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? (hint: think about what you are calculating in Newton's 2nd Law)
Newtons (N)
An action-reaction pair always has this many objects in it?
Two (2)
Forces from surfaces rubbing
Friction
A cannonball fires from a cannon, which pushes the cannon backward.
Third Law
You push a locked door with 50 N inward. 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?
Action: pushing your foot on the ground down
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 to the right what is the reaction?
The wall pushing you to the left
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 cause the reaction of the air forcing the helicopter's blades to move upwards, known as lift.
What is the action that caused the air to push back in the first place?
The blades force the air down
Inversely proportional
To move a 5,000 kg satellite from a low orbit to a higher one, engineers use this law to calculate the exact force a thruster must apply to produce the required acceleration
Second Law