AT&T; LTE 3:23 PM session.masteringphysics.com 27%) Contact Forces Intro... :E M

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AT&T; LTE 3:23 PM session.masteringphysics.com 27%) Contact Forces Intro... :E MasteringPhysics Part C When a board with a box on it is slowly tilted to a larger and larger angle, common experience shows that the box will at some point "break loose" and start to accelerate down the board. The box begins to slide once the component of its weight parallel to the board, wequals the maximum force of static friction. Which of the following is the most general explanation for why the box accelerates down the board after it begins to slide (rather than sliding with constant speed)? When the box is stationary, wl equals the force of static friction, but once the box starts moving, the sliding reduces the normal force, which in turn reduces the friction. static frictionf Once the box is mo is moving, w is less than the force of static friction but greater than the force of kinetic friction. The coefficient of kinetic friction is less than the coefficient of static friction. Once the box is moving, of static friction but less than the force of kineti friction. w is greater than the force of satic friction but less han the force

Explanation / Answer

when box is stationary. static friction acts .

when box is moving then kinetic friction act.

static coefficients of friction is greater than kinetic coefficients.

when is just starts moving.

just before moving W|| = us N

just after moving W|| > uk N

so Fnet > 0 so its starts accelerating,

3rd option.

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