Statics: Master the Forces Acting on Stationary Objects

Question 1

The moment of a force about a point is defined as the:

Accepted Answer

Product of the force and the perpendicular distance from the point to the line of action of the force

Answer

Sum of the forces acting on the point

Answer

Difference between the forces acting on the point

Answer

Ratio of the force to the distance from the point to the line of action of the force

Question 2

A 100 N force acts on a rigid object at a distance of 2 m from its pivot. Calculate the moment of force.

Accepted Answer

200 Nm

Answer

50 Nm

Answer

100 Nm

Answer

400 Nm

Question 3

Which is NOT an equilibrium condition?

Accepted Answer

Non-zero acceleration

Answer

Zero net force

Answer

Zero net moment

Answer

Constant energy

Question 4

A 10 kg block rests on a rough horizontal surface. With a coefficient of friction of 0.2, find the maximum force of friction.

Accepted Answer

20 N

Answer

10 N

Answer

50 N

Answer

100 N

Question 5

A machine with a mechanical advantage of 4 is used to lift a 200 kg load. What is the required effort force?

Accepted Answer

50 kg

Answer

100 kg

Answer

200 kg

Answer

800 kg

Question 6

Which is a vector quantity?

Accepted Answer

Force

Answer

Distance

Answer

Temperature

Answer

Mass

Question 7

A particle moves in a circular path at a constant speed. Which force acts on it?

Accepted Answer

Centripetal force

Answer

Centrifugal force

Answer

Gravitational force

Answer

Friction force

Question 8

Which of the following is a vector quantity in mechanics?

Accepted Answer

Speed

Answer

Distance

Answer

Time

Answer

Mass

Question 9

Which of the following is a unit of force?

Accepted Answer

Newton

Answer

Joule

Answer

Watt

Answer

Kilogram

Question 10

Identify the condition that must be met for an object to be in equilibrium:

Accepted Answer

Zero net force acting on the object

Answer

Stationary center of mass

Answer

Constant velocity

Answer

Zero acceleration

Question 11

Provide an example of an unstable equilibrium:

Accepted Answer

Cone balanced on its tip

Answer

Ball resting on a flat surface

Answer

Book positioned upright on a shelf

Answer

Car parked on an inclined slope

Question 12

Identify the quantity that is a vector:

Accepted Answer

Acceleration

Answer

Distance

Answer

Speed

Answer

Mass

Question 13

Define a free body diagram:

Accepted Answer

Diagram representing all external forces acting on an object

Answer

Diagram depicting the object in its context

Answer

Diagram showing the object's motion

Answer

Diagram illustrating the object's position

Question 14

Interpret the significance of a coefficient of friction of 0.2:

Accepted Answer

20% of the normal force is required to counteract friction

Answer

50% of the normal force is required to counteract friction

Answer

75% of the normal force is required to counteract friction

Answer

100% of the normal force is required to counteract friction

Question 15

A force is defined as a vector quantity because it possesses both:

Accepted Answer

Magnitude and direction

Answer

Displacement and velocity

Answer

Magnitude and displacement

Answer

Direction and displacement

Question 16

For a rigid body to be in equilibrium, which condition must be satisfied?

Accepted Answer

Both the net force and the net torque acting on the body are zero.

Answer

The net force acting on the body is zero, but not the net torque.

Answer

Either the net force or the net torque acting on the body is zero.

Answer

The net torque acting on the body is zero, but not the net force.

Question 17

For a simply supported beam carrying a point load at its center, where will the maximum bending moment occur?

Accepted Answer

At the center of the beam

Answer

At the supports of the beam

Answer

At one-half of the beam length from the supports

Answer

At one-quarter of the beam length from the supports

Question 18

A free-body diagram is:

Accepted Answer

A diagram that represents the forces acting on a particular object, isolated from its surroundings.

Answer

A diagram illustrating the relationship between force, mass, and acceleration.

Answer

A diagram showing the motion of an object in different positions.

Answer

A diagram that shows the internal structure of an object.

Question 19

What is the primary purpose of a truss?

Accepted Answer

To withstand external loads by transferring forces through its members.

Answer

To provide a rigid foundation for heavy machinery.

Answer

To create a stable platform for vehicles.

Answer

To store and release energy

Question 20

The center of gravity of a body is the point where:

Accepted Answer

The resultant force of gravity acting on the body passes through.

Answer

The body's weight is evenly distributed.

Answer

The mass of the body is concentrated.

Answer

The body is most stable.

Question 21

Which of the following describes a body in equilibrium?

Accepted Answer

The net force acting on it is zero.

Answer

The net force acting on it is to the left.

Answer

The net force acting on it is upward.

Answer

The net force acting on it is downward.

Question 22

The moment of a force about a point is defined as:

Accepted Answer

The product of the force and the perpendicular distance from the point to the line of action of the force.

Answer

The sum of the forces acting on the point.

Question 23

A couple is characterized by:

Accepted Answer

Two equal and opposite forces with a non-zero moment about a point.

Answer

Two forces with different magnitudes.

Answer

Two forces acting on the same point.

Answer

Two forces with a zero moment about a point.

Question 24

Friction is a force that:

Accepted Answer

Opposes the relative motion or potential relative motion of two surfaces in contact.

Answer

Is always greater than the force applied to a surface.

Answer

Acts in the same direction as the relative motion or potential relative motion of two surfaces in contact.

Question 25

The coefficient of friction is:

Accepted Answer

A measure of the roughness of two surfaces in contact.

Answer

The distance over which friction acts.

Answer

The force required to overcome friction.

Question 26

A body is in limiting equilibrium when:

Accepted Answer

It is on the verge of moving.

Answer

It is accelerating.

Answer

It is moving at a constant speed.

Answer

It is at rest.

Question 27

The efficiency of a machine is:

Accepted Answer

The ratio of the useful work output to the total work input.

Answer

The ratio of the total work input to the useful work output.

Answer

The difference between the useful work output and the total work input.

Question 28

Which of the following is NOT a type of simple machine?

Accepted Answer

A spring

Answer

A screw

Answer

A pulley

Answer

A lever