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Get the formative assessment: FA7.1.docx
The formative assessment solved:
1. With what maximum velocity can a car go around a 312 m radius curve if it cannot exceed 3.136 m/s/s of lateral acceleration?
(31.3 m/s )
2. A Centrifuge has a radius of 5.75 cm, and spins at with a period of 0.0171s. What is the centripetal acceleration?
(7,763 m/s/s)
3. What centripetal force would make a 120. kg bike and rider go 17.0 m/s around a 178 m radius corner?
(195 N)
4. A spinning carnival ride has a radius of 4.20 m. What is the period of the ride if it is exerting a centripetal force of 895 N on a 64.0 kg person?
(3.44 s)
5. What is the minimum coefficient of friction needed for a 1205 kg car to go 27.0 m/s around a level corner with a radius of 280. m? What about a 3450 kg SUV?
(0.266, 0.266)
Help with the Quizlette:
7.1 Quizlette - Centripetal Force and Acceleration
Velocity - radius equation
1. What is the centripetal acceleration of a skier going 23.0 m/s around a corner with a radius of 56.0 m? (9.45 m/s/s) <Video>
2. A car going around a corner with a radius of 340. m is accelerating laterally at 6.40 m/s/s. What is its speed? (46.6 m/s) <Video>
3. A car goes 23.0 m/s around a corner with a lateral acceleration of 4.50 m/s/s. What is the radius of the corner? (118 m) <Video>
Period - radius equation
4. A centrifuge has a radius of 0.0870 m, and a period of 0.0230 s. What is its centripetal acceleration? (6493 m/s/s) <Video>
5. A centrifuge generates a centripetal acceleration of 3760 m/s/s with a period of 0.0310 s. What is the radius of the centrifuge? (0.0915 m) <Video>
6. A centrifuge generates an acceleration of 9250 m/s/s with a radius of 0.0680 m. What is its period of motion? (0.0170 s) <Video>
Centripetal force
7. What centripetal force do you need to make a 78.0 kg skier go 39.0 m/s around a 98.0 m radius corner? (1211 N) <Video>
8. What is the maximum velocity you can twirl a 3.90 kg hammer in a 1.80 m radius circle if the string it is attached to has a tensile strength of 190. N? (9.36 m/s) <Video>
9. A centrifuge makes 0.0140 kg test tubes go in a 0.0860 m radius circle with a period of 0.0455 s. What force does it exert on the test tubes? (23.0 N) <Video>
10. A centrifuge exerts 213 N on a 0.0120 kg test tube spinning in a 0.0750 m radius circle. What is its period of motion? (0.0129 s) <Video>
Friction provides centripetal force:
11. A 1450 kg car with a coefficient of friction of 0.870 goes around a level corner at 27.0 m/s. What is the minimum radius the corner can have? (85.5 m) <Video>
12. There is a coefficient of friction of 0.930 between a 1230 kg car and the level road. What is its maximum possible velocity around a 330. m radius corner? (54.8 m/s) <Video>
13. A 0.120 kg mass is on a level turntable. If there is a coefficient of friction of 0.340 between the turntable and the mass, and the turntable has a period of 1.33 s, what is the maximum distance the mass can be from the center and not fly off? (0.149 m) <Video>
14. A 0.0110 kg eraser is on a level turntable 0.180 m from the center. If there is a coefficient of friction of 0.880 between the turntable and the eraser, what is the minimum period of motion the turntable can have for the eraser to remain without flying off? (0.908 s) <Video>
More practice problems:
7.1 - Circular Motion
Get the handout: Worksheet-P7.1-Centripetal.docx
Practice 7.1 - Do these on your own paper.
