AnswersPhysics in the UniverseNewton's Second Law

Newton's Second Law — Quiz Answers

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1
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What is the weight of the object?

A
98 cap n
B
490 cap n
C
313 cap n
D
50 cap n
2
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What is the acceleration of the sled and the normal force acting on it, to the nearest tenth?

A
A is equal to 1 point 6 the fraction with numerator m and denominator s squared ; cap f sub cap n is equal to 65 point 6 cap n
B
A minus 2 point 2 the fraction with numerator m and denominator s squared ; cap f sub cap n is equal to 78 point 4 cap n
C
A is equal to 1 point 3 the fraction with numerator m and denominator s squared ; cap f sub cap n is equal to 63 point 1 cap n
D
A is equal to 1 point 9 the fraction with numerator m and denominator s squared ; cap f sub cap n is equal to 93 point 7 cap n
3

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 times the sine of the angle of the ramp acts down along 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 cosine of the angle of the ramp acts down along the ramp.
D
The weight is the full force that acts perpendicular to the surface of the ramp.
4

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 increases because the moon’s gravitational acceleration is greater than Earth’s.
B
The astronaut’s weight increases because the moon’s gravitational acceleration is less than Earth’s.
C
The astronaut’s weight decreases because the moon’s gravitational acceleration is greater than Earth’s.
D
The astronaut’s weight decreases because the moon’s gravitational acceleration is less than Earth’s.
5

Which quantity may be calculated directly using Newton’s second law of motion?

A
velocity
B
position
C
direction
D
weight
6

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 decreases because the mass decreases.
C
The acceleration increases because the mass decreases.
D
The acceleration increases because the mass increases.
7

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.
8

Which quantity may be calculated directly using Newton’s second law of motion?

A
direction
B
velocity
C
weight
D
position
9

Ignoring friction and air resistance, what is the acceleration of the box, to the nearest tenth?

A
9 point 8 the fraction with numerator m and denominator s squared
B
0 point 5 the fraction with numerator m and denominator s squared
C
8 point 5 the fraction with numerator m and denominator s squared
D
4 point 9 the fraction with numerator m and denominator s squared
10

What is the mass of a crate if a net force of 12 cap n gives the crate an acceleration of 0 point 2 0 the fraction with numerator m and denominator s squared ?

A
6 kilograms
B
12 point 2 kilograms
C
60 kilograms
D
2 point 4 kilograms

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