Introduction to Forces and Free Body Diagrams

Quiz
•
Science
•
8th Grade
•
Hard
Standards-aligned
Lisa Thompson
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Look at the following steps for drawing a free-body diagram, and determine what Step 4 should be:
Draw in an arrow for the net force
Calculate the acceleration using the mass of the object
Draw all of the objects that are pushing / pulling at the ends of the arrows
Make sure the length of each arrow correctly represents the strength of the force
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A student is analyzing the forces on a 400 kg car driving at a constant velocity of 20 m/s. What is wrong with the student's force diagram?
The forward force should be 20 N rather than 8000 N since Fnet = m·a
The diagram shows a net force but the net force on the car should be zero
There cannot be any forces on the car if it has a constant velocity so there should be no arrows
There should be more backward force on the car because the care is slowing down
Tags
NGSS.MS-PS2-2
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The force that keeps objects on top of surfaces instead of letting them sink into the surface is known as:
normal
abnormal
static
inertia
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt

A person stands on a scale in an elevator. If the elevator accelerates upward, what happens to what the scale reads (i.e. the normal force)?
It increases.
It stays the same.
It decreases.
It changes to a negative value.
Tags
NGSS.MS-PS2-1
NGSS.MS-PS2-2
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A man standing on a scale in an elevator notices that the scale reads 40 newtons greater than his normal weight. Which type of movement of the elevator could cause this greater-than-normal reading?
moving downwards and slowing down
moving upwards and slowing down
moving upward at a constant speed
moving downward and speeding up
Tags
NGSS.MS-PS2-2
6.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
What does the F stand for on a free-body diagram?
Free
Fan
Net
Force
Tags
NGSS.HS-PS2-1
7.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
What is the NET FORCE of this diagram?
17 N, right
17 N, left
23 N, right
12 N, up
Tags
NGSS.MS-PS2-2
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