Statics
Physics ⇒ Mechanics
Statics starts at 9 and continues till grade 12.
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See sample questions for grade 12
Define the term 'couple' in the context of statics.
Describe the difference between static and dynamic equilibrium.
Describe the principle of transmissibility of forces.
Explain why a body with a wide base and low center of gravity is more stable than one with a narrow base and high center of gravity.
A 10 m long uniform beam weighing 500 N is supported at its ends. A 300 N weight is placed 2 m from the left end. Find the reaction at the left support.
A 2 m long uniform bar of mass 10 kg is supported at its ends. A 20 kg mass is suspended 0.5 m from the left end. Calculate the force at the right support. (Take g = 9.8 m/s²)
A 3 m long uniform rod of mass 6 kg is supported horizontally at its ends. A 12 kg mass is suspended 1 m from the left end. Calculate the force at the left support. (Take g = 9.8 m/s²)
A ladder of length 5 m and mass 20 kg rests against a smooth vertical wall, making an angle of 60° with the ground. If the ground is rough, calculate the minimum coefficient of friction required to prevent slipping. (Take g = 9.8 m/s²)
Which of the following best describes the moment of a couple?
(1) Product of one force and the distance between the forces
(2) Sum of the forces
(3) Product of both forces and the distance between them
(4) Difference between the forces
Which of the following is a correct statement about the center of mass?
(1) It is always located at the geometric center
(2) It is the point where the entire mass of a body can be considered to be concentrated for translational motion
(3) It is always outside the body
(4) It is the point where all forces act
Which of the following is NOT a necessary condition for static equilibrium?
(1) Net force is zero
(2) Net torque is zero
(3) Acceleration is non-zero
(4) The object is at rest
Which of the following is NOT a type of equilibrium?
(1) Stable equilibrium
(2) Unstable equilibrium
(3) Neutral equilibrium
(4) Rotational equilibrium
Fill in the blank: The algebraic sum of moments of all forces about any point in a plane is zero for a body in _______ equilibrium.
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 perpendicular distance from the axis of rotation to the line of action of the force is called the _______.
Fill in the blank: The SI unit of torque is _______.
True or False: In a couple, the net force is zero but the net torque is not zero.
True or False: The center of gravity and the center of mass always coincide for a body in a uniform gravitational field.
True or False: The center of gravity of a uniform rod lies at its midpoint.
True or False: The line of action of a force is the straight line along which the force acts.
