When a car moves on a circular track, centripetal force is provided by friction, how a force acting in opposite direction of motion of body can provide a force acting towards centre of the circle?

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Nestor RutherfordLv2

12 Oct 2019

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The difference between positive and negativeworkstems from the direction of motion of the body the force actsonand:

a. the magnitude of the force acting onthebody
b. the point of application of the force acting on thebody

c. the line of action of the force acting onthebody

d. the direction of the force acting onthebody

e. there is no difference between positiveandnegative

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The net force acting on an object in uniform circular motionis

1)zero,

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3)centrifugal, i.e. points away from the center of thecircle,

4)centripetal, i.e. points towards the center of the circle.

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Which of the following statements are true about the motion of an object?

a) An object can move even when no force acts on it.

b) If an object isn't moving, no external forces act on it.

c) If a single force acts on an object, the object accelerates.

d) If an object accelerates, atleast one force is acting on it.

e) If an object isn't accelerating,no external force is acting on it.

f) If the net force acting on an object is in the positive x-direction, the object moves only in the positive x-direction.