Which of the following examples illustrates static friction? a box sits stationary on a ramp, a ball rolling on a lawn eventually comes to a rest, a car rounds a curve on the road, a fish swims upstream.

Option (a) is the correct answer.

Explanation:

Static friction is defined as the friction that occurs between a stationary object and the surface on which it is resting.

For example, a box resting on a ramp is stationary and a static friction occurs between the box and the ramp.

Whereas when an object moves from one place to another then there exists kinetic friction between the moving object and the surface on which it moves.

Therefore, we can conclude that out of the given examples, a box sits stationary on a ramp illustrates static friction.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion

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