First Law
What is another name for Newton's First Law?
The Law of Inertia
What is the equation for Newton’s Second Law?
F = m × a
Complete Newton’s Third Law: "For every action, there is an equal and ______ reaction."
Opposite
Action: A person pushes down on the ground.
What is the reaction?
The ground pushes upward on the person.
Which Newton’s Law explains why passengers wear seatbelts?
Newton's First Law
According to Newton’s First Law, an object at rest will stay at rest unless what happens?
An unbalanced force acts on it
What unit is used to measure force?
Newtons (N).
A student pushes on a wall. What does the wall do?
The wall pushes back on the student with an equal and opposite force.
Action: A rocket pushes exhaust gases downward.
What is the reaction?
The exhaust gases push the rocket upward.
Which Newton’s Law explains how force, mass, and acceleration are related?
Newton’s Second Law.
A soccer ball is sitting still on the grass. What will happen if no unbalanced force acts on it?
It will remain at rest.
A 5 kg object accelerates at 2 m/s². What is the net force?
10 N
A swimmer pushes water backward. What does the water do?
The water pushes the swimmer forward.
Action: A bird pushes air downward with its wings.
What is the reaction?
The air pushes the bird upward.
Which Newton’s Law explains how a rocket moves upward?
Newton’s Third Law.
A hockey puck slides across the ice and eventually stops. What force causes it to stop?
Friction
If the force on an object increases while its mass stays the same, what happens to its acceleration?
The acceleration increases.
Why don't action and reaction forces cancel each other out?
They act on different objects.
Action: A skateboarder pushes backward against the ground.
What is the reaction?
The ground pushes the skateboarder forward.
A 10 kg object is pushed with a net force of 50 N. What is its acceleration?
5 m/s²
Ms. Kaser pushes on a box with 10N to the left, and Mr. Leffert pushes the box 20N to the right. Which direction will the box travel and what force is there?
10N to the Right
Two objects are pushed with the same force. One has a mass of 5 kg and the other has a mass of 20 kg. Which object will have greater acceleration?
The 5 kg object.
A large truck crashes into a small car. Which vehicle exerts the greater force during the collision?
Neither. They exert equal and opposite forces on each other.
Action: A hammer pushes downward on a nail.
What is the reaction?
The nail pushes upward on the hammer.
A student kicks a soccer ball. Identify the action and reaction forces and name the Newton’s Law involved.
Action: The student's foot pushes the soccer ball.
Reaction: The soccer ball pushes back on the student's foot.
Law: Newton’s Third Law.