Mid-Unit 5 Energy Review

A small car with a mass M initially moves with velocity V flat road. The small car travels a distance D as it skids to a stop in an emergency. Assume the friction force between the tires and the road are constant during the stop.

A. What would need to be measured to calculate the Force of Friction between the tires and the road? Select all that apply.

• Coefficient of Friction

• Mass of the car

• Initial Velocity of the car

• Stopping Distance

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NGSS.HS-PS2-1

A small car with a mass M initially moves with velocity V flat road. The small car travels a distance D as it skids to a stop in an emergency. Assume the friction force between the tires and the road are constant during the stop.

If the same car now experiences a velocity of 3V, how does the stopping distance D compare?

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NGSS.HS-PS2-1

A small car with a mass M initially moves with velocity V flat road. The small car travels a distance D as it skids to a stop in an emergency. Assume the friction force between the tires and the road are constant during the stop.

C. If a large truck with a mass of 2M and speed of V, how does the stopping distance D compare if the truck experiences the same friction force as the car?

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NGSS.HS-PS2-1

A person applies a horizontal force to push a cart starting from rest. The applied force is shown in the Force-distance graph above. The sled experiences 2 N of Friction force.

A. Describe the motion of the cart from 6 to 8 meters. Justify your answer in one sentence.

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NGSS.HS-PS2-1

A person applies a horizontal force to push a cart starting from rest. The applied force is shown in the Force-distance graph above. The sled experiences 2 N of Friction force.

B. How much Work does the person do on the cart during the first 6 m trip of the trip?

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NGSS.HS-PS2-1

A person applies a horizontal force to push a cart starting from rest. The applied force is shown in the Force-distance graph above. The sled experiences 2 N of Friction force.

C. At what displacement is the object moving the fastest? (Hint: When has the most work been done overall?)

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NGSS.HS-PS2-1

A person applies a horizontal force to push a cart starting from rest. The applied force is shown in the Force-distance graph above. The sled experiences 2 N of Friction force.

D. What would you need to measure (that is not already given in the graph) to determine the increase in the cart's velocity (∆v) during the 10 m ride? Justify your answer in one sentence.

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NGSS.HS-PS2-1