AnswersAA-F26 Physical ScienceLab: Motion

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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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
3

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
4

An object is moving across a surface, but it does not gain or lose speed. Which best describes the object’s force?

A
The net force is positive.
B
The net force is zero.
C
The positive force is greater than the negative force.
D
The negative force is greater than the positive force.
5

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
6

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.
7

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
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

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.
10

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

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