Equilibrium of Forces
Physics ⇒ Mechanics
Equilibrium of Forces starts at 9 and continues till grade 12.
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Define the term 'couple' in the context of equilibrium of forces.
Describe the difference between stable, unstable, and neutral equilibrium with examples.
Explain the difference between static equilibrium and dynamic equilibrium.
Explain why a body suspended from a point will always come to rest with its center of gravity vertically below the point of suspension.
A 10 N force acts east and a 10 N force acts north on a point object. What is the magnitude and direction of the third force required to keep the object in equilibrium?
A 5 m long uniform beam of mass 100 kg is supported at its ends. A 200 kg mass is placed 2 m from the left end. Find the reactions at the supports.
A 60 kg person stands on a uniform plank of mass 20 kg and length 4 m, supported at both ends. The person stands 1 m from the left end. Calculate the force on each support.
A body is acted upon by two forces of 5 N and 12 N at right angles to each other. What is the magnitude of the resultant force required for equilibrium?
Which law is used to resolve forces into components for equilibrium analysis?
(1) Newton's First Law
(2) Newton's Second Law
(3) Lami's Theorem
(4) Hooke's Law
Which of the following is a correct statement about equilibrium?
(1) Only the net force must be zero
(2) Only the net torque must be zero
(3) Both net force and net torque must be zero
(4) Neither net force nor net torque must be zero
Which of the following is an example of a body in static equilibrium?
(1) A car moving at constant speed
(2) A book lying on a table
(3) A falling ball
(4) A spinning top
Which of the following is NOT a condition for equilibrium?
(1) Net force is zero
(2) Net torque is zero
(3) Acceleration is zero
(4) Net momentum is zero
Fill in the blank: The algebraic sum of the moments of all the forces about any point in equilibrium is ______.
Fill in the blank: The moment of a force about a point is equal to the ______ of the force and the perpendicular distance from the point to the line of action of the force.
Fill in the blank: The point about which the algebraic sum of moments of all forces is zero is called the ______ of equilibrium.
If three forces acting at a point are in equilibrium, then they can be represented in magnitude and direction by the sides of a ______ taken in order.
True or False: A body can be in equilibrium even if it is moving with constant velocity.
True or False: If the net force on a body is zero, the body must be at rest.
True or False: The center of gravity of a body must always lie within the material of the body.
True or False: The equilibrium of concurrent forces can be analyzed using the triangle law of forces.
