ROTATIONAL MOTION MCQ Quiz: GKFix - Bridge of Knowledge - Page 395

Question 1971

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Why is the vector ω × CP directed along the tangent at point P?

Because it opposes motion
Because it is radial
Because it is parallel to ω
Because it is perpendicular to both ω and CP

Question 1972

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What happens to the cross product ω × OC when ω and OC are parallel?

It equals ω × r
It becomes infinite
It becomes ω · OC
It becomes zero

Question 1973

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What is the primary reason for using r⊥ instead of r in rotational velocity calculations?

r is always zero
r⊥ is easier to measure
It represents the effective radius perpendicular to the axis of rotation
r⊥ includes mass factor

Question 1974

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Which of the following best defines rotational motion?

Motion in a straight line
Vibration about a mean position
Free fall under gravity
Motion of a body about a fixed axis

Question 1975

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What is the condition for zero torque due to a force?

Force is perpendicular to r
Force is large
Force is small
Force is parallel or antiparallel to position vector