Motion
Work
Energy
by Bhavna Ramkumar 520
forces
push or pull on a object
can cause
accelerate a moving object
a resting object to move
unit Newton(N)
newton
first
law of motion
motion of object does not change if 0
ex a soccer ball on grass remains motionless unless kicked
also called law of intertia
object at rest remains in rest
for ex. soccer ball has interia
ex Water rocket used force from pump to launch, before the force it stayed at rest
newton
second
law of motion
formula
acceleration= net force/mass
weight =mass times acceleration due to gravity
ex net force on a ball
N/kg = m/s²
force is applied to the rocket to accelerate
newton
third
law of motion
action and reaction forces
equal and opposite reaction force
ex a swimmer
action force
using arms to push against water
reaction force
pushes the swimmer forward in water
ex water rocket
action force
pump releases air into the rocket to launch
reaction force
water rocket launches
momentum
mass times velocity
it depends on the size
law of conservation of momentum
no net force = no change of momentum
momentum is conserved
Energy
ability to do work
potential
stored energy result of position or shappe
Gravitational potential enery
depends on mass, height,acceleration
PE=mgh
kinetic
moving of object depends on mass and speed
KE=1/2 mv^2
mechanical
associated with motion of everyday object
potential energy + kenatic energy
Work
power
work/time
rate of doing work
depends on direction
force with no direction = no work
requires motion
no movement = no work
SI unit
joule (J)
force times distance
