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Physics 9 Chapter 3 - Dynamics - 20
1.
What is the force that stops the bicycle?
a) Pressing force
b) Gravity force
c) Friction force
d) Restoring force
2.
Which of the following material between metal plates lowers friction the most?
a) Oil
b) Fine marble powder
c) Air
d) Water
3.
What is the coefficient of friction between glass and glass?
a) 0.5 µs
b) 0.7 µs
c) 0.9 µs
d) 0.2 µs
4.
What is the coefficient of friction between glass and metal?
a) 0.4 µs
b) 0.9 µs
c) 0.8 µs
d) 0.5 µs
5.
What is the coefficient of friction between glass and metal?
a) 0.9 µs
b) 0.7 µs
c) 0.8 µs
d) 0.4 µs
6.
What is the coefficient of friction between ice and wood?
a) 0.09 µs
b) 0.08 µs
c) 0.05 µs
d) 0.04 µs
7.
What is the coefficient of friction between iron and iron?
a) 1.2 µs
b) 1.9 µs
c) 1.4 µs
d) 1.0 µs
8.
What is the coefficient of friction between rubber and concrete?
a) 0.4 µs
b) 0.8 µs
c) 0.9 µs
d) 0.6 µs
9.
What is the coefficient of friction between steel and steel?
a) 0.8 µs
b) 0.9 µs
c) 0.7 µs
d) 0.4 µs
10.
What is the coefficient of friction between tyre and dry road?
a) 1.0 µs
b) 0.2 µs
c) 1.4 µs
d) 0.9 µs
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