AnswersPOP Physics 2627Newton's Second Law

Newton's Second Law Answers

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A sled that has a mass of 8 kg is pulled at a 50 degree angle with a force of 20 N. The force of friction acting on the sled is 2.4 N. The free-body diagram shows the forces acting on the sled.

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a
a = 1.3 m/s2; FN = 63.1 N
a
a = 1.6 m/s2; FN = 65.6 N
a
a = 1.9 m/s2; FN = 93.7 N
a
a = 2.2 m/s2; FN = 78.4 N
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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?

T
The acceleration decreases because the mass increases.
T
The acceleration increases because the mass increases.
T
The acceleration decreases because the mass decreases.
T
The acceleration increases because the mass decreases.
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best

I
It is less than the acceleration of the backpack because she has a greater mass.
I
It is greater than the acceleration of the backpack because she has a greater mass.
I
It is less than the acceleration of the backpack because she uses a smaller force.
I
It is greater than the acceleration of the backpack because she uses a larger force.
4

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
0
0.5 m/s2
4
4.9 m/s2
8
8.5 m/s2
9
9.8 m/s2
5

Chang sees the following formula on a website about Newton’s second law. a =

Question illustration
H
He needs to find the net force acting on the object in a direction.
H
He needs to use only forces acting in the direction of motion.
H
He needs to combine the horizontal and vertical forces.
H
He needs to multiply the horizontal and vertical forces.
6

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?

T
The weight is the full force that acts perpendicular to the surface of the ramp.
T
The weight times the cosine of the ramp’s angle is the force perpendicular to the ramp.
T
The weight times the sine of the angle of the ramp acts down along the ramp.
T
The weight times the cosine of the angle of the ramp acts down along the ramp.
7

The weight of a bucket is 186 N. The bucket is being raised by two ropes. The free-body diagram shows the forces acting on the bucket. The acceleration of the bucket, to the nearest tenth, is m/s2.

Answer:

1.8

8

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?

T
The astronaut’s weight decreases because the moon’s gravitational acceleration is greater than Earth’s.
T
The astronaut’s weight increases because the moon’s gravitational acceleration is greater than Earth’s.
T
The astronaut’s weight decreases because the moon’s gravitational acceleration is less than Earth’s.
T
The astronaut’s weight increases because the moon’s gravitational acceleration is less than Earth’s.
9

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

Question illustration
m
m = Fa
m
m =
Option m
m
m =
Option m
m
m = F – a
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?

6
6.9 kg
7
7.3 kg
8
8.8 kg
9
9.1 kg

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