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Physics Past Questions and Answers

Topic: Equilibrium of coplanar forces

Jamb Physics Questions - Equilibrium of coplanar forces

Question 1:
A block of mass m is held in equilibrium against a vertical wall by a horizontal force. If the coefficient of friction between the wall and the block is µ, the minimum value of the horizontal force is
  • A µmg
  • B (1-µ)mg
  • C (1+µ)mg
  • D Mg/µ
View Answer & Explanation
Question 2:
Two horizontal forces, 10N and 8N and another force F1 inclined at 30 to the vertical acting as shown in the diagram above, keep the body P in equilibrium, The weight of the body is
  • A 2√3/3N
  • B √2N
  • C 4√3/3
  • D 2V3N
View Answer & Explanation
Question 3:
A body of weight W N rest on a smooth plane inclined at an angle\(\theta\)o to the horizontal. What is the resolved part of the weight in Newtons along the plane?
  • A W sin\(\theta\)
  • B W cos\(\theta\)
  • C W sec\(\theta\)
  • D W tan\(\theta\)
View Answer & Explanation
Question 4:
A uniform light rod is kept in horizontal equilibrium under the influence of fore forces as shown above, which of the following equations correctly represents the condition of equilibrium for the rod
  • A F1 + F2 = F3 + F4
  • B F1 + F2 - F3 + F = 0
  • C (F1 + F2)ab = (F3 + F4)cd
  • D F1a + F2b - F3c - F4d = 0
View Answer & Explanation
Question 5:
A body of mass 2kg moving vertically upwards has its velocity increased uniformly from 10ms-1 to 40ms-1 in 4s. Neglecting air resistance, calculate the upward vertical force acting on the body.[g = 10 ms-1]
  • A 15N
  • B 20N
  • C 35N
  • D 45N
View Answer & Explanation