Physics 9 Chapter 3 - Dynamics - 25

Physics 9 Chapter 3 - Dynamics - 25

1. What is the formula for centripetal force Fc?

a) Formula: Fc = mv² + r
b) Formula: Fc = mv² + r
c) Formula: Fc = mv / r
d) Formula: Fc = mv² / r

2. Upon which of the following component, centripetal force needed by a body moving in a circle depends?

a) All of these
b) Square of velocity v of body
c) Mass m of the body
d) Reciprocal to the radius r of the circle

3. According to Newton’s which law of motion, there exists a reaction to the centripetal force?

a) Newton’s third law of motion
b) Newton’s fourth law of motion
c) Newton’s first law of motion
d) Newton’s second law of motion

4. What is the centripetal reaction called that pulls the string outward?

a) Contrive force
b) Friction force
c) Centripetal force
d) Centrifugal force

5. A stone of mass 100 g is attached to a string 1m long. The stone is rotating in a circle with a speed of 5 ms^-1. Find the tension in the string?

a) 2.5 N
b) 100 N
c) 20 N
d) 0.5 N

6. How much centripetal force is needed to make a body of mass 0.5 kg to move in a circle of radius 50cm with a speed 3 ms^-1?

a) 9 N
b) 25 N
c) 0.15 N
d) 150 N

7. How tension T is related to centripetal force Fc?

a) T = Fc
b) T = 1 + Fc
c) T = 1 / Fc
d) T = 1 / (Fc) ²

8. While the coaster cars move around the loop, what force the track provides preventing them to move away from the circle?

a) Friction force
b) Contrive force
c) Centrifugal force
d) Centripetal force

9. When a car takes a turn, what force is needed to keep it in its curved track?

a) Contrive force
b) Friction force
c) Centrifugal force
d) Centripetal force

10. What is a separator?

a) Low-speed spinner
b) High-speed spinner
c) High-speed washer
d) Low-speed spinner

11. What does the friction between the tyres and the road provides?

a) Contrive force
b) Friction force
c) Centrifugal force
d) Centripetal force

12. What is meant by the banking of a road?

a) To raise the inner edge of a road
b) To raise the road from the centre
c) None of these
d) To raise the outer edge of a road

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