AnswersPOP Physics 2627Newton's Second Law

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A box that has a mass of 80 kg slides down a ramp with a 30 degree angle. The free-body diagram shows the forces acting on the box.

Question illustration
A
0.5 m/s2
B
4.9 m/s2
C
8.5 m/s2
D
9.8 m/s2
2
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A rocket experiences a constant force even as the amount of fuel in its fuel tanks decreases. What happens to the acceleration of the rocket as it runs out of fuel?

A
The acceleration decreases because the mass increases.
B
The acceleration increases because the mass increases.
C
The acceleration decreases because the mass decreases.
D
The acceleration increases because the mass decreases.
3

Which formula is used to calculate the mass of an object if the force and acceleration are known?

A
m = Fa
B
m =
Option B
C
m =
Option C
D
m = F – a
4

Devon has several toy car bodies and motors. The motors have the same mass, but they provide different amounts of force, as shown in this table.The bodies have the masses shown in this table.

Question illustration
A
motor 1, with body 1
B
motor 1, with body 2
C
motor 2, with body 1
D
motor 2, with body 2
5

Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her. Which best describes the acceleration Tracy experiences?

A
It is less than the acceleration of the backpack because she has a greater mass.
B
It is greater than the acceleration of the backpack because she has a greater mass.
C
It is less than the acceleration of the backpack because she uses a smaller force.
D
It is greater than the acceleration of the backpack because she uses a larger force.
6

What is the mass of a crate if a net force of 12 N gives the crate an acceleration of 0.20 m/s2?

A
2.4 kg
B
6 kg
C
12.2 kg
D
60 kg
7

How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2?

A
0.013 N
B
75 N
C
108 N
D
1080 N
8

Newton’s second law of motion states that the acceleration of an object is proportional to the net force acting on it.

Answer not available
9

Juanita studies several free-body diagrams in which a normal force is shown. What is always true about a normal force in a free-body diagram?

A
It is opposite the weight.
B
It is perpendicular to a surface.
C
It is opposite the net force.
D
It is parallel to a surface.
10

What is the mass of an object if a net force of 8.0 N causes it to accelerate at 1.1 m/s2?

A
6.9 kg
B
7.3 kg
C
8.8 kg
D
9.1 kg
11

An object pulled to the right by two forces has an acceleration of 2.5 m/s2. The free-body diagram shows the forces acting on the object.

Question illustration
A
50 N
B
98 N
C
313 N
D
490 N
12

For problems that involve an object accelerating along an inclined plane, how can the weight be used to determine the force component that causes motion?

A
The weight is the full force that acts perpendicular to the surface of the ramp.
B
The weight times the cosine of the ramp’s angle is the force perpendicular to the ramp.
C
The weight times the sine of the angle of the ramp acts down along the ramp.
D
The weight times the cosine of the angle of the ramp acts down along the ramp.
13

The gravitational acceleration on the moon is about one-sixth the size of the gravitational acceleration on Earth. According to Newton’s second law of motion, what happens to an astronaut who goes to the moon?

A
The astronaut’s weight decreases because the moon’s gravitational acceleration is greater than Earth’s.
B
The astronaut’s weight increases because the moon’s gravitational acceleration is greater than Earth’s.
C
The astronaut’s weight decreases because the moon’s gravitational acceleration is less than Earth’s.
D
The astronaut’s weight increases because the moon’s gravitational acceleration is less than Earth’s.

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