Friction is a contact force that acts in the opposite direction of motion.

Which statement correctly explains the amount and direction of the net force?

The net force is 0N and the rope will not move in either direction.

Does the picture show a scientific phenomenon?

Yes. leaves changing colors and falling is natural and observable.

Do the diagrams show balanced or unbalanced forces?

Both diagrams show unbalanced forces.

Explain if the forces shown are balanced or unbalanced?

The forces are unbalanced because the net force is 900N to the right.

Which is an example of a force pushing downward toward the ground?

A bird sat on a telephone wire.

a place or object used to to determine if something is in motion.

Which observation about the picture is qualitative?

There are different colored balloons.

When is an object in motion?

when the net force is unbalanced, or nonzero

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Force and Motion Review

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Questions 18

Answers

1
What is friction?
Friction is a genre of book.
Friction is a force that pulls objects towards eachother.
Friction is a contact force that acts in the opposite direction of motion.
Friction is the combination of all the forces on an object.
2
Which statement correctly explains the amount and direction of the net force?
The net force is 20N and the rope will move up.
The net force is 0N and the rope will move to the left then the right.
The net force is 0N and the rope will not move in either direction.
The net force is 100N and the rope will move up.
3
What is a force?
the Newton
a push or pull
the combination of all numbers
a place or object used for comparison
4
Suppose you are riding in the train. From which reference point would the train not appear to be moving?
the cars parked on the street
the telephone pole
someone sitting next to you
the tree
5
Does the picture show a scientific phenomenon?
No, leaves changing colors is not a natural, observable occurrence.
Yes. leaves changing colors and falling is natural and observable.
6
Which equation shows a balanced net force?
8N up and 8N down
46N to the left and 9N to the left
20N to the right and 20N to the right
70N to the left and 7N to the right
7
Do the diagrams show balanced or unbalanced forces?
The top picture is unbalanced and the bottom is balanced.
Both diagrams show balanced forces.
Both diagrams show unbalanced forces.
The top picture is balanced and the bottom is unbalanced.
8
Explain if the forces shown are balanced or unbalanced?
The forces are balanced because they are both 450N to the right.
You can't tell if the forces are balanced.
The forces are unbalanced because the kid is yawning.
The forces are unbalanced because the net force is 900N to the right.
9
Which of the following is a contact force?
electrical forces
gravity
friction
magnetism
10
Which is an example of a force pushing downward toward the ground?
A bird sat on a telephone wire.
A student picked a pencil up off the ground.
A dog tugged on a leash held by a child.
A passenger opened a car door.
11
A reference frame is
a place or object used to to determine if something is in motion.
the frame surrounding your pictures.
something that shows the difference types of forces.
a synonym for unit of force.
12
Which observation about the picture is quantitative?
There are cattail plants in the picture.
There are clouds in the sky/
There are 8 birds flying.
The sky looks blue and reddish.
13
Which observation about the picture is qualitative?
One balloon is blue.
There are 8 balloons.
There are different colored balloons.
2 balloons say "Happy Birthday"
14
Motion is relative. In this sentence relative means ...
you can't tell what's in motion
related to everything and everyone.
not fixed, not absolute
all of your family is in motion
15
Which example shows friction?
All of the above.
Walking down the street
Writing in your notebook
Tieing your shoe.
16
What is the unit for the strength of a force?
Newton (N)
meters (m)
degrees Celcius (*C)
seconds (sec)
17
Which term best describes the type of force the man is using to tie his shoe?
friction
noncontact force
gravity
contact
18
When is an object in motion?
when friciton and gravity are equal
when the net force is fixed on Earth
when the net force is balanced, or ON
when the net force is unbalanced, or nonzero

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