Newton's 1st Law of Motion
This law states that an object at rest stays at rest unless acted on by this.
This formula shows the relationship between force, mass, and acceleration.
F = M x A
Newton’s 3rd Law states that for every action there is one of these.
An equal and opposite reaction
When forces on an object are equal in size and opposite in direction, they are called this.
Balanced forces.
Net force is the combination of all these acting on an object.
Forces
The reason your backpack keeps sliding forward when the car stops suddenly.
Inertia
If you push two objects with the same force, the one with less mass will have more of this.
Acceleration.
Forces always come in...
Pairs
Balanced forces cause this kind of motion.
No change in motion.
If forces act in the same direction, you do this to find net force.
Add them
Another name for Newton’s 1st Law.
Law of Inertia
According to Newton’s 2nd Law, increasing mass will cause acceleration to do what (when force is the same)?
Decrease acceleration.
The sizes of the forces in this law are what?
The same.
When forces are unbalanced, an object must do one of these three things.
Speed up, slow down, or change direction (accelerate)
12 N right and 5 N left act on a toy car. State the net force and direction.
7 N right
A bowling ball is harder to push than a tennis ball because it has more of this.
Mass (More mass = more inertia)
A shopping cart accelerates when you push it because of this law. Name the law and the variable that increases.
Newton's 2nd law and acceleration.
What is the name of the model Newton invented to prove this law?
Newton's cradle
A box has two opposite forces: 10 N right and 10 N left. Is the motion changing? Why or why not?
No, the motion is NOT changing because the forces cancel out (net force = 0).
What is the net force if two students push a box 20 N east and 20 N west?
0 N (They cancel out)
What can be the outside force that stops something sometimes?
Friction.
What does mass equal?
The amount of matter and inertia.
A rocket takes off because gases push down. What pushes the rocket upward?
The gases push the rocket upward.
Force is represented as what?
Newtons (N)
What type of balance is a result of a net force of zero (0 N)?
Balanced force.