Answers2003390-Physics 1 Honors Sem. 1 - PetersNewton's Second Law

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Lenny wrote the steps he used to find the mass of an object with 400 J of energy moving at a velocity of 8 m/s.1. Find the square of 8 m/s, which is 64 m2/s2. 2. Divide kinetic energy, 400 J, by 64 m2/s2, which is 6.25 J per m2/s2.3. Divide 6.25 J per m2/s2 by 2 to get a mass of 3.125 kg.

A
In Step 1, he should have found the square root of 400 J instead of squaring 8 m/s.
B
In Step 1, he should have multiplied 8 m/s by 2 instead of squaring it.
C
In Step 2, he should have divided 64 m2/s2 by 400 J instead of dividing 400 J by 64 m2/s2.
D
In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2.
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If all else is constant, which would cause the greatest increase in kinetic energy of a moving object?

A
Mass and velocity are each reduced by one-half.
B
Mass is reduced by one-half, and velocity is doubled.
C
Mass is doubled, and velocity is reduced by one-half.
D
Mass and velocity are each doubled.
3

The diagram shows a side view of a skateboard ramp.

Question illustration
A
W and X
B
X and Y
C
Y and Z
D
W and Z
4

Which object has the least amount of kinetic energy?

A
A picture of a spinning top.
Option A
B
A picture of a golf ball on a grass covered hill in sunlight.
Option B
C
A picture of a person filling a glass of water from the faucet to overflowing.
Option C
D
A picture of a roller coaster train half way down the first hill of a roller coaster track.
Option D
5

What is the kinetic energy of a 620.0 kg roller coaster moving with a velocity of 9.00 m/s? Round to 3 significant figures.

A
2,790 J
B
5,580 J
C
25,100 J
D
50,200 J
6

Four vehicles are traveling on the same road. Which vehicle most likely has the greatest kinetic energy?

A
a compact car traveling at a velocity of 10 m/s
B
a pickup truck traveling at a velocity of 25 m/s
C
a minivan traveling at a velocity of 10 m/s
D
a motorcycle traveling at a velocity of 25 m/s
7

What does it mean when work is positive?

A
Velocity is greater than kinetic energy.
B
Kinetic energy is greater than velocity.
C
The environment did work on an object.
D
An object did work on the environment.
9

Which best summarizes a concept related to the work-energy theorem?

A
When work is positive, the environment does work on an object.
B
When work is negative, the environment does work on an object.
C
When work is positive, the kinetic energy in a system remains constant.
D
When work is negative, the kinetic energy in a system remains constant.

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