P1 Motion Flashcards
Weight is
The amount of gravitational force an object is experiencing, is a VECTOR, is a force so measured in N
Mass is
How much of something there is, is a SCALAR, measured in Kg
Scalar
A physical quantity with only magnitude, e.g. speed, distance, mass, energy etc.
Vector
A physical quantity with magnitude and a direction, e.g. force, velocity, displacement, weight, acceleration
Difference between distance and displacement
Distance is a scalar, how far something has moved
Displacement in a vector, how far something has moved in a specific direction
Difference between speed and velocity
Speed is a scalar, how fast something is moving
Velocity is a vector, how fast something is moving in a specific direction
Acceleration is
The change in speed/velocity of an object over time(- acceleration is deceleration)
Acceleration, velocity, time formula
Acceleration = change in velocity/ time
a=v-u/t
Change in velocity is final velocity-starting velocity(v-u)
Distance, speed equation
Speed=distance/time
How can speed be measured in a school
Time an object move 1 meter, do 1 / time in seconds
Typical speeds for walking, running, cycling, car
Walking 1.4 m/s Running 4 m/s Cycling 6m/s Car on motorway 31m/s Car on typical town speed limit 10.5 m/s
Distance/time graphs
Flat = stationary Steep = fats Shallow = slow Curving = acceleration
How to determine average speed from a distance/time graph
Take an amount of time, e.g. 10 seconds, then find the change in distance over the 10 seconds to calculate speed with s=d/t
Acceleration, velocity, distance formula
v^2-u^2= 2ax
Velocity/time graphs
Going up = speeding up, going down = slowing down, flat = constant speed
Steep = large acceleration, shallow = slow acceleration
+velocity = going away
-velocity = coming towards
