Topic 3 Lesson 2

Topic 3 Lesson 2

By Ms. Rema

A landslide is a sudden movement of rock and soil. Before the landslide, all the rocks and soil were in place and not moving.

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What direction do you think the rocks and dirt are moving?​

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Landslide!

p 101​

Multiple Choice

It takes energy to cause the motion that was seen in the landslide.

• True

• False

Multiple Choice

When objects are in motion, they are demonstrating what kind of energy?

• potential

• kinetic

• virtue

• rocks

Multiple Choice

Kinetic energy depends on both ____ and ____.

• mass and energy

• speed and size

• speed and mass

• speed and energy

Multiple Choice

The faster an object moves, the more kinetic energy it has.

• True

• False

Multiple Choice

A wheelbarrow full of dirt has more kinetic energy than a wheelbarrow that is empty.

• True

• False

Kinetic and Potential Energy

p102​

Calculations

Multiple Choice

Kinetic Energy =

• ¹/₃ x Mass x Speed²

• ¹/₂ x Mass x Energy²

• ¹/₃ x Volume x Speed²

• ¹/₂ x Mass x Speed²

Multiple Choice

Speed is multiplied by itself first because of the ¹/₂.

• True

• False

Multiple Choice

In the example shown, the first step is...

• multiply 2 times ¹/₂

• multiply 50 times 4

• multiply 2 times 2

• multiply ¹/₂ times 50

Multiple Choice

What is the kinetic energy of the white dog?

• 40 J

• 90 J

• 45 J

• 180 J

Multiple Choice

What is the kinetic energy of the black dog?

• 40 J

• 90 J

• 45 J

• 180 J

Multiple Choice

What is the kinetic energy of the boy?

• 190 J

• 90 J

• 75 J

• 180 J

Multiple Choice

Suppose the white dog speeds up to 6 m/s. What is its new kinetic energy?

• 190 J

• 90 J

• 75 J

• 180 J

Multiple Choice

The amount of matter present in an object:

• Weight

• Speed

• Distance

• Mass

Multiple Choice

A 20 kg dog run to you at 8 m/s. What is its mass?

• 8 m/s

• 20 kg

• 2.5 m/s

• 640 J

Multiple Choice

What is the unit for mass?

• Joules (J)

• Kilograms (kg)

• Meters (m)

• Meters per Second (m/s)

Multiple Choice

A 50,000 kg plane flies 250 m/s. What is the plane's speed?

• 50,000 kg

• 200 m/s

• 250 m/s

• 50,000 m/s

Multiple Choice

What is the unit for speed?

• Joules (J)

• Kilograms (kg)

• Meters (m)

• Meters per Second (m/s)