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Physics 9 Chapter 3 - Dynamics - 21
1.
What is the coefficient of friction between tyre and wet road?
a) 0.7 µs
b) 0.9 µs
c) 0.2 µs
d) 1.0 µs
2.
What is the coefficient of friction between wood and wood?
a) 0.9 µs
b) 1.4 µs
c) 0.7 µs
d) 0.25 µs
3.
What is the coefficient of friction between wood and metal?
a) 1.4 µs
b) 0.9 µs
c) 0.2 µs
d) 0.7 µs
4.
How much is the force of friction between a wooden block of mass 5 kg and the horizontal marble floor. The coefficient of friction between wood and the marble is 0.6?
a) 300 N
b) -30 N
c) 30 N
d) 0.30 N
5.
What does the force of friction between the wheel and the ground at the point of contact provide when the axle of a wheel is pushed?
a) Constant reaction
b) None of these
c) Force of limiting friction
d) Reaction force
6.
Why the rolling friction is extremely small than sliding friction?
a) Because the wheel slides without rupturing the cold-welds
b) Because the wheel rolls without rupturing the hot-welds
c) Because the wheel rolls without rupturing the cold-welds
d) Because the wheel slides without rupturing the hot-welds
7.
What is desirable for wheels to roll over a surface?
a) Restoring force
b) Gravity force
c) Pressing force
d) Friction force
8.
It is dangerous to drive on a wet road. Why?
a) Because friction between the road and the tyres is very large
b) Because restoring force between road and tyres is very small
c) Because friction between the road and the tyres is very small
d) Because restoring force between road and tyres is very large
9.
Why the threading on tyres is designed?
a) To decrease reaction force
b) To increase reaction force
c) To decrease friction
d) To increase friction
10.
What is the coefficient of friction between wood and concrete?
a) 0.52 µs
b) 0.62 µs
c) 1.32 µs
d) 0.42 µs
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