KEY EQUATIONS Flashcards
Average speed =
average speed = distance/time
V = d/t
Velocity =
Velocity = change in displacement/time taken
how to subtract a vector
to subtract a vector, add on the vector to be subtracted in the opposite direction
acceleration =
acceleration = gradient of velocity time graph
Displacement =
displacement = area under velocity time graph
The four equations of motion (Suvat)
V = u + at S = (u + v)/2 x t S = ut + 1/2 at² V² = u² + 2as
For a velocity v at an angle θ to the x-direction the components are:
x-direction: v cos θ
y-direction: v sin θ
In the absence of air resistance, an object has:
constant velocity horizontally and constant acceleration vertically.
Resultant force =
Resultant force = Mass x acceleration
F = ma
Weight =
Weight = Mass x acceleration of free fall W = mg
What do all physical quantities have
all physical quantities have a numerical magnitude (a numerical size) and a unit
What are base units in mechanics
length, mass, time, current and temperature are base units in mechanics
What on each side of a physics equation are the same`
base units on each side of a physics equation are the same
What should you do when you draw a scale drawing
when you draw a scale drawing you should:
State the scale used
draw a large diagram to reduce the uncertainty
What happens in a body is in equilibrium
if a body is in equilibrium, there is no resultant force and no resultant torque or moment about any point
When is work done
work is done on a body when a force moves (displaces) the body in the direction of the force.
Energy is then transferred from one body to another
work done =
Work done = force x distance
W = Fs
What does work done =
work done = energy transferred
Work done (angle)
Work done = Fs Cos θ
