When a fat person tries to touch hit toes, keepig the legs straight he generally falls. Explain with reference to figure.

Assertion: When a person walks on a rough surface, the frictional force exerted by the surface on the person is opposite to the direction of tendenc of motion his leg. Reason: If a body moves with constant velocity, then it means that body is moving along straight line & there is no acceleration.

Which one of the following figures will generate a cone when rotated about one of its straight edges? (a) An equilateral triangle (b) A sector of a circle (c) A segment of a circle (d) A right-angled triangle