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Newton's Second Law Answers

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1
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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.

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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 cart is pulled by a force of 250 N at an angle of 35° above the horizontal. The cart accelerates at 1.4 m/s2. The free-body diagram shows the forces acting on the cart. The mass of the cart, to the nearest whole number, is kg.

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3

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.

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4

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

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A
He needs to find the net force acting on the object in a direction.
B
He needs to use only forces acting in the direction of motion.
C
He needs to combine the horizontal and vertical forces.
D
He needs to multiply the horizontal and vertical forces.
5

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.
6

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
7

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
8

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
9

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.
10

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

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