1st Law
What is another name for Newton’s 1st Law?
The law of _______________
inertia
What is the formula for Newton’s 2nd Law?
F = MA
State Newton’s 3rd Law.
For every action, there is an equal and opposite reaction.
What force pulls everything toward Earth’s center?
Gravity
What does “m/s²” measure?
Acceleration
According to Newton’s 1st Law, what happens to an object at rest if no outside force acts on it?
It stays at rest
If you double the force on an object, what happens to its acceleration?
It doubles
When you jump off a boat, why does the boat move backward?
Your push on the boat causes an equal and opposite reaction
What kind of force resists motion between two surfaces?
Friction
If an object moves at a constant speed in a straight line, what is its acceleration?
Zero
You’re riding in a car and it suddenly stops — why does your body move forward?
Inertia
If you double the mass but keep the same force, what happens to acceleration?
It is cut in half
What two forces are involved when a rocket launches?
The rocket pushes gases down, gases push the rocket up
Name a type of friction that occurs between air and a moving object.
Air resistance
If a 10 N force moves a 5 kg object, what’s the acceleration?
2 m/s2
Name one force that can overcome inertia and change an object’s motion.
friction, gravity, push or pull
A 2 kg object accelerates at 3 m/s². What is the force?
6 Newtons
Why do you feel a recoil when firing a Nerf gun?
The dart pushes forward, and the gun pushes backward with equal force
Why do astronauts float in space even though gravity exists?
They are in free fall around Earth (microgravity)
A 3 kg cart accelerates at 4 m/s². What is the net force?
12 Newtons
If you kick a soccer ball on grass, why does it stop instead of rolling forever?
Friction slows it down, overcoming inertia
Why do heavier objects need more force to move?
They have more mass (inertia), so they resist motion more
Explain how walking uses Newton’s 3rd Law.
Your foot pushes backward on the ground; the ground pushes you forward
What is the difference between balanced and unbalanced forces?
Balanced = no motion change; Unbalanced = causes acceleration.
A 50 N force moves two objects: one 5 kg and one 10 kg. Which accelerates faster?
The 5 kg object