AnswersAL Physical Science AIntroduction to Forces

Introduction to Forces Answers

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The table represents the forces on four objects, with directions.ObjectF1 ↑F2 →F3 ←F4 ↓W30 N20 N20 N30 NX15 N35 N25 N15 NY60 N0 N0 N60 NZ45 N0 N22 N45 N

A
Objects W and X have balanced forces, and objects Y and Z have unbalanced forces.
B
Objects W and Y have balanced forces, and objects X and Z have unbalanced forces.
C
Objects X and Y have balanced forces, and objects W and Z have unbalanced forces.
D
Objects X and Z have balanced forces, and objects W and Y have unbalanced forces.
2
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Jasper and Gemma are going to play on a teeter totter. Gemma gets on first. When Jasper gets on, Gemma moves into the air, but she does not move to the top.

Question illustration
A
The forces are balanced because Jasper weighs the same as Gemma.
B
The forces are unbalanced because Jasper weighs the same as Gemma.
C
The forces are balanced because Jasper weighs more than Gemma.
D
The forces are unbalanced because Jasper weighs more than Gemma.
3

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
4

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.
5

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.
6

Which is the best example of forces acting in the same direction?

A
a boy lifting his chest off the ground during a pushup
B
two football players pushing a tackling sled
C
a person pulling out a garden hose from its reel
D
two dogs playing tug-of-war with a rope
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

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
9

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.
10

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

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