Newton's 1st law
What is Newton’s First Law also called?
The law of inertia
What is the formula for Newton’s Second Law?
F = m × a
What is Newton’s Third Law?
For every action, there is an equal and opposite reaction
A push or a pull on an object.
force
A car won’t move unless someone pushes it. Which law?
Newton’s First Law
What will happen to an object at rest if no force acts on it?
It will stay at rest.
If you push a lighter object and a heavier object with the same force, which one accelerates more?
The lighter object
When you jump off a boat, why does it move backward?
Action-reaction forces
The amount of matter in an object.
mass
A student pushes a box (10 kg) and it accelerates at 0.5 m/s². What force did the student apply?
5 N
A ball rolling on grass slows down. What force is acting on it?
friction
A 2 kg object accelerates at 3 m/s². What is the force?
6 N
A balloon flies around the room when you let it go. What is the action and reaction?
Air goes out (action), balloon moves forward (reaction)
A measure of how fast something changes speed.
acceleration
A 50 kg object accelerates at 2 m/s². What’s the net force?
100 N
Why do you lurch forward in a car when it stops suddenly?
Your body wants to keep moving – inertia
How does mass affect acceleration if the force is constant?
More mass = less acceleration
If you apply a force of 20 N to a wall, how much force does the wall exert back on you?
20 N — The wall exerts an equal and opposite force according to Newton’s Third Law.
The resistance of an object to a change in motion.
inertia
A bicycle speeds up from 0 m/s to 10 m/s in 5 seconds. What is its acceleration?
2 m/s² — The bicycle's acceleration is (10 m/s - 0 m/s) ÷ 5 seconds = 2 m/s².
Two students push a box. One pushes with 50 N and the other with 30 N from the opposite side.
What kind of force is this, and what happens to the box?
Unbalanced force — the box moves in the direction of the stronger push (50 N).
A 10 N force causes an object to accelerate at 5 m/s². What is its mass?
2 kg
If you push a 2 kg box with a force of 30 N, what force does the box exert back on you?
30 N — The box exerts an equal and opposite force (action and reaction).
The force that resists motion between two surfaces.
friction
What is the kinetic energy of a 2 kg object moving at a speed of 4 m/s?
16 Joules — KE = ½ * 2 kg * (4 m/s)² = 16 Joules