Ekassh
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"When the speed of a rear-drive car is increasing on a horizontal road the direction of the frictional force on the tires is: "

"A. forward for all tires B. backward for all tires C. forward for the front tires and backward for the rear tires D. backward for the front tires and forward for the rear tires E. zero"
ekassh
26/02/2013

1

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"A forward force on the axle accelerates a rolling wheel on a horizontal surface. If the wheel does not slide the frictional force of the surface on the wheel is: "

"A. zero B. in the forward direction C. in the backward direction D. in the upward direction E. in the downward direction"
ekassh
26/02/2013

1

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"Two wheels roll side-by-side without sliding, at the same speed. The radius of wheel 2 is twice the radius of wheel 1. The angular velocity of wheel 2 is: "

"A. twice the angular velocity of wheel 1 B. the same as the angular velocity of wheel 1 C. half the angular velocity of wheel 1 D. more than twice the angular velocity of wheel 1 E. less than half the angular velocity of wheel 1"
ekassh
26/02/2013
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