Conservation of Energy - Quiz Quiz

Question 1

Disregarding air resistance, what is the speed of a ball dropped from 12 feet just before it hits the ground? (Use 1 foot is equal to 0 point 3 0 m , and use g is equal to 9 point 8 the fraction with numerator m and denominator s squared )

Revolt · Accepted Answer

D: 8.4 meters per second

Question 2

A 440 kilograms roller coaster car is going 26 meters per second when it reaches the lowest point on the track. If the car started from rest at the top of a hill, how much higher was that point on the track than the lowest point? (Use g is equal to 9 point 8 0 the fraction with numerator m and denominator s squared , and ignore friction.)

Revolt · Accepted Answer

D: 34 m

Question 3

Irving, a cat, has a favorite toy that is made up of a squeaky ball at the end of a string. The toy makes up a closed system. Irving’s owner dangles the toy so that the ball swings down and then swings back up again. Ignoring any friction, how are kinetic and potential energy related to each other as the ball swings back and forth?

Revolt · Accepted Answer

A: As the ball moves upward, kinetic energy decreases and potential energy increases.

Question 4

A 7 point 0 0 kilograms bowling ball is held 2 point 0 0 m above the ground. Using g is equal to 9 point 8 0 the fraction with numerator m and denominator s squared , how much energy does the bowling ball have due to its position?

Revolt · Accepted Answer

C: 137 cap j

Question 5

What best describes the energy in a closed system at the beginning of a day and the energy at the end of the same day? Choose three correct answers.

Revolt · Accepted Answer

A: The total initial energy will be equal to the total final energy.; C: Some energy can be changed from one form to another.; G: Friction can cause the amount of thermal energy to increase.

Question 6

Which equation represents the law of conservation of energy in a closed system?

Revolt · Accepted Answer

D: cap k cap e sub i plus cap p cap e sub i is equal to cap k cap e sub f plus cap p cap e sub f

Question 7

What does the law of conservation of energy state about energy in a closed system?

Revolt · Accepted Answer

C: Energy cannot be created or destroyed.

Question 8

A box is sliding along a frictionless surface and gets to a ramp. Disregarding friction, how fast should the box be going on the ground in order to slide up the ramp to a height of 2 point 5 meters, where it stops? (Use g is equal to 9 point 8 the fraction with numerator m and denominator s squared )

Revolt · Accepted Answer

B: 7.0 meters per second

Question 9

When an object is not in motion, it can still have a form of energy. What form of energy does an object have due to its distance from Earth?

Revolt · Accepted Answer

C: gravitational potential energy

Question 10

What is the potential energy of a spring that is compressed 0 point 6 5 m by a 25 kilograms block if the spring constant is 95 cap n over m ?

Revolt · Accepted Answer

A: 20 cap j

Conservation of Energy - Quiz Quiz Answers

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