Kinetic Energy and Motion Concepts

Mr. Millings explains how to calculate kinetic energy using the formula KE = 1/2 mv^2. The video covers three examples: calculating kinetic energy of a racecar, determining the mass of a bowling ball, and finding the velocity of a locomotive. Each example demonstrates the application of the kinetic energy formula, emphasizing the importance of units and significant figures.

What is the unit of measurement for kinetic energy?

• Newton

• Pascal

• Watt

• Joule

Which of the following is the correct formula for kinetic energy?

• KE = mass x velocity^2

• KE = mass x velocity

• KE = 1/2 x mass x velocity^2

• KE = 1/2 x velocity^2

In the first example, what is the velocity of the racecar?

• 55 m/s

• 45 m/s

• 75 m/s

• 65 m/s

How much kinetic energy does the racecar have in the first example?

• 1,334,375 J

• 1,234,375 J

• 1,134,375 J

• 1,434,375 J

In the second example, what is the velocity of the bowling ball?

• 3.5 m/s

• 3.0 m/s

• 2.5 m/s

• 2.0 m/s

What is the mass of the bowling ball calculated in the second example?

• 6.0 kg

• 5.0 kg

• 8.0 kg

• 7.0 kg

In the third example, what is the mass of the locomotive?

• 210,000 kg

• 200,000 kg

• 190,000 kg

• 180,000 kg

What is the kinetic energy of the locomotive in the third example?

• 3.5 million J

• 3.0 million J

• 2.5 million J

• 2.0 million J

What is the calculated velocity of the locomotive in the third example?

• 5.1 m/s

• 6.1 m/s

• 7.1 m/s

• 4.1 m/s

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