1st Law
Write Newton's 1st Law
An object at rest stays at rest unless a net force acts on them
AND
An object in motion stays in motion at a constant speed in a straight line unless a net force acts on them.
Write Newton's 2nd Law
EF = ma
Write Newton's 3rd Law
For every action there is an equal and opposite reaction
Force
A soccer ball sits on the grass and won't move until a player kicks it.
First Law
What is a common nickname for the First Law?
Law of Inertia
What is the standard unit for your final calculation?
Newtons (N)
An action-reaction force pair always acts on this many objects in it?
Two
Forces from surfaces rubbing
Friction
A cannonball fired from a cannon recoils and pushes the cannon backward.
Third Law
You push a locked door with 50 N in. The door since it is locked is pushing back with 45 N of force. What is the net force on the door?
5 N inward
What is the net force on an object if it has a mass of 5 kg and accelerates at a rate of 3 m/s2?
15 N
What is the reaction force when you walk, pushing your foot down on the ground?
The ground pushing your foot up
Total (after everything is added/subtracted)
Net
You have to push a car a lot harder than a bicycle to get it to accelerate.
Second Law
How can an object be in equilibrium if it is in motion?
If it is moving in a constant speed in a straight line
What is the acceleration of a 10 kg bowling ball if you push it with a 35 N force?
3.5 m/s2
When you push off the wall in a rolling chair, what is the reaction?
The wall pushing you backwards
Amount of force per unit area
Pressure
You're riding a skateboard and hit a small rock. The skateboard stops, but you fly forward.
First Law
Why does your body feel "thrown" against the car door when you take a sharp turn?
Inertia (want to stay at rest or in motion in a straight line in a constant speed)
If you quadruple the mass, what will happen to the object's acceleration?
A helicopter's blades are designed to force air particles down. What is the reaction in this case?
The air forces the blades to move up (lift).
Inversely proportional
A small car and a large truck collide. They both experience the exact same size force (though the damage is different).
Third Law