Centripetal Force: Driving on Curves

A car is rounding a bend as shown in the diagram. Which arrow correctly shows the direction of the cars velocity?

• A

• B

• C

• D

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A car is rounding a curve as shown in the diagram. Which arrow correctly shows the direction of the centripetal force keeping the car in circular motion?

• A

• B

• C

• D

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In the diagram of the car, if the driver took his hands off the steering wheel, which arrow correctly shows the direction the car would travel in?

• A

• B

• C

• D

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Why do sharp turns in roads have reduced speed limits posted?

• The lower the speed the lower centripetal force.

• The lower the speed the higher centripetal force.

• The lower the speed the larger the radius.

• Speed limits aren't reduced on sharp turns.

If car A and car B are both traveling at the same speed, which will require a higher centripetal force?

• Car A

• Car B

• They have the same centripetal force

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If a sprinter runs in a circle of radius 50 m in 31 seconds at a constant speed, how fast were they running?

• 1.61 m/s

• 3.22 m/s

• 5.07 m/s

• 10.1 m/s

A bola is an old hunting instrument. If three rocks with a combined mass of 0.75 kg are spun at a speed of 20 m/s with a radius of 0.5 m, how much centripetal force is required to keep them spinning.

• 600 N

• 45 N

• 30 N

• 400 N

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NGSS.HS-PS2-1

A car's tires can provide a frictional force up to 8500 N. If a 1000 kg car is traveling at 30 m/s around a bend with a radius of 25 m, will it safely make it around the curve.

• No, the required centripetal force is too high.

• Yes, the required centripetal force is higher than the frictional force.

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An engineer is planning a road with a turn. If the speed limit is 20 m/s and the centripetal acceleration cannot exceed 8.5 m/s/s, how big must the radius of the turn be?

• 2.4 m

• 47 m

• 170 m

• 3400 m

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NGSS.HS-PS2-1

Why should you reduce speed around a turn if the road is icy?

• Because your car will travel in a straight line unless forced to do otherwise

• Because the ice reduces the frictional force between the tires and the road.

• Because a minimum amount of centripetal force is required to keep your car moving around the curve.

• All of the above.

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