AnswersMO-Physical Science A-CRLab: Motion

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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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
3

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
4

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.
5

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
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

If forces acting on an object are unbalanced, the object could experience a change in ________.

A
mass, speed, or direction
B
negative acceleration or mass
C
direction, mass, or both
D
speed, direction, or both
8

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.
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

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

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