Forces Flashcards
What are vector quantities
Have magnitude and direction
What are scalar quantities
Only have magnitude
What is a contact force
When objects are touching
What is a non-contact force
When objects aren’t touching
What is work done
Energy transfer
Equation for work done
W=Fs
When is an object in equilibrium
When the forces that are acting on it are equal
What is elastic deformation
When it can return to its original shape and size
What is inelastic deformation
When the object does not return to its original shape
Equation for elastic potential energy
1/2 ke^2
Equation for moment
M=Fd
What is the speed of a large gear compared to a smaller gear
Slower
Equation for pressure
P = F/A
Equation for pressure in a liquid
P = hpg
p = density
What is upthrust
When the force exerted on the bottom of the object is larger than the force acting from the top
When does an object float
If weight = upthrust
Equation for acceleration
Delta V/ T
Equation for final velocity
V^2 = U^2 + 2as
Equation for inertial mass
m = F/a
What is stopping distance
The distance it takes a car to stop in an emergency
What is thinking distance affected by
Speed
Alcohol
Drugs
Tiredness
What is braking distance affected by
Speed
Weather
Tyre condition
Brake condition
Equation for momentum
P = mv
What is the momentum before compared to the momentum after
Equal
Another way F = x v-u/t can be written
F =mv/t
