AnswersPhysical ScienceForces

Practice Test Answers

10 verified answers
1
Free Preview

A tugboat is pulling a barge into a harbor. The barge is exerting a force of 3000 N against the tugboat. Which force would most likely allow the tugboat to move the barge into the harbor?

A
3000 N in the opposite direction of the barge
B
4500 N in the opposite direction of the barge
C
3000 N in the same direction of the barge
D
4500 N in the same direction of the barge
2
Free Preview

Which best describes friction?

A
a constant force that acts on objects that rub together
B
a downward pull when objects fall through the air
C
a downward pull on objects that roll on bumpy surfaces
D
a constant force that pulls two objects toward each other
3

Which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?

A
a 5kg dining chair
B
a 75kg dining table
C
an 10kg end table
D
a 50kg couch
4

Which best describes a force?

A
a vector with direction only
B
a vector with strength only
C
a vector with magnitude and direction
D
a vector with speed and strength
5

Which describes an object’s speed when free falling in a vacuum?

A
The object speeds up and then stops when air resistance equals gravity.
B
The object falls at a constant speed because only one force acts on it.
C
The object accelerates until it reaches its terminal velocity.
D
The object falls faster and faster until it strikes the ground.
6

Two objects collide and bounce apart. Assuming no outside forces act on the system, which best describes the total momentum after the collision?

A
It is always greater than it was before the collision.
B
It is often the same as it was before the collision.
C
It is always the same as it was before the collision.
D
It is often greater than it was before the collision.
7

Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?

A
decreasing the reaction force
B
increasing the action force
C
increasing the inertia of the car
D
decreasing the mass of the car
8

A scientist on Earth drops a hammer and a feather at the same time an astronaut on the moon drops a hammer and a feather. Which result is expected?

A
The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon.
B
The hammer and the feather hit the ground together on both Earth and the moon.
C
The hammer hits the ground before the feather on Earth, but the feather hits the ground first on the moon.
D
The hammer hits the ground before the feather on both Earth and the moon.
9

Riley is doing an experiment working with friction. He wants to find two ways to modify an object that could increase or decrease the same type of friction. Which methods could he use to perform his experiment?

A
using nonstick materials and ball bearings
B
using lubricants and increasing surface area
C
increasing surface area and aerodynamic design
D
increasing roughness and speed
10

A football player has a mass of 65 kilograms and is moving with a velocity of 5 meters per second What is the player’s momentum?

A
70 kilograms times m over s
B
325 kilograms times m over s
C
305 kilograms times m over s
D
13 kilograms times m over s

Did you find these answers helpful?

More from this Course

lesson pretest
8 verified answers

Pretest

Practice Test Answers — Physical Science