Law of Inertia
This is Newtons 1st law of Motion?
An object at rest will stay at rest, and an object in motion will stay in motion unless acted upon by an unbalanced force.
This is how many laws of motion Newton created.
What is 3 Laws of Motion?
State Newton's 3rd Law of Motion.
For every action, there is an equal and opposite reaction.
This term describes any push or pull acting on an object.
Force
A book sitting on a table is an example of which of Newton’s Three Laws of Motion?
1st Law (Law of Inertia)
You slide a hockey puck across the ice, and it eventually stops. Name the unbalanced force that caused it to stop.
Friction
If you apply a force of 10 N to a 2 kg object, calculate the acceleration.
5 m/s2
A swimmer pushes backward on the water with her arms. What is the reaction force?
Reaction force: the water pushing the swimmer forward.
The sum of forces acting on an object.
Net Force
What is the mathematical formula used to express Newton’s Second Law of Motion?
F=ma (Force=mass x acceleration)
When a car suddenly brakes, your body continues forward because your body wants to maintain its state of
Motion
Two shopping carts are pushed with the same force. Cart A is 5 kg, and Cart B is 10 kg. Which cart accelerates faster, and why?
Cart A, because less mass means more acceleration for the same force
A rocket launches by pushing exhaust gases downward. Identify both the action force and the reaction force in this scenario.
Action Force: Rocket pushing gas downward
Reaction Force: Gas pushing the rocket upwards
Balanced Forces
Why does a rolling soccer ball slow down even if no one touches it?
Friction
The state of motion of an object when all forces are balanced.
Rest (Constant Velocity)
A 1,500 kg car accelerates at 3 m/s².
Calculate the net force acting on the car.
4,500 N
This is another name for Newton's Third Law.
The Action-Reaction Law
Forces that cause a change in motion
Unbalanced Forces
True or False: An object moving at constant speed in a straight line has a net force of zero acting on it.
True
Two objects float in deep space with zero forces acting on them. Object A has a mass of 5 kg, and Object B has a mass of 500 kg. Both are at rest. Which is harder to set in motion and why?
Object B because it has a higher mass. Higher mass = more force needed to move it.
If you double the force on an object AND double its mass at the same time, what happens to the acceleration?
It stays the same.
A 60 kg skater pushes a 30 kg skater.
Who experiences the greater force?
Neither.
According to Newton’s Third Law, for every action, there is an equal and opposite reaction. When the 60 kg skater pushes, the 30 kg skater pushes back with the same force in the opposite direction.
The difference you'd see is in their acceleration: since the 30 kg skater has less mass, they will accelerate twice as fast as the 60 kg skater.
The tendency of an object to resist changes in its state of motion.
Inertia
What else is Isaac Newton known for?
(50 bonus points if you know the name of the law)
Gravity
(Bonus: Law of Universal Gravitation)