Topic 2: Motion Flashcards
Average speed formula
V = d/t
Speed is the….
distance travelled per fixed time
Instantaneous speed
The speed of an object at a set point
Instantaneous speed formula
V = d/t
Acceleration
Rate of change of velocity
Acceleration is measured in
ms-2
When the velocity of an object changes…
it accelerates
If it is a negative acceleration…
it is a deceleration
The distance travelled =
area under speed time graph
How do we figure out distance travelled on a acceleration graph?
Using areas of triangles and rectangles
Acceleration formula
a = (v-u)/t
V is…
final velocity
U is…
inital velocity
What can a force change?
The shape, speed, and direction of an object
Mass
The amount of matter in an object
Weight
The force acting on an object due to gravitaional pull
Weight formula
W=mg
Newton’s first law
An object will remain at rest or continue at constant velocity in a straight line unless acted on by an unbalanced force
Free body diagram
A diagram to visualise the applied forces to an object. Requires size and direction to describe it.
Newton’s second law
If an unbalanced force, F, (in N, newtons) is applied to a mass, M (in kg, kilograms), it will accelerate at an acceleration of a (in ms-2) meters per second per second.
Force formula
F=ma
Newton’s third law
For every action force, there is an equal and opposite reaction force. If A exerts a face on B. B exerts on equal and opposite force on A.
