10 Questions
| Attempts: 291

Questions and Answers

- 1.
*What is the moment of a force?* - 2.A non uniform beam AB of mass 20kg and length 12m has an object of mass 40kg placed at a point 8m from A. The beam is in equilibrium in a horizontal position resting on a support C at the midpoint of AB. Find the position of the centre of mass.Ans: y=4m
- 3.A uniform rod AB of weight 70N and length 5m. It rests in a horizontal position supported at point C and D, where AC = 0.4m. the reaction on the rod at C has magnitude 9N. Find a) the magnitude of the reaction on the rod at D b) the distance AD.
- 4.A uniform rod AB of length 6m and mass 40Kg. It is supported by two smooth pivots in a horizontal position at A and C where AC = 3m. A woman! of mass 75Kg stands on the rod which remains in equilibrium. The magnitudes of the reactions at the two pivots are equal to R Newtons.Find a) the value of R. b) the distance of the woman from A.
- 5.A non uniform plank of wood AB of length 10m and mass 100Kg. The plank is smoothly supported in a horizontal position at A and B. An object of mass 90Kg is put on the plank at C, where AC = 6m. The plank is in equilibrium and the magnitudes of the reactions at A and B are equal . Find: a) the magnitude of the reaction R, on the plank at B. b) the distance, x, of the centre of mass of the plank from A.
- 6.The turning effect of a force on a door is greater when it is applied at
- A.
A point near the hinges and perpendicular to the door

- B.
A point near the hinges and parallel to the door

- C.
a point far away from the hinges and perpendicular to the door

- D.
A point far away from the hinges and parallel to the door

- 7.Two equal and oppositely directed forces acting on an object will be in equilibrium
- A.
Only if they act on the same point on the object

- B.
if they are separated by a distance

- C.
When they are balanced by a third force

- D.
When their moments about the same point are equal

- 8.The cone is in ____________ because if it is tilted slightly, it returns to its _______________________
- 9.The diagram shows a light beam pivoted at one end. What is the effort required to lift the load?
- A.
50

- B.
67

- C.
100

- D.
200

- 10.Jack has a weight of 300 N and sits 2.0 m from the pivot of see-saw. Jill has a weight of 450 N and sits 1.5 m from pivot. Who will move down?
- A.
Jack

- B.
Jill

- C.
Both of them

- D.
None of them

World Environment Day Quiz: Beat Plastic Pollution Challenge
World Environment Day Quiz: Beat Plastic Pollution Challenge

The Ultimate Environment Quiz To Test Your Knowledge
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