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
Force definition
Something which changes the motion of an object
Energy definition
The capacity for doing work
Momentum definition
Consists of an objects mass and velocity, relates to how force would be required to stop it
