The unit of coefficient of friction is . . . .
a) N
b) kg
c) µ
d) it has no unit
The centripetal acceleration for an object of mass 1 kg moving with 6 m/s in a circle of radius 3 m is . . . . .
a) 18 m/s2
b) 12 m/s2
c) 10 m/s2
d) 2 m/s2
How many times the centripetal force will increase if mass of a body moving with uniform speed in a circle is doubled?
a) six
b) two
c) four
d) eight
Which of the following forces can act as a centripetal force?
a) tension
b) friction
c) gravitational force
d) all of these
An empty suitcase is placed in the middle of bus on its floor travelling at high speed. When the bus brake suddenly, the suitcase slide . . . . .
a) backward
b) forward
c) jumps up
d) remain in place
In Newton’s third law the action reaction pair does not neutralize each other, because they…
a) act on the same body
b) act on different bodies
c) act on third body
d) produce friction
