Forces and Motion | 2 Flashcards
Speed
Distance/time
Acceleration
Change in Velocity/ time
m/s^2
Gradient
Rise / run
Force (2)
Mass x Acceleration
Change in momentum / time
weight (formula)
mass x g
Momentum
Mass x velocity
(vector)
Vector
Magnitude + direction
e.g Velocity
+10 m/s = right
- 10 m/s = left
Distance time graph
Gradient = speed
Speed time graph
gradient = acceleration
area under line = distance travelled
Free Fall
Falling without air resistance and any other drag producing factors at the same speed as gravity
Newton 1st law
if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by an external force.
Inertia
Resistance of a change in velocity
more the mass , more the inertia
more the inertia , more difficult it is for a change in velocity
Friction
resistance of the motion of 2 objects sliding against each other
Heats objects up by turning kinetic energy into thermal when it moves against friction
Drag is friction is liquids or gases
Explain differences between static and dynamic friction
Static friction is greater than dynamic friction and works whe the object is about to start moving , opposed to when the object is moving
Newton 3rd law
To every action there is a equal and opposite reaction
