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UNIT 6 Part 2 – “Mini- Quiz” Review ANSWER KEY
Newton’s Laws of Motion
VOCABULARY
In your own words, write a definition of the following terms in the space provided.
Inertia: The tendency of all objects to resist any change in motion
1.
2. Newton’s 1st Law: An object at rest remains at rest, and an object in motion remains in motion at
constant speed and in a straight line unless acted on by an unbalanced force.
3. Newton’s Second Law (in words and formula): The acceleration of an object depends on its mass and
the force acting on it.
F=mXa
4. Newton’s Third Law: . All forces act in pairs. For every action there is an equal and opposite
reaction.
5. Friction: a common unbalanced force acting on objects in motion
6. Provide 2 examples of Newton’s First Law:
Beaker of marbles stays in place when cloth pulled out from it because of the inertia it has.
Toy flies from car when car stops suddenly.
7. Provide 2 examples of Newton’s Second Law:
The truck with more mass accelerates slower than the lighter mass truck when the same force is
applied.
It is harder to push a full shopping cart than an empty one.
8. Provide 2 examples of Newton’s Third Law
A rocket taking off (thrusters push gases down & gasses push up)
A rabbit jumping ( feet on ground, ground on feet)
9. Provide 3 examples of force pairs that occur when you do your homework.
Hand on pencil (action), pencil on hand (reaction) to write
Book on desk(action), desk on book (reaction) book stays on desk
Hand on page of book(action) page on hand(reaction) to turn a page in a book
10. Which of the following will increase the acceleration of an object that is pushed by a force?
a. decreasing the mass of the object
b. increasing the mass of the object
c. increasing the force pushing the object
d. Both (a) and (c)
10.
Use Newtons’ first law of motion to explain why airbags in cars are important during headon collisions.
When you are traveling in a car you are traveling at the same rate of speed as the car. If
the car gets in a head on collision, it will stop because of the force of the other car
hitting it. You will continue to travel until a force acts on you because of your inertia. It
is important to have airbags to protect you from hard objects like the dashboard or
windshield so that if you move forward even in the seatbelt, the airbags are more of a
cushion and will help protect you from injury.
11. Imagine you accidentally bumped your hand against a table. Your hand hurts after it
happens. Use Newton’s third law of motion to explain what caused your hand to hurt.
The third law says that for every action there is an equal and opposite reaction. If you hit
your hand on a desk, your hand exerts a force on the desk and the desk exerts a force
back on you hand which will stimulate your nerve cells and cause pain.