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.
Describe ‘video techniques’
Used to determin g, projectile motion and terminal velocity. The frames per second and distance must be known.
What do we presume in projectile motion?
No air resistance.
Describe acceleration for horizontal and vertical motion?
Horizontal motion - No acceleration, constant velocity
Vertical motion - When moving down -9.8
How can we demonstate that vertical and horizontal motion will take the same amount of time?
Drop a ball and project a ball from the same height.
Takes same amount of time.
What can suvat be used for in projectile motion?
Displacement, time of flight
How to find velocity of horizontal and vertical component?
Horizontal = vcosx
Vertical = vsinx
Other than no acceleration, why does horizontal veloctity remain constant?
HA = gcos90 = 0
What is pytha used for in projectile motion?
Finding the overal velocity.
What do we use trig for in projectile motion?
Find the angle of projection.
When is displacement 0 in projectile motion?
The vertical component (use in suvat).
What is symmetric parabola?
When there is a line of symmetry.
