Motion
This is defined as how fast an object is moving.
Speed
This force pulls all objects toward the Earth.
Gravity
When two forces acting on an object are equal in size and opposite in direction, these forces are called __________.
Balanced Forces
Newton's First Law is also called the Law of __________.
Inertia
When a car stops suddenly and you lurch forward, which Newton's Law explains this?
Newton's 1st Law
This describes how fast an object is moving AND in which direction.
Velocity
This force opposes motion between two surfaces in contact.
Friction
When forces on an object are NOT equal, they are called __________ forces, and the object will change its motion.
Unbalanced Forces
According to Newton's Second Law, if you apply more force to an object with the same mass, what happens to its acceleration?
It increases.
A rocket launches by pushing gases downward. The gases push the rocket upward. Which law explains this?
Newton's 3rd Law
This occurs when an object's speed or direction changes over time.
Acceleration
When you push a book across a table, this is the type of force you are applying.
Applied Force
A 10N force pushes right and a 10N force pushes left on the same object. What is the net force?
0 Newtons
State Newton's Third Law.
For every action there is an equal and opposite reaction.
In your balloon car, the balloon released air in one direction and the car moved in the opposite direction. Name the Newton's Law.
Newton's 3rd Law
A car is traveling north at 40 mph. Another car is traveling south at 40 mph. They have the same speed but different __________.
Velocities
Q4: This force acts on objects moving through the air and slows them down.
Air Resistance
A 15N force pushes right and a 5N force pushes left. What is the net force and in which direction?
10 Newtons to the right.
A soccer ball is rolling across grass and eventually stops. Which Newton's Law explains this, and what force caused it to stop?
Newton's 1st Law and Friction
Two students are on rolling chairs facing each other. One pushes the other. What happens to BOTH students and which law explains it?
Both students move in opposite directions and Newton's 3rd Law
You are sitting on a bus and feel like you are not moving, but someone on the sidewalk sees you moving. This difference in perspective is called __________.
Frame of Reference
This is the force a surface exerts to support an object resting on it, pushing perpendicular to the surface.
Normal Force
A book is sitting still on a desk. What does this tell you about the forces acting on it?
The forces are balanced.
You push a heavy shopping cart and a light shopping cart with the same force. Which accelerates more and why?
The light shopping cart because it has less mass. (Newton's 2nd Law)
A skateboarder pushes off the ground and rolls down a hill, speeding up as they go. Describe how all three of Newton's Laws are present in this scenario.
1st Law — the skateboarder was at rest until an unbalanced force acted on them.
2nd Law — as they roll downhill, the force of gravity causes them to accelerate.
3rd Law — when they pushed off the ground, the ground pushed back on them with equal and opposite force.