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2028 AL - Completed Lessons

2028 AL - Subject Introduction Special Session

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2028 AL - Lesson No 01 Area & Volume (Basic Mathematics)

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2028 AL - Lesson No 02 Measuring Instrument

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2028 AL - Lesson No 03
Force & Behaviors

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2028 AL | Mock Exam No 02

Sri Lankan No 01 SFT EM Class

1 / 20

One of the two mutually perpendicular components of a force has a magnitude of 10 N and it makes an angle of 60ยฐ with the force. The magnitude of the force is:

2 / 20

A uniform rod ST of length 4 m rests on two supports, U located 1 m from S, and V located 1 m from T. The weight of the rod is 150 N. What is the minimum force (F) that must be applied downwards at end T in order to just lift the rod off support U?

3 / 20

Two forces of 12 N and 5 N act on an object. If the directions in which these forces act can be varied, which of the following resultant force values can be obtained?
a. 17 N
b. 7 N
c. 5 N

4 / 20

A mass of 4 kg is placed on a rough horizontal surface, and a horizontal force of 9 N is applied to it. If the coefficient of static friction between the surface and the mass is 0.3, the frictional force acting on the mass is:

5 / 20

A box of mass 4 kg is at rest on a horizontal surface. The coefficient of static friction between the box and the surface is 0.8, and the coefficient of dynamic friction is 0.6. The horizontal force required to accelerate the box horizontally at 3 m sโปยฒ is:

6 / 20

When a load of 50 N is suspended in equilibrium by light inextensible strings, the tension in the horizontal string is:

7 / 20

An engine provides a force of 1000 N to a motor car. If the velocity of the motor car, which was initially at rest, increases to 16 m sโปยน in 8 seconds, the mass of the motor car is:

8 / 20

The value of the resultant force (R) of these two forces can be:

9 / 20

A horizontal rod of length 4 m and weight 60 N (mass 6 kg) is kept in equilibrium by hinging end A so that it can rotate freely about a fixed point, and tying end B to a string inclined at 60ยฐ to the horizontal. When the rod is in this position, the tension (T) in the string is:

10 / 20

3 N and 10 N are two parallel forces. Their resultant force is:

11 / 20

Two forces act at point P as shown in the figure. The resultant of these forces is:

12 / 20

The figures below show 5 pictures of identical mass hung on a wall using strings and pegs. Which diagram shows the arrangement where the tension in the string is minimum?

13 / 20

As shown in the figure, a force of 50 N acts at an angle of 60ยฐ to the horizontal on an object of mass 10 kg. If the coefficient of friction of the surface is 0.2, the acceleration acquired by the object is: (g = 10 m sโปยฒ)

14 / 20

An object is in equilibrium under the action of two forces. Then, of the two forces,

A. Magnitudes are equal to each other.

B. Directions act opposite to each other.

C. Lines of action are the same.

Which of these is/are always true?

15 / 20

As shown in the figure, two blocks A and B are connected to the two ends of an inextensible light string passing over a smooth pulley. The coefficient of friction between block A, which is at rest, and the horizontal surface is 0.2. If the mass of block A is 10 kg, the minimum mass that block B must have to move it is:

16 / 20

A concrete cylinder of weight W needs to be rolled from a lower horizontal surface onto a higher horizontal surface. The diagram shows the ways in which forces can be applied at positions A, B, C, D, and E on the cylinder. The application of force that requires the minimum magnitude to perform this task is:

17 / 20

When a force of 60 N acts on an object as shown in the diagram, the direction and magnitude of the moment created by this force about point A are:

 

18 / 20

In addition to the forces acting on the horizontal uniform rod shown in the figure, a clockwise Moment of force of 10 N m also acts on it. The resultant moment of the system about point O is:

 

 

19 / 20

Consider the following statements:

A. If the resultant of a system of forces acting on an object is not zero, the object moves linearly in the direction opposite to the resultant.
B. For an object to remain at rest under a system of forces, its resultant must be zero.
C. Resolution of forces is the reverse process of finding the resultant of forces.

Which of these is/are true?

20 / 20

Arrangement of three objects A, B and C attached by strings to two light rods is shown
in the figure. The distance between the objects and the supporting rope is indicated in the figure. If the mass of A is 10g, the mass of C for the arrangement to be in equilibrium as shown in the diagram,

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