A Block Is First Placed on Its Long Side and Then

question 43

Multiple Choice

A block is first placed on its long side and then on its short side on the same inclined plane.The block slides down the plane on its short side but remains at rest on its long side.A possible explanation is:

• A)the short side is smoother
• B)the frictional force is less because the contact area is less
• C)the center of gravity is higher in the second case
• D)the normal force is less in the second case
• E)the force of gravity is more nearly down the plane in the second case

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Definitions:

Marine Polychaetes

A diverse class of annelid worms, commonly known as bristle worms, that live in various marine environments.

Chitin-Reinforced Bristles

Stiff bristles made stronger with the natural polymer chitin, commonly found in the exoskeletons of arthropods.

Chitin-Hardened Tentacles

Tentacles strengthened by chitin, a polysaccharide found in the exoskeletons of arthropods and cell walls of fungi.

Capture Prey

The act or process by which an organism secures another organism for food.