AnswersDL Physical Science A switched content 2023Unit Test

Unit Test — Unit test Answers

25 verified answers2 views
1
Free Preview

An object has a mass of 5 kg. What force is needed to accelerate it at 6 m/s2? (Formula: F=ma)

A
0.83 N
B
1.2 N
C
11 N
D
30 N
2
Free Preview

A skydiver falls toward the ground at a constant velocity. Which statement best applies Newton’s laws of motion to explain the skydiver’s motion?

A
An upward force balances the downward force of gravity on the skydiver.
B
The skydiver’s inertia is zero, which no longer allows for acceleration.
C
An unbalanced force pulls the skydiver toward the ground.
D
The mass of the skydiver is so great that there is no acceleration.
3

Which would be represented by FN on a force diagram?

A
Northern Force
B
Newton Force
C
Normal Force
D
Negative Force
4

Which refers to the force that one massive object exerts to attract another object?

A
velocity
B
gravity
C
acceleration
D
newton
5

Which change will cause the gravitational force between a baseball and a soccer ball to increase?

A
removing the outer layer of the baseball
B
moving the balls farther apart
C
wrapping the soccer ball in layers of duct tape
D
using a baseball with a thinner leather
6

The resulting net force of an object is represented below. →10 NWhich most likely represent the forces acting on the object?

A
↑ 63 N and ↓ 73 N
B
↑ 97 N and ↓ 87 N
C
← 63 N and → 73 N
D
← 97 N and → 87 N
7

While drilling metal, Ben poured oil over the area. Which best explains why he did this?

A
Ben was trying to reduce fluid friction.
B
Ben was trying to reduce kinetic friction.
C
Ben was trying to increase fluid friction.
D
Ben was trying to increase kinetic friction.
8

Which is an example of sliding friction?

A
a car’s wheels rolling down the road
B
a bird flying through the air
C
a child applying the brakes on his bike
D
a bowling ball rolling down a lane
9

Which may result from an increase in friction?

A
decreased traction
B
increased speed
C
reduced wear and tear
D
generation of heat
10

Which refers to the sum of all the forces that act upon an object?

A
absolute force
B
net force
C
positive force
D
balanced force
11

Which statement correctly describes gravity?

A
an attractive force that acts between all objects through contact
B
an attractive force that acts between all objects without contact
C
a repulsive force that acts between all objects through contact
D
a repulsive force that acts between all objects without contact
12

An object in projectile motion will follow which path?

A
curved up from the ground
B
curved down toward the ground
C
straight down toward the ground
D
straight up from the ground
13

Newton’s first law of motion was a giant leap forward in scientific thought during Newton’s time. Even today, the idea is sometimes difficult at first for people to understand.

A
A rolling ball eventually slows down and comes to a stop.
B
A wagon must be pushed before it begins to move.
C
The heavier the load in a cart, the harder the cart is to turn.
D
A box does not move when pushed equally from opposite sides.
14

Which factors can affect the amount of friction acting on an object on a solid surface?

A
the weight of the object and the force of a push
B
the type of surface and the weight of the object
C
the force of a push and the motion of the object
D
the motion of the object and the type of surface
15

Which example best represents balanced forces?

A
an elevator stopped on the third floor
B
a basketball shot into a hoop
C
a sled sliding down a snowy hill
D
a tow truck pulling a car out of a ditch
16

When discussing Newton’s laws of motion, which terms do people most likely use when talking about Newton’s third law of motion?

A
“force” and “acceleration”
B
“inertia” and “force”
C
“action” and “reaction”
D
“mass” and “inertia”
17

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.
18

Charlie is investigating friction. She will use the same amount of force to push two wooden balls across two level surfaces. Then she will record her results in the table below.Which prediction will most likely describe how friction will affect her findings?

Question illustration
A
The distance for Trial 3 will be greater than the distance for Trial 1 partly because the weight difference of the balls will affect friction.
B
The distance for Trial 2 will be greater than the distance for Trial 1 because the difference in surface roughness will affect friction.
C
The distance for Trial 4 will be greater than the distance for Trial 2 partly because the weight difference of the balls will affect friction.
D
The distance for Trial 3 will be greater than the distance for Trial 4 because the difference in surface roughness will affect friction.
19

According to Newton’s first law of motion, when will an object at rest begin to move?

A
when its inertia decreases to zero
B
when an unbalanced force acts upon it
C
when the action and reaction forces are equal
D
when two equal and opposite forces act upon it
20

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

Did you find these answers helpful?

More from this Course

Quiz
25 verified answers

Unit Test

Quiz
25 verified answers

Unit Test

Quiz
25 verified answers

Unit Test