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Flashcards: Describe the relationships between kinetic energy, mass, and speed

A monster truck is traveling at 100 meters per second and runs straight into a bike (with no one on it) The bike is traveling towards the truck at 5 meters per second. As expected, the bike goes flying because it has less kinetic energy than the monster truck. How fast would the bike have to be going to make the monster truck go flying instead?

the bike would have to be going 101 meters per second or more

the bike would have to be going 150 meters per second or more

the bike would never send the monster truck flying

there is not enough information because we don't know the mass of either object

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Flashcards: Describe the relationships between kinetic energy, mass, and speed

Your answer:

the bike would have to be going 101 meters per second or more

Your answer:

the bike would have to be going 150 meters per second or more

Your answer:

the bike would never send the monster truck flying

Correct answer:

there is not enough information because we don't know the mass of either object

Explanation:

The answer is "there is not enough information because we don't know the mass of either object."

The equation for Kinetic Energy is: KE = 1/2 mv². Kinetic energy has a direct relationship with mass, meaning that as mass increases so does the Kinetic Energy of an object. The same is true of velocity. However, mass and velocity are indirectly related. Objects with greater mass can have more kinetic energy even if they are moving more slowly, and objects moving at much greater speeds can have more kinetic energy even if they have less mass. We must consider both the speed and mass of objects when considering the outcomes of collisions.

Flashcards: Describe the relationships between kinetic energy, mass, and speed

What is the kinetic energy of a 4 kilogram book, falling at 5 meters per second?

5 Joules

100 Joules

50 Joules

10 Joules

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Flashcards: Describe the relationships between kinetic energy, mass, and speed

What is the kinetic energy of a 4 kilogram book, falling at 5 meters per second?

Your answer:

5 Joules

Your answer:

100 Joules

Your answer:

10 Joules

Correct answer:

50 Joules

Explanation:

The answer is 50 Joules. The equation for Kinetic Energy is: KE = 1/2 mv²and 1/2 of 4 x 5² = 50.

Kinetic energy has a direct relationship with mass, meaning that as mass increases so does the Kinetic Energy of an object. The same is true of velocity. However, mass and velocity are indirectly related. Objects with greater mass can have more kinetic energy even if they are moving more slowly, and objects moving at much greater speeds can have more kinetic energy even if they have less mass. We must consider both the speed and mass of objects when considering the outcomes of collisions.

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All Middle School Physical Science Resources

Flashcards: Describe the relationships between kinetic energy, mass, and speed

Flashcards: Describe the relationships between kinetic energy, mass, and speed

Flashcards: Describe the relationships between kinetic energy, mass, and speed

Flashcards: Describe the relationships between kinetic energy, mass, and speed

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