Question

Give reason. a) Rolling a log is easier than dragging it. b) It is easy to cut vegetables using a sharp knife.

Answer 1

Answer:

i)The friction between a wood cube and the ground is usually much higher than rolling friction of a wood log, thus it takes more energy to drag a wood cube than roll a wood log.

Explanation:

ii)Pressure is inversely proportional to the area of the surface. A sharp knife has a smaller area that comes in contact with the object and hence more pressure can be applied on the object. ... Therefore it is easier to cut with a sharp knife.