AnswersPhysicsForces, Newton's Laws, and Momentum

Practice Test Answers

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1
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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
176 kilograms
B
5680 kilograms
C
2750 kilograms
D
11 comma 400 kilograms
2
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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.
3

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

A
mass
B
displacement
C
net force
D
velocity
4

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

A
potential energy
B
momentum
C
sound
D
impulse
E
heat
5

A lab cart with a mass of 15 kilograms is moving with constant velocity, v , along a straight horizontal track. A student drops a 2 kilograms 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 times 0 plus 2 v sub i is equal to open paren 15 plus 2 close paren times v sub f
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 v sub i plus 2 v sub f is equal to 15 times 0 plus 2 v sub i
6

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 shortens the passenger’s stopping time, and this decreases the force.
C
It increases the passenger’s stopping time, and this decreases the force.
D
It increases the passenger’s stopping time, and this increases the force.
7

What is the net force acting on the child?

A
100 cap n
B
200 cap n
C
negative 100 cap n
D
0 cap n
8

What is the correct free body diagram of the broom?

A
Image with description A free body diagram with 4 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline. The second is pointing right, labeled F Subscript p Baseline. The third vector is pointing upward, labeled F Subscript N Baseline. The fourth vector is pointing left, labeled F Subscript f. The upward vector is the same length as the downward vector. The right vector is the same length as the left vector.
B
Image with description A free body diagram with 4 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline. The second vector is pointing right, labeled F Subscript f Baseline. The third vector is pointing upward, labeled F Subscript N Baseline. The fourth vector is pointing up to the left, labeled F Subscript P Baseline.
C
Image with description A free body diagram with 4 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline. The second vector is pointing left, labeled F Subscript f Baseline. The third vector is pointing upward, labeled F Subscript N Baseline. The fourth vector is pointing down to the right, labeled F Subscript P Baseline. All vectors are the same length.
D
Image with description A free body diagram with 3 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline. The second vector is pointing right, labeled F Subscript p Baseline. The third vector is pointing upward, labeled F Subscript N Baseline. All three vectors are of equal length.
9

In the table, which force has the wrong direction?

A
Gravity
B
Tension by Clara
C
Kinetic friction
D
Tension by Eduardo
10

What is the frictional force, cap f sub f , acting on the object?

A
negative 244 point 5 cap n
B
negative 494 point 5 cap n
C
negative 5 point 5 cap n
D
negative 15 cap n

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