AnswersAL Physical Science AIntroduction to Forces

Introduction to Forces Answers

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Which best describes two counteracting forces on an object?

A
using a dolly to push a box to another location
B
two children pulling apart a wishbone
C
a group of dogs pulling a dogsled across ice
D
two people pushing a broken-down car up the road
2
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Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor?

A
Fp
B
Ff
C
FN
D
Fg
3

Haley is trying to pull an object upward. The below forces are acting on the object.Fp= 5500 NFg= 6000 N

A
← 500 N
B
→ 500 N
C
↑ 500 N
D
↓ 500 N
4

Two boxes need to be moved into storage. Jamal and Jude each want to move a box. The force of gravity on both the boxes is 50 N. Jamal is lifting with a force of 60 N, and Jude is lifting with a force of 45 N.

A
Jamal moved his box to storage, but Jude could not move his.
B
Jamal and Jude can successfully move each box into storage.
C
Jamal could not move his box to storage, but Jude could.
D
Neither Jamal nor Jude could move the boxes into storage.
5

Polly is pushing a box to the right across the floor with a force of 30 N. The force of gravity is 8 N, and the normal force is 8 N. Which value could describe the force of friction if Polly could not move the box?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
6

Emmett is lifting a box vertically. Which forces are necessary for calculating the total force?

A
Fp, Ff, and Fg
B
Fp and FN
C
Fp, FN, and Ff
D
Fp and Fg
7

Diego is trying to lift a piano to the second floor of his house. Diego uses a pulley system and gives a big lift to the piano.The piano moves upward, then stops, and then it starts to fall to the ground. (The direction of the force of gravity is negative.)

A
positive force → balanced force → negative force
B
negative force → balanced force → positive force
C
positive force → unbalanced force → negative force
D
negative force → unbalanced force → positive force
8

If forces acting on an object are unbalanced, which factor may result from an unbalanced force?

A
The net force is negative.
B
There is zero net force.
C
The forces cancel each other out.
D
There is no change in motion.
9

Which best explains parallel forces?

A
left and right forces that can be added together
B
right and upward forces that cancel each other out
C
addition of parallel forces that cannot result in a negative force
D
left and downward forces that cancel each other out
10

Which force best represents Fg?

A
A weight lifter is pushing a barbell upward with a force of 90 N.
B
The weight of a barbell acting on a weight lifter is 80 N.
C
The amount of upward force of a table on a box is 25 N.
D
A box on a rough table has difficulty sliding past 25 N of force.

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