What Is Energy Physics

A skateboarder with a mass of 75.0 kg at the top of a 4.50 m ramp will have how much kinetic energy at the moment before they reach the bottom of the ramp? (g=9.81m/s²)

• 3.31x10³ KJ

• 3.31 J

• 3310.875 J

• 3.31 KJ

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How fast is the 75.0 kg skateboarder from Question 1 travelling when they reach the bottom of the 4.50 m ramp?

• 88.3 m/s

• 9.40 m/s

• 3.31 m/s

• 33.1 m/s

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What are the two types of Mechanical Energy?

• Elastic and Kinetic

• Thermal and Potential

• Potential and Chemical

• Kinetic and Potential

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Kinetic Energy is defined as:

• Energy stored due to its location

• Energy stored in the bond of molecules

• Heat Energy

• Energy of motion

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A 70.0 kg runner is travelling at 5.05 m/s. What is their kinetic energy?

• 892 J

• 177J

• 892 KJ

• 3.47x10³ J

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Which of the following has the most kinetic energy?

• A 20 kg toddler running at 5 m/s

• A 50 kg toddler running at 30 m/s

• A 90 kg toddler running at 30 m/s

• A 100 kg toddler running at 2 m/s

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Gravitational Potential Energy is defined as:

• the energy an object has due to its motion

• the energy a spring has due to its stretch

• the energy an object has due to its height from the ground

• the chemical energy stored in the molecules of atoms

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The equation for PE (gravitational potential energy) is:

• mgh²

• mgh

• 1/2mgh

• 1/2mv²

The equation for KE (kinetic energy) is:

• mgh²

• 1/2mgh

• mgh

• 1/2mv²

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NGSS.HS-PS3-2

You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what type of energy does it have?

• Kinetic Energy

• Potential Energy

• Thermal Energy

• Chemical Energy

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