Lesson 1 Moment and Equilibrium

What is the formula to calculate the moment?

• moment = force × distance

• moment = mass × acceleration

• moment = speed × time

• moment = distance × time

Answer explanation

The correct formula to calculate the moment is 'moment = force × distance'. This relationship shows how the force applied at a distance from a pivot point creates a turning effect, known as moment or torque.

What happens when all forces acting on an object are balanced?

• The object is in equilibrium

• The object spins

• The object moves

• The object falls

Answer explanation

When all forces acting on an object are balanced, the object is in a state of equilibrium. This means it will not accelerate, spin, move, or fall, as the net force acting on it is zero.

What is the state of the beam if it is in equilibrium?

• It is falling

• It is spinning

• It is moving

• It is balanced

Answer explanation

A beam in equilibrium is not accelerating, which means it is balanced. It is neither falling, spinning, nor moving, as these states indicate a lack of equilibrium.

What is the first step in calculating the moment?

• Identify the forces

• Measure the distance

• Calculate the speed

• Count the mass

Answer explanation

The first step in calculating the moment is to identify the forces acting on the object. This is crucial as the moment is determined by the force applied and its distance from the pivot point.

What is the unit of moment?

• N

• m

• Nm

• kg

Answer explanation

The unit of moment, also known as torque, is measured in Newton-meters (Nm). This is derived from the force applied (in Newtons) multiplied by the distance from the pivot point (in meters). Thus, the correct answer is Nm.