1. Flashcards
- converting m/s to km/h
2. converting km/h to m/s
- times by 3.6
2. divide by 3.6
What is the equation for acceleration?
Acceleration = (Final Velocity - Initial Velocity) / Time
OR
Acceleration = Change in Velocity / Time
Give some examples of scalar quantities.
Time, Speed, Distance, Mass
Define displacement
- displacement is the direction and distance an object moves in a straight line
- vector quantity
Define speed
- Scaler quantity
* Just how fast an object is moving (no direction).
Define velocity
- Vector quantity
* How fast an object is moving in a certain direction.
What is the speed equation?
Speed = Distance / Time
What is the first law of motion?
inertia - the resistance to a change in state of motion
What is the force equation?
Force = Mass x Acceleration
Define distance
- Scalar quantity
* How far an object moves (no direction)
What does gradient measure in Distance-Time and Speed-Time graphs?
DT - Speed
ST - Acceleration
What is the difference between vector and scalar quantities?
Vector: has direction
Scalar: only has magnitude
Give some examples of vector quantities.
Acceleration, Force, Momentum, Weight
Gradient formula
m = Y2 - Y1/X2 - X1
acceleration
the rate at which velocity changes
Positive acceleration: speeding up
Negative acceleration: slowing down
KE
KE = 1/2 x m x v^2
GPE
GPE = m x g x h (mass, gravity, height)
OR
GPE = weight x height
Total Energy
E = KE + GPE
Newton’s second law
The acceleration of an object depends on its mass and force applied
unit of measurement for KE and GPE
J (joules)
converting distance
time when going down
divide when going up e.g. m to km
what is the distance/speed/time triangle?
——d——–
s (av) / t
(distance over speed/time)
what is the displacement/velocity/time triangle?
————-d——-
velocity / time
(displacement over velocity/time)
the force that moves an object has been done by
‘work’
the rate at which work is done is called;
power
the energy in a compressed or stretched spring is;
elastic potential energy
the amount of useful energy produced is called the;
energy efficiency
Weight formula
W = m (mass) x g (gravity) (9.81)
Average speed formula
Speed (av) = ½ (speed before - speed after)
e.g. car breaking
WARNING: no clue if we need this: it was needed in one of the revision sheets
