MOTION Flashcards
If a car travels from the house, to a shop, and back, what is the displacement?
Zero
How to calculate speed?
distance * times
What is velocity?
Speed in a direction
What is the gradient on a distance time graph?
Speed
What is the gradient on a velocity time graph?
Acceleration
What is the gradient on a displacement time graph?
Velocity
What graph and how to find displacement?
Area underneath velocity time graph
What is kinematics?
The study of motion of objects and their spacial relationships without giving reference to mass or forces that may chaneg its direction or speed.
What is the units for speed, velocity and acceleration?
Speed and velocity is ms^-1
Acceleration is ms^-2
What is the difference between average and instantaneous speed?
Average is over the whole journey whilst instantaneous is at a given point in time. Average speed does not change but instantaneous does.
Draw all graphs to know the shape
Look online to check
Components on suvat equation
s Displacement, u initial velocity, v final velocity, a acceleration, t time
What does an acceleration of 3ms-2 really mean?
Over the time given the car has accelerated by 3 m each second
What is the thinking distance?
Distance travelled between when the reason is first seen to when the brakes are applied
What is the braking distance?
Distance travelled from time the brake is hit to the car stops
What is the stopping distance?
Thinking + stopping
What is free fall?
Object is accelerating under gravity with no other force acting on it
What does g equal to?
9.8
Explain features of ‘trolleys? (investigating motion and collisions)
A wood block, ball- bearing wheeles to reduce friction, spring-loaded plunger for collisions, flat top for additional stacking
Explain ‘air-track gliders’ (investigating motion and collisions)
Investigate conservation of momentum after collision, reduces friction therefore maximises elastic collision
What is elastic collision?
There is no net loss in kinetic energy in the system as a result of the collsion
Describe ‘ticker timers’. (investigation in motion and collisions)
Long tape attached to moving trolley, threaded thro a device that places a tick upon the tape at regular intervals of time. Dots travel at same speed as trolley. Distance between dots and the time used to find velocity.
Describe ‘light gates’
Most accurate way or measuring time, connected vertically or horizontally to clamp
Descibr ‘data loggers’
An electronic device that record data and stores it for further analysis. Records at regular intervals or when triggered by a sensor eg light gate.
