module 3 - physics

Created by

Laura Pedzisz

Cards (79)

free fall is only gravity
the gradient of a displacement time graph is the velocity
on a d-t graph a larger acceleration will have a steeper gradient
on a d-t graph a smaller acceleration will have a less steep gradient
on a d-t graph deceleration will have a decreasing gradient
on a v-t graph the gradient is the acceleration
on a v-t graph the area under the graph is the displacement
on a v-t graph is the line is curved it means non-uniform acceleration
a net force is needed for the object to accelerate
if forces are balanced they're in equilibrium
most common forces
weight
normal contact
tension
friction
the acceleration of an object is directly proportional to the force applied
$F=$ $MA$ is newtons second law
all objects fall at the same rate if you ignore air resistance
To work out the horizontal component of a force you use Fh=fcos0
to work out the vertical component of a force you use Fv=Fsin0
the equation for weight is $W=$ $mg$
friction is a force that opposes motion
terminal velocity is when the friction = driving force
constant friction is between two surfaces
fluid friction is drag or air resistance
density is the mass per unit volume and the equation for it is $\rho=$ $m/v$
pressure is the force per unit are and the equation is either p=h(density)g or $p=$ $f/a$
upthrusts equal to the weight
a moment is the turning effect of a force
the equation for moments is M=FD
A couple is a pair of forces that don't cause any resultant linear force but does produce a turning force (usually called a torque)
the equation for a torque is T=FD
work is done when energy is transferred
the equation for work is $W=$ $Fx$
work is the energy that's been changed from one form to another
power is the work done per second
the equation for power is either P=W/T or P=FV
Power is measured in watts
work done is measured in joules
energy is measured in joules
density is measured in kg/m3
pressure is measured in pascals
kinetic energy is the energy an object has when its moving
the equation for kinetic energy is Ek=1/2mv^2