HUMAN PHYSIOLOGY
CONTROL AND COORDINATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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support force
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friction force
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gravity
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air resistance
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Detailed explanation-1: -Post force F must be stronger than must be stronger than must be stronger than the friction force. So correct.
Detailed explanation-2: -That brings us to sliding friction. Once static friction gives up, it allows the box to begin sliding across the floor, the frictional force acting on the box, is now the force of sliding friction exerted by the floor on the box.
Detailed explanation-3: -What force acts on the box to slow it down? This force is called friction. Friction is an external force that acts opposite to the direction of motion (see Figure 4.3). Think of friction as a resistance to motion that slows things down.
Detailed explanation-4: -When we push or pull an object by using our body parts, we apply our muscular force on the object. Here, the boy is pushing the box with his hand, which implies that he is applying his muscular force.
Detailed explanation-5: -Kinetic friction acts opposite the object’s sliding direction. Kinetic friction always opposes the object’s sliding direction.