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Name:__________________
Block: ____
Date: ___/___/______
Review for Newton’s Law (focus on 2nd Law)
Topic Covered:
Forces and Interactions, Inertia and Force, F=ma, Friction, Forces Come in Pairs
A) Quantities, units, and symbols
1) The quantity, its symbol, its standard international unit, and its unit’s symbol are
represented in the following table. Fill the blanks by following the example. On the
last column write a V if the quantity is vector and S if the quantity is a scalar. Note
some units could correspond to more than one quantity.
Quantity
Symbol
Unit
Unit’s symbol
V for vector or S
for scalar
force
F
Newton
N
V
acceleration
g
v
kilogram
B) Newton’s Laws
2) A car is experiencing a 600 Newton force to the left. (This is the force that the tires
and the road together produce.) The car is also experiencing a 200 Newton frictional
force to the right.
a. Draw a free-body diagram of the car.
b. What is the net force acting on the car? Be sure to include direction.
c. If the car has a mass of 800 kg, what is the acceleration of the car? Show your
work!
3) Ms. Chen saw lots of snow piled on top of his car; she was feeling lazy so she didn’t
clear the snow off the top. When she came to a sudden stop on a highway, all the
snow pile moved onto the hood of his car and blocked his vision. Why? Use
Newton’s Laws to Explain Your Answer.
4) When you are falling towards the Earth, is the Earth falling towards you? Why or
Why not?
5) A 2 kg mass has an acceleration of 4 m/s2. What net force must be acting on it?
SHOW YOUR WORK!
6) A 2 kg mass has a net force of 10 N acting on it. What is its acceleration? SHOW
YOUR WORK!
7) A net force of 5 N causes an object to have an acceleration of 1 m/s2. What is the
mass of the object? SHOW YOUR WORK!
8) When a car is turning the corner, what is the object that provides the net force
making the car turn? What type force is that (gravity, spring, tension, friction, air
resistance, normal)? Which direction is that net force?
9) Vector, Scalar! One of the three quantities listed here are two vectors? Which ones?
Net Force
Mass
Acceleration
10) A 2000-kg truck is moving, and its motion is shown in the graph below.
v (m/s)
50
40
30
20
10
0
t (s)
0
4
8
12
A. How much braking force is applied to the truck during the ten seconds shown? SHOW
YOUR WORK!
11) Practice: Open-response MCAS Question
BE SURE TO ANSWER AND LABEL ALL PARTS OF THE QUESTION.
Show all your work (diagrams, tables, or computations)
If you do the work in your head, explain in writing how you did the work.
The figure below is a graph of net force vs. the acceleration of an object.
a. Use the graph to determine the mass of the object. Show your calculations and
include units in your answer.
b. What acceleration will the object have if the net force is 50 N and the trend shown by
the graph continues? Show your calculations and include units in your answer.
c. On the grid in your Student Answer Booklet, draw a graph of force vs. acceleration if
the mass of the object is halved and the object is subjected to the same net forces. Label
the axes on your graph and be sure to include units. Label this graph “c.”
d. On the same axes that you used in part (c), draw a graph of force vs. acceleration if
the mass of the object is doubled and the object is subjected to the same net forces. Label
this graph “d.”
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