Motion in a circle - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 2019

A mass of 0.5kg is whirled in a vertical circle of radius 2m at a steady rate of 2 rev/s. Calculate the centripetal force

A. 164N
B. 160N
C. 158N
D. 172N

Question 2:

• JAMB 1978

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

A. \(\frac{mv^2}{r}\)
B. \(\frac{mr^2}{v}\)
C. \(\frac{mr}{v}\)
D. \(\frac{mv}{r^2}\)
E. \(\frac{mv}{r}\)

Question 3:

• JAMB 1984

A particle moves in a circular orbit of radius 0.02m. If the speed of the particle is 0.88ms^-1, calculate its frequency in cycles per second

A. 2.0Hz
B. 7.0Hz
C. 8.8Hz
D. 14.0Hz
E. 17.6Hz

Question 4:

• JAMB 1988

A 20-toothed gear wheel drives a 60-toothed one. If the angular speed of the smaller wheel is 120 rev s^-1, the angular speed of the larger wheel is

A. 3 rev s^-1
B. 40 rev s^-1
C. 360 rev s^-1
D. 2400 rev s^-1

Question 5:

• JAMB 1991

An object moves with uniform speed round a circle. Its acceleration has

A. Constant magnitude and constant direction
B. Constant magnitude and varying direction
C. Varying magnitude but constant direction
D. Varying magnitude and varying direction