What form does Newton’s second law take for angular motion?
Correct answer B. Στ = Iα
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Physics MCQs
Page 20 of Physics multiple-choice questions with answers. Tap an option to check yourself.
Page 20 of 45
A wheel of radius r turns through 30°. How far does a point on its rim move?
Correct answer A. (π/6) × r
Why does a cyclist riding round a circular racing track skid?
Correct answer B. The centripetal force upon him is greater than limiting friction
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A wheel of diameter 1 m turns at 30 revolutions per minute. What is the linear speed of a point on its rim, in m s⁻¹?
Correct answer C. π/2
What is the angular speed of the Earth’s daily rotation in rad s⁻¹?
Correct answer C. 7.3 × 10⁻⁵ rad/s
A body moving round a circle of radius R completes two revolutions. What is the ratio of its displacement to the distance covered?
Correct answer B. 0
Along which kind of path can a body move with constant velocity?
Correct answer C. Rectilinear path
A car moves at a steady 2 m s⁻¹ around a circle of radius 0.4 m. What is its angular speed?
Correct answer D. 5 rad s⁻¹
What provides the centripetal acceleration needed by the planets?
Correct answer C. Gravitational force
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On what does the length of a long jump depend?
Correct answer B. Angle of projection
A body moves in a circle of radius r with linear speed V. What is the centripetal force on it?
Correct answer A. mV²/r
How much work does a centripetal force do?
Correct answer D. No work
When a body is whirled in a horizontal circle on a string, what provides the centripetal force?
Correct answer A. The tension in the string
What angle does the whole circumference of a circle subtend at its centre?
Correct answer A. 2π radians
When a body moves in a circle, what is the angle between its linear velocity and its angular velocity?
Correct answer B. 90°
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In which direction is the linear velocity of a body moving in a circle?
Correct answer B. Along the tangent
Which expression gives the period of circular motion?
Correct answer D. T = 2πr/v
What is one radian equal to in degrees?
Correct answer D. 57.3°
According to Einstein, between what can gravitational interaction take place?
Correct answer A. Material objects and electromagnetic radiation
Approximately how far from the Earth’s centre is a geostationary orbit?
Correct answer D. 42000 km