UCM Slides 56 - 84 | Honors

28 What force is needed to make an object move in a

circle?

• A kinetic friction

• B static friction

• C centripetal force

• D weight

29 When an object experiences uniform circular

motion, the direction of the net force is

• A in the same direction as the motion of the object

• B in the opposite direction of the motion of the object

• C is directed toward the center of the circular path

• D is directed away from the center of the circular path

30 A car with a mass of 1800 kg goes around an 18 m radius turn at a speed of 35 m/s. What is the centripetal force on the car? (Round to 4 sig figs, no units)

(a)  

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31 A ball on a string spins in a horizontal circle of radius 2.5m with a speed of 3 m/s. The tension in the string is 5.4 N. What is the mass of the ball? (Round to 2 sig figs, no units)

(a)  

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32 A 75 kg mass is attached to the end of a 5.0 m

long metal rod string which rotates in a horizontal

circular path. If the maximum force that the rod can

withstand is 8500 N. What is the maximum speed

that the mass can attain without breaking the rod? (Round to 2 sig figs, no units)

(a)  

33 What is the net force on a 2kg mass spinning in a

circle with radius 1.5 m with a frequency of 4 Hz? (Round to 2 sig figs, no units , ex. 2100 has 2 sig figs)

(a)  

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At what velocity must a car drive over

a hill if the driver (and the car for that

matter) are to appear weightless?

The driver of the car has a mass of 60

kg. The radius of the hill is 80m. (Round to 2 sig figs, no units)

(a)  

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A car is traveling at a velocity of 20 m/s.

The driver of the car has a mass of 60 kg.

The car is located at the top of a hill in the

road. The radius of the hill is 80 m. What is

the apparent weight of the driver (the normal

force supplied by the seat of the car to

support him) at the top of the hill? (Round to 2 sig figs, no units, ex. 320 has 2 sig figs)

(a)  

3The occupants of a car traveling at a speed of 25 m/s note that on a particular part of a road their apparent weight is 20% higher than their weight when driving on a flat road.

Is that part of the road a hill, or a dip?

• Hill

• Dip

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A bucket of water with a mass of 2.5kg is being spun is a vertical circle of radius 0.80m with a speed of 3.5m/s. What is the tension in the rope when the bucket is at the bottom of the circle? (Round to 2 sig figs, no units)

(a)