1. a. What velocity must a car go around a 250. m radius corner to have a centripetal acceleration of 3.30 m/s/s? (28.7 m/s) <Video>
b. A centrifuge generates a centripetal acceleration of 3450 m/s/s with a period of 0.0258 s. What is the radius of the centrifuge? (0.0582 m) <Video>
c. What centripetal force do you need to make a 85.0 kg skier go 25.0 m/s around a 15.0 m radius corner? (3542 N) <Video>
d. A centrifuge exerts a force of 182 N on a 0.130 kg test tube spinning with a period of .0312 s. What is the radius of the centrifuge? (0.0345 m) <Video>
e. A 1120 kg car with a coefficient of friction of 0.730 goes around a level corner at 25.0 m/s. What is the minimum radius the corner can have? (87.4 m) <Video>
2. a. What is the centripetal acceleration of a skater going 6.40 m/s around a corner with a radius of 2.00 m? (20.48 m/s/s) <Video>
b. A centrifuge generates an acceleration of 9520 m/s/s with a radius of 0.0780 m. What is its period of motion? (0.0180 s) <Video>
c. A centrifuge has a radius of 0.0350 m, and a period of 0.0256 s. What force does it exert on a 0.0670 kg test tube? (141 N) <Video>
d. A 81.0 kg ice skater goes around a corner at 16.0 m/s. If the ice skates can generate a maximum lateral force of 480. N, what is the minimum radius of corner they can go around? (43.2 m) <Video>
e. A 0.0180 kg eraser is on a level turntable 0.170 m from the center. If there is a coefficient of friction of 0.850 between the turntable and the eraser, what is the minimum period of motion the turntable can have for the eraser to remain without flying off? (0.898 s) <Video>
3. a. A car goes 23.0 m/s around a corner with a lateral acceleration of 4.50 m/s/s. What is the radius of the corner? (118 m) <Video>
b. A centrifuge has a radius of 0.0920 m, and a period of 0.0450 s. What is its centripetal acceleration? (1794 m/s/s) <Video>
c. What force do you need to twirl a 4.30 kg hammer in a 1.28 m radius circle at 7.20 m/s? (174 N) <Video>
d. A centrifuge exerts 298 N on a 0.0370 kg test tube spinning in a 0.0650 m radius circle. What is its period of motion?
(0.0178 s) <Video>
e. There is a coefficient of friction of 0.870 between a 1670 kg car and the level road. What is its maximum possible velocity around a 130. m radius corner? (33.3 m/s) <Video>
4. a. A car going around a corner with a radius of 180. m is accelerating laterally at 3.40 m/s/s. What is its speed? (24.7 m/s)
b. A centrifuge generates an acceleration of 6590 m/s/s spinning test tubes in a circle with a period of 0.0370 s. What is the radius of the centrifuge? (0.229 m)
c. A centrifuge makes 0.0790 kg test tubes go in a 0.0750 m radius circle with a period of 0.0545 s. What force does it exert on the test tubes? (78.8 N)
d. What is the maximum velocity you can twirl a 3.76 kg hammer in a 1.40 m radius circle if the string it is attached to has a tensile strength of 158 N? (i.e. that is the centripetal force) (7.67 m/s)
e. A 0.100 kg mass is on a level turntable 0.120 m from the center. If there is a coefficient of friction of 0.210 between the turntable and the mass, what is the minimum period of motion the turntable can have for the mass to remain without flying off? (1.52 s)
5. a. What is the centripetal acceleration of a skier going 13.0 m/s around a corner with a radius of 26.0 m? (6.5 m/s/s)
b. A centrifuge generates an acceleration of 2560 m/s/s with a radius of 0.0870 m. What is its period of motion? (0.0366 s)
c. What force do you need to twirl a 7.40 kg hammer in a 1.50 m radius circle at 12.0 m/s?? (710.4 N)
d. A 0.0650 m radius centrifuge exerts a force of 190. N on a test tube. What is the mass of the test tube if its period of motion is 0.0380 s? (0.107 kg)
e. There is a coefficient of friction of 0.740 between a 1780 kg car and the level road. What is its maximum possible velocity around a 180. m radius corner? (36.1 m/s)
The instruction for this unit:
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