Moments of Force and Equilibrium: Master the Basics with Interactive Quizzes

Question 1

The moment of force about a given point is calculated as:

Accepted Answer

Force × perpendicular distance from the point to the force's line of action

Answer

Force × angle between the force and the perpendicular distance

Answer

Force × weight of the object

Answer

Perpendicular distance × weight of the object

Question 2

Antagonistic muscle pairs primarily function to:

Accepted Answer

Allow for precise and controlled movement

Answer

Increase joint stability

Answer

Prevent muscle imbalances

Answer

Generate high force output

Question 3

Which of the following is not a type of synovial joint movement?

Accepted Answer

Pronation

Answer

Flexion

Answer

Extension

Answer

Abduction

Question 4

A fundamental principle of biomechanics states that:

Accepted Answer

The body can be analyzed as a system of levers and pulleys

Answer

Muscle force is the only source of movement

Answer

Movement is always efficient and effortless

Answer

The body is an open system that exchanges energy with its surroundings

Question 5

Dynamic equilibrium differs from static equilibrium in that:

Accepted Answer

Dynamic equilibrium involves movement, while static equilibrium does not

Answer

Static equilibrium involves more force than dynamic equilibrium

Answer

Dynamic equilibrium occurs when the center of gravity is outside the base of support

Answer

Static equilibrium is impossible to maintain

Question 6

Which of the following factors does NOT influence the magnitude of a moment of force?

Accepted Answer

Object weight

Answer

Force magnitude

Answer

Distance from the pivot point

Answer

Force direction

Question 7

A gymnast performs a handstand on a balance beam. What equilibrium type does she demonstrate?

Accepted Answer

Stable

Answer

Unstable

Answer

Neutral

Answer

Dynamic