Question

State reason

a. We are able to walk on the ground without slipping.

b. It is easy to cut vegetables using a sharp knife. 

c. The number of tyres is more for goods vehicles. 

d. The moving parts of machines 

experience wear and tear.

Answer 1

a. Because of the friction between ground and feet

b. When the area decreases pressure increases. As the area of the edge of the knife is veiy less, it is easy to cut

c. When the area of surface increases pressure decreases, so when more wheels are used it won’t depressed in soil.

d. Because of the friction between the area of contacts.