Formative Assessment.

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Presentation transcript:

Formative Assessment

1. With what maximum velocity can a car go around a 312 m radius curve if it cannot exceed 0.320 “g”s of lateral acceleration? (31.3 m/s )

2. A Centrifuge has a radius of 5. 75 cm, and spins at 3500. RPM 2. A Centrifuge has a radius of 5.75 cm, and spins at 3500. RPM. What is the centripetal acceleration? (7,720 m/s/s)

3. What centripetal force would make a 120. kg bike and rider go 17 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 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)

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33 N 10. What centripetal force is needed to make a 5 Kg hammer swing 3.4 m/s in a arc with radius 1.75 m?

3250 N 11. What centripetal force is needed to make a 65 Kg rider go 15 m/s on the edge of a ride with a radius of 4.5 m?

7.2x105 m 12. A 320 Kg space probe has jets which can exert a centripetal force of 120 N. What is the sharpest radius of a turn it can make if it is going 520 m/s?

10.3 m/s 13. How fast can your 800 Kg car go around a corner with a radius of 13 m when the available centripetal force is 6500 N?

3998.4 N 15.6 m/s 14. There is a coefficient of friction of 0.34 between a 1200 kg car and the pavement. What is the force of friction between the road and the tires, and what is the car's maximum speed around a 73 m radius corner?

5.13 m/s/s 0.52 15. A 2.0 gram penny is on a turntable 13 cm from the center. As you gradually speed up the turntable, the penny flies off when it is turning one revolution per second. What is the centripetal acceleration of the penny, and what is the coefficient of friction between the penny and the turntable? (Hint – set the force of friction equal to the centripetal force)

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