Physics Flashcards
Write the five kinematic formula:
v = u + at v^2 =u^2 +2as Vav = s/t s = ut + 1/2at^2 Vas = v+u / 2
formula for average velocity:
Vav = s/t
The two formula’s for acceleration
a = (change in)v / (change in)t a = v-u / t
changing from k/m to m/s and vice versa:
km/h divided by 3.6 = m/s
m/s x 3.6 = km/h
definition of acceleration:
Acceleration is the rate of change in velocity
Formula of displacement:
d = s / t
What is important to remember when dividing by time?
Remember to divide by the time interval not the total time
Formula of gradient and average velocity:
rise / run
Three facts about a speed-time graph:
- Area under graph = distance travelled.
i. e. b x h / 2 - straight horizontal line = constant speed
- straight diagonal line = constant acceleration
Two facts about a distance-time graph:
- straight diagonal line = constant speed
- curved line = constant acceleration
Important to remember when finding the distance travelled on a speed time graph:
You may have to split the area under the graph.
Newton’s second law:
F = ma
Definition of momentum:
A way of measuring how much “movement” is taking place.
Formula for momentum:
p = mv
About momentum
Momentum before = momentum after
formula of impulse:
j = F (change in)t
F (change in)t = m (change in)v
Work formula:
w = fs
Important fact about work:
Have to actually move to have done work.
The mechanical energy for a closed system fact:
MEstart –> MEend
what is a closed system?
no outside influences
The connection between kinetic and potential energy:
Ek Ep
Kinetic energy formula:
1/2mv^2
Potential energy formula:
mgh
Conversion of joules:
j / 1000 = kj / 1000 = mj
