Equations + Definitions Flashcards
(25 cards)
acceleration formula
v-u
—— = a
t
v
Final velocity m/s
u
Initial velocity m/s
t
Time s
a
Acceleration m/s^2
speed =
Distance / time
Walking pace
1-2 m/s
Running pace
5-8 m/s
Distance gone =
Area under line in graph
Scalar def
Size, no direction
Vector def
Size and direction
Scaler eg (3)
Speed, distance, energy
Vector eg (3)
Velocity, displacement, acceleration
how do you find speed from a distance time graph
Gradient
What’s the gradient in a velocity time graph?
Acceleration
Gravity on earth
10N
V^2- u^2 = 2 x a x X
(final velocity)^2 - (initial velocity)^2 = 2 x acceleration x displacement
How do find the gradient
Change in y / change in x
efficiency =
efficiency = (useful energy out) / (total energy in)
GPE=
GPE=mass x gravity x change in height
KE =
KE= 1/2 x mass x velocity^2
Thermal conductivity =
How easily a material loses heat energy
Convection =
A transfer by heating that involves particles moving and colliding
Conduction =
Transfer by heating that involves particles vibrating and colliding but NOT moving about
