Newtons 1st Law
What is another name for Newtons 1st Law?
The Law of Inertia
What equation represents Newton's 2nd Law?
F=ma
Complete the statement: "For every action, there is an equal and ______ reaction."
Opposite
You jump off a skateboard and the skateboard rolls backward. Which law?
Newton's 3rd Law
What is the SI unit for force?
Newton (N)
An object at rest will stay at rest, and an object in motion will stay in motion unless acted on by what?
An unbalanced/net force
What happens to acceleration when the net force on an object increases?
Acceleration increases.
When you push against a wall, what does the wall do?
The wall pushes back on you with an equal and opposite force.
A soccer ball stays still until someone kicks it. Which law?
Newton's 1st Law
If the forces acting on an object are balanced, what is the net force?
0 N
A car suddenly stops, but the passengers continue moving forward. Which Newton's Law explains this?
Newton's 1st Law
If the same force is applied to a 5 kg object and a 10 kg object, which object will accelerate more?
The 5 kg object
A swimmer pushes water backward. What happens to the swimmer?
The swimmer moves forward.
It takes more force to accelerate a full shopping cart than an empty one. Which law?
Newton's 2nd Law
If an object has a net force of 0 N, can it still be moving?
Yes. It can continue moving at a constant velocity.
Why do you move forward when a car suddenly stops?
Your body was already moving and tends to continue moving because of inertia.
A 10 kg object experiences a net force of 50 N. What is its acceleration?
5 m/s²
A rocket pushes gases downward. What happens to the rocket?
The rocket moves upward.
Why are seat belts important when a car suddenly stops?
They help keep your body from continuing forward due to inertia.
Two people push a box. One pushes right with 80 N and the other pushes left with 50 N. What is the net force?
30 N to the right
Which has more inertia: a 2 kg bowling ball or a 10 kg bowling ball?
The 10 kg bowling ball because greater mass means greater inertia.
A 20 kg object accelerates at 4 m/s². What is the net force?
80 N
A student says, "The action and reaction forces cancel each other, so objects can't move." Is this correct? Explain.
No. The forces act on different objects, so they don't cancel each other on the same object.
You push an empty shopping cart and a full shopping cart with the same force. Which cart accelerates more and why?
The empty cart because it has less mass, so the same force produces greater acceleration.
A 5 kg object has a net force of 40 N acting on it. What is its acceleration?
8 m/s²