Module 3 - Section 1 - Motion Flashcards
What type of quantities are - displacement, velocity and acceleration ?
They are all vector quantities
Whats the definition of speed ?
It is how fast something is moving - regardless of direction —> as it is a scalar quantity
Whats the definition of displacement ?
It’s how far an object has traveled from its starting point in a given direction
- basically it’s the distance from point A to point B with a direction - so for e.g. 20m north
Whats the difference between distance and displacement ?
Distance is the length of the path that the object took from point A to point B - whereas displacement is the shortest possible route to point B with a direction
Whats the definition of velocity ?
It’s the rate of change of the objects displacement ( its speed with a given direction )
What is the definition of Acceleration ?
It’s the rate of change of an objects velocity
How do you calculate the average speed during a journey ?
It’s simple :
It’s just the total distance covered during the journey over the total time elapsed
So:
Total distance / total time
What is instantaneous speed ?
It is the speed of an object at any given point in time
What does uniform acceleration mean ?
Uniform acceleration means constant acceleration
What are the four main equations that you need to solve questions involving uniform acceleration
v = u + at
s = ( u + v ) / 2 x t
s = ut + 1/2at*2
v2 = u2 + 2as
