Which of the following shapes of flying machine offers the least frictional force?
Irregular
Tree-Like
Symmetrical With Many Arms
Streamlined
What does the lubrication of the moving surfaces do?
Removes friction
Reduces friction
Increases friction
Has no effect on friction
Which of the following has the least magnitude?
Rolling friction
Static friction
Sliding friction
All of them have equal magnitudes
Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.
Rolling, static, sliding
Rolling, sliding, static
Static, sliding, rolling
Sliding, static, rolling
Alida runs her toy car on (1) dry marble floor, (2) wet marble floor, (3) newspaper and (4) towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be:
(2), (1), (3), (4)
(3), (4) (1), (2)
(4) (3), (1), (2)
(2), (1), (4) (3)
Click each box on the left and then click the matching box on the right.
