Newton's laws Flashcards
Newton’s first law
If the resultant force of an objects is 0 it is either stationary and will remain stationary or it is moving and will continue at the its current velocity (yes direction actually matters)
Newton’s second law
F=ma
(resultant force (N)= mass(kg) * acceleration(m/s^2)
Newton’s third law
When two objects interact the force they exert on each other is equal and opposite (e.g. I standing on the earth is the earth pulling you towards it with the same strength of you pulling the earth towards you)
Inertial mass
measure how difficult it is to change an object’s velocity
Formula for acceleration
v(final velocity)- u(initial velocity)/t(in seconds)
difference between speed and velocity
speed= distance/time (scalar just magnitude)
velocity= displacement/time(vector so magnitude and direction)
Distance time graph
Gradient= speed (curve means draw a tangent because acceleration)
Flat line= stationary
negative gradient= returning to start
Velocity time graph
Gradient= acceleration (also draw lines in a curve)
Flat line= constant velocity
negative velocity= either slowing down or returning to origin
Area under line= distance travelled
Speed time graphs
Gradient= acceleration
flat line= constant speed
negative gradient= slowing down
area under line= distance travelled
3rd equation of motion/ also used to calculate braking
DONT NEED TO MEMORISE JUST KNOW WHAT IT DOES
v^2-u^2=2as
(((final velocity)^2-(initial velocity)^2)= 2* acceleration* distance)
Resultant force
the net force acting on an object
How to work out resultant force
Tip to tail diagram where you draw the arrows exactly as shown in the diagram but where the back end of one of the arrows is pointed by the front end of another (remember to keep side lengths and angles the same) the connect the two open ends and measure to get the resultant force
Its okie if you don’t understand my gobldygoop but if you don’t get it I can explain
Horizontal and vertical components
Work the same way as resultant force but use the resultant force to make a triangle and measure
formula for weight
Weight= mass* gravitational field strength
When skydiving when are you accelerating the most
Your velocity will continue to increase, but your acceleration is fastest at the start as only weight is acting
Velocity will increase at a decreasing rate
