Equilibrium of Forces - Jamb Physics Past Questions and Answers

Question 21:

• JAMB 1993

In the fig above,A lever of length 200m is used to lift a load of mass 180kg. The pivot at P is 20m from the load. what minimum force F must be applied at the end of the lever [g = 10ms^-2]

A. 9N
B. 18N
C. 20N
D. 200N

Question 22:

• JAMB 1994

A cone in an unstable equilibrium has its potential energy

A. Decreased
B. Increased
C. Unchanged
D. Oscillating

Question 23:

• JAMB 1994

The fig above shows a uniform wood of weight 200Nand length 50m. It is pivoted at one end and suspended by a cord at the other end at an angle of 30 degrees to the wood. calculate the tension in the cord if the wood is horizontal

A. 10N
B. 20N
C. 100N
D. 200N

Question 24:

• JAMB 1995

A uniform rod PQ of length 1m and mass 2kg is pivoted at the end p. If load of 14N is placed at the center of the rod, find the force that should be applied vertically upwards at Q to maintain the rod at equilibrium horizontally [g = 10ms^-2]

A. 68N
B. 28N
C. 17N
D. 7N

Question 25:

• JAMB 1997

For what value of 6 are the forces in the diagram above in equilib4ruim

A. \( 15^{\circ} \)
B. \( 30^{\circ} \)
C. \( 45^{\circ} \)
D. \( 60^{\circ} \)