Statics
Physics ⇒ Mechanics
Statics starts at 9 and continues till grade 12.
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See sample questions for grade 9
Define the principle of moments.
Describe how the position of the center of gravity affects the stability of a vehicle.
Describe what happens to the stability of an object if its center of gravity is raised.
Explain the difference between stable, unstable, and neutral equilibrium.
A 10 N weight is suspended from a rope. What is the tension in the rope if the system is in equilibrium?
A 15 N force acts at an angle of 30° to a lever arm 0.5 m long. What is the effective moment produced? (Use sin 30° = 0.5)
A 50 N force acts perpendicular to a door 0.8 m from the hinge. What is the torque produced?
A force of 5 N acts at a distance of 2 m from a pivot. What is the moment produced?
Which of the following best describes a couple? (1) A single force acting at a point. (2) Two equal and opposite forces acting along the same line. (3) Two equal and opposite forces whose lines of action do not coincide. (4) Three forces acting at a point.
Which of the following best describes static equilibrium? (1) The object is moving at constant velocity. (2) The object is at rest and all forces and torques are balanced. (3) The object is accelerating. (4) The object is rotating.
Which of the following is a condition for rotational equilibrium? (1) The sum of all forces is zero. (2) The sum of all torques is zero. (3) The object is moving in a circle. (4) The object is at rest.
Which of the following is a correct unit for torque? (1) N·m (2) N/m (3) m/N (4) N·s
Fill in the blank: A body is said to be in ________ equilibrium if it returns to its original position after being slightly displaced.
Fill in the blank: The force that acts at a distance from the pivot and causes rotation is called ________.
Fill in the blank: The moment of a couple is equal to one of the forces multiplied by the ________ between their lines of action.
Fill in the blank: The perpendicular distance from the pivot to the line of action of the force is called the ________ arm.
True or False: An object in static equilibrium must have zero acceleration.
True or False: If the resultant force on a body is zero, the body must be at rest.
True or False: In a couple, the resultant force is zero but the resultant moment is not zero.
True or False: The center of mass and the center of gravity are always at the same point in a uniform gravitational field.
