PHY 121 Ch 5c Lecture

# PHY 121 Ch 5c Lecture - Lecture 9 Tuesday February 12 1 If...

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1 Lecture 9 Tuesday, February 12

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2 If a curve is banked it is easier for a car to turn it because A. The weight acquires a component in the direction of the centripetal acceleration. B. The normal force cancels the effect of gravity . C. The normal force becomes less than the weight. D. None of the above.
3 The centrifugal force A. cancels the effect of the centripetal force. B. causes circular motion when it is less than the centripetal force. C. does not exist. D. is not discussed in the reading assignment.

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4 An object is in uniform circular motion at speed v . If the speed is doubled, the net force needed to keep it going along the same circular path... A. Remains the same. B. Must be halved. C. Must be doubled. D. Must be quadrupled.
5 The protons in the nucleus of an atom are held together by A. their gravitational interaction. B. their electromagnetic interactions. C. the weak interaction that is also responsible for supernova explosions. D. the strong interaction.

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6 Uniform circular motion If an object moves at constant speed, we know that the acceleration must be perpendicular to the velocity. But not any constant speed motion is circular. For circular motion at constant speed the magnitude of the perpendicular acceleration must be: !
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