AnswersPhysics in the UniverseForces and Motion

Practice Test Answers

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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
4500 N in the opposite direction of the barge
B
4500 N in the same direction of the barge
C
3000 N in the opposite direction of the barge
D
3000 N in the same direction of the barge
2
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A lab cart with a mass of 15 kg is moving with constant velocity, v, along a straight horizontal track. A student drops a 2 kg mass into it from directly above, and the cart continues moving. Which equation best represents the horizontal momentum in this situation?

A
15 v sub i plus 2 times 0 is equal to 15 v sub f plus 2 times 0
B
15 v sub i plus 2 v sub f is equal to 15 times 0 plus 2 v sub i
C
15 v sub i plus 2 times 0 is equal to open paren 15 plus 2 close paren times v sub f
D
15 times 0 plus 2 v sub i is equal to open paren 15 plus 2 close paren times v sub f
3

Two objects are interacting, but stay stationary. Which best describes what is happening to the action and reaction forces?

A
Their forces are occurring at different times.
B
There are no forces acting on the objects.
C
One object is exerting more force than the other.
D
The forces are equal and opposite each other.
4

Read the problem. A cylindrical water tank has a height of 10 meters and is filled with water open paren density is equal to 1000 the fraction with numerator kg and denominator m cubed close paren The pressure at the bottom of the tank is measured to be 98 comma 000 Pascals. The liquid in the water tank is replaced with seawater open paren density is equal to 1025 the fraction with numerator kg and denominator m cubed close paren Which describes the pressure at the bottom of the tank filled with seawater?

A
It would be greater than 98 comma 000 Pa .
B
It would be equal to 0 .
C
It would be equal to 98 comma 000 Pa .
D
It would be less than 98 comma 000 Pa .
5

Read the problem. A container with water is sealed and pressurized. Initially, the water pressure at the bottom of the container is measured at 3000 Pa. What would happen to the pressure at the bottom if the depth of the water is increased?

A
The pressure would remain the same.
B
The pressure would decrease.
C
The pressure would become zero.
D
The pressure would increase.
6

Which best describes a force?

A
a vector with speed and strength
B
a vector with direction only
C
a vector with magnitude and direction
D
a vector with strength only
7

A large truck is moving at 22.0 meters per second If its momentum is 125 comma 000 kilograms times m over s , what is the truck's mass?

A
2750 kilograms
B
11 comma 400 kilograms
C
5680 kilograms
D
176 kilograms
8

How does an airbag help protect a passenger in a car following a car accident?

A
It shortens the passenger’s stopping time, and this increases the force.
B
It increases the passenger’s stopping time, and this increases the force.
C
It shortens the passenger’s stopping time, and this decreases the force.
D
It increases the passenger’s stopping time, and this decreases the force.
9

Following an inelastic collision, what can kinetic energy be converted into? Choose three correct answers.

A
sound
B
impulse
C
momentum
D
potential energy
E
heat
10

According to Newton’s second law of motion, the acceleration of an object is inversely proportional to which quantity?

A
velocity
B
mass
C
net force
D
displacement
11

Jerome places a bag of flour on a scale. The scale shows that the bag has a weight of 17 N. Which is the reaction force of the bag sitting on the scale?

A
The bag exerts a 17 N force down on the scale.
B
The scale exerts a 17 N force up on the bag.
C
The scale exerts a 17 N force down on the counter.
D
Earth exerts a 17 N force down on the bag.
12

An object with a mass of 20 kilograms has a net force of 80 cap n acting on it. What is the acceleration of the object?

A
60 the fraction with numerator m and denominator s squared
B
100 the fraction with numerator m and denominator s squared
C
4 the fraction with numerator m and denominator s squared
D
0 point 2 5 the fraction with numerator m and denominator s squared

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Practice Test Answers — Physics in the Universe