Newtons Laws Flashcards
What is Newton’s first law
If the resultant force on a stationary object is zero the object will remain stationary
If the resultant force on a moving object is zero it will carry on moving at the same velocity
What will a non-zero resultant force produce
Acceleration or deceleration in the direction of the force
Newton’s second law
How are acceleration and resultant forces related
They are proportional
So the larger the resultant force on a object means …
The more the object will accelerate
How are acceleration and mass related
They are inversely proportional
So the larger the mass the smaller the acceleration
What is the formula used for Newton’s second law
Resultant force = mass x acceleration
What is inertia
The tendency for motion to remain unchanged
The tendency to continue in the same state of motion
What does an objects inertial mass measure
How difficult it is to change the velocity of an object
How do you find inertial mass
By Newton’s second law and rearranging it to find mass
M = force / area
What does Newton’s 3rd law say
When 2 objects interact the forces they exert on each other are equal and opposite
If skater A pushes Skater B what forces will they she feel
An equal and opposite force from skater Bs hand
How will both skaters accelerate away from each other if the forces are equal
Both skaters feel the same sized force but in opposite directions
What does it mean is skater A has a smaller mass than skater B
Skater A will be accelerated more because she has a smaller mass so a = f/m
What is an example of Newton’s third law in a equilibrium situation
A man pushing on a wall
As the man pushes there is a normal contact force acting back in him
The two force are the same size
The wall pushes back on him with an equal force
