subject

Equilibrium of Forces

Physics ⇒ Mechanics

Equilibrium of Forces starts at 9 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Equilibrium of Forces. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
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?
A force of 20 N acts at a point making an angle of 60° with the horizontal. Find its horizontal and vertical components.
A signboard of mass 50 kg is suspended by two ropes making angles of 30° and 60° with the horizontal. Find the tension in each rope.
A uniform beam of length 4 m and mass 20 kg is supported at its ends. A 40 kg mass is placed 1 m from the left end. Calculate the reaction forces at the supports.
A uniform meter rule is balanced at the 40 cm mark when a 100 g mass is hung at the 10 cm mark. Find the mass of the meter rule.
A uniform rod of length 2 m and weight 100 N is supported horizontally at its ends. A weight of 200 N is suspended at a point 0.5 m from one end. Find the reactions at the supports.
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.
Explain why a ladder leaning against a wall does not slip if the friction is sufficient.
State Lami's theorem.
State the conditions necessary for a body to be in mechanical equilibrium.
State the principle of moments.
A 2 m long uniform rod of mass 8 kg is supported horizontally by two vertical strings at its ends. A 12 kg mass is suspended from the rod at a point 0.5 m from the left end. Calculate the tension in each string.
A body is in equilibrium under the action of four coplanar forces. If three of the forces are 10 N, 15 N, and 20 N, acting at angles of 0°, 90°, and 225° respectively from the positive x-axis, determine the magnitude and direction of the fourth force.
A uniform ladder of length 6 m and mass 30 kg rests against a smooth vertical wall, making an angle of 60° with the horizontal. The coefficient of friction between the ladder and the ground is 0.4. Calculate the minimum horizontal distance from the base at which a 70 kg person can stand before the ladder begins to slip.