Newton’s 2nd Law
What is the formula for Newton’s 2nd Law?
F = m × a
State Newton’s 3rd Law.
Every action has an equal and opposite reaction.
A book sits still on a desk. Balanced or unbalanced?
Balanced
10 N right and 5 N right. What is the net force?
15 N right
Which law explains why your body jerks forward when a car stops suddenly? 1, 2, or 3?
Newton’s 1st Law (inertia)
If you double the mass but keep the force the same, what happens to the acceleration?
Acceleration is cut in half.
When you jump, your feet push down on the ground. What is the reaction force?
The ground pushes you upward.
A car speeds up on the highway. Balanced or unbalanced?
Unbalanced
20 N left and 10 N right. Net force?
10 N left
Which law connects force, mass, and acceleration?
Newton’s 2nd Law
A 10 kg object accelerates at 3 m/s². What force is applied?
30 N
A rocket launches upward. What is the reaction force?
Gases push downward out of the rocket.
Two students push a box: 50 N left and 50 N right. Balanced or unbalanced?
Balanced
15 N right, 15 N left. Net force?
0 N
A force diagram shows unequal arrows. What type of forces are acting?
Unbalanced
Why is it easier to push an empty shopping cart than a full one?
Less mass → less force needed to accelerate.
A swimmer pushes water backwards. What happens to the water?
Water pushes the swimmer forward.
A skateboarder slows down due to friction. Balanced or unbalanced?
Unbalanced
A box has 30 N forward and 12 N backward (friction). Net force?
18 N forward
What unit is force measured in?
Newtons (N)
A student pushes a 5 kg box with 20 N of force. What is its acceleration?
4 m/s²
Why doesn’t a book fall through the table?
The table pushes upward with an equal and opposite force.
A hanging sign moves upward at a constant speed while being raised. Balanced or unbalanced?
Balanced (constant speed = balanced).
One student pushes a crate 25 N right. Another pushes 40 N left. A third student pushes 15 N right.
Net force?
0 N
Name a real-life example where all three of Newton’s laws occur together.
Examples: kicking a soccer ball, riding a bike, a rocket launching