Centripetal Force: Driving on Curves

1.

Multiple Choice

2 mins

1 pt

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

2.

Multiple Choice

2 mins

1 pt

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

3.

Multiple Choice

2 mins

1 pt

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

4.

Multiple Choice

2 mins

1 pt

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.

5.

Multiple Choice

2 mins

1 pt

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

6.

Multiple Choice

5 mins

1 pt

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

7.

Multiple Choice

5 mins

1 pt

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

8.

Multiple Choice

5 mins

1 pt

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.

9.

Multiple Choice

5 mins

1 pt

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

10.

Multiple Choice

5 mins

1 pt

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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