Equilibrium of Forces
Physics ⇒ Mechanics
Equilibrium of Forces starts at 9 and continues till grade 12.
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See sample questions for grade 11
A ladder rests against a smooth wall and rough ground. Explain why friction acts at the base of the ladder and not at the wall.
Define the term 'couple' in the context of rotational equilibrium.
Describe the difference between concurrent and parallel forces in the context of equilibrium.
Explain the difference between static equilibrium and dynamic equilibrium.
A 10 kg mass is suspended by two ropes making angles of 30° and 60° with the ceiling. Calculate the tension in each rope. (Take g = 9.8 m/s²)
A 2 m long uniform plank weighing 100 N is supported at one end and at a point 0.5 m from the other end. If a 200 N load is placed at the free end, find the reactions at the supports.
A 5 m long uniform beam of weight 300 N is supported at its ends. A 600 N load is placed 2 m from the left end. Calculate the reactions at the supports.
A 50 N force acts at a distance of 0.4 m from a pivot. Calculate the moment of the force about the pivot.
Which law states that if three forces acting at a point are in equilibrium, they can be represented in magnitude and direction by the three sides of a triangle taken in order? (1) Newton's First Law (2) Triangle Law of Forces (3) Lami's Theorem (4) Parallelogram Law of Forces
Which of the following is an example of a body in stable equilibrium? (1) A ball at the top of a hill (2) A book lying flat on a table (3) A pencil balanced on its tip (4) A car on a slope
Which of the following is necessary for a body to be in static equilibrium? (1) Net force is zero (2) Net torque is zero (3) Both (1) and (2) (4) None of these
Which of the following is NOT a condition for equilibrium? (1) Net force is zero (2) Net torque is zero (3) Acceleration is maximum (4) Acceleration is zero
A body is acted upon by three forces in a plane. For the body to be in equilibrium, the vector sum of these forces must be ________.
Fill in the blank: For a body to be in rotational equilibrium, the algebraic sum of all ________ about any axis must be zero.
Fill in the blank: The point about which the total torque on a body is calculated is called the ________.
Fill in the blank: The tendency of a force to rotate a body about an axis is called ________.
True or False: A body in equilibrium must always be at rest.
True or False: If the net force on a body is zero, the body must be in equilibrium.
True or False: The center of gravity of a body must always lie within the material of the body.
True or False: The moment of a couple is independent of the point about which it is calculated.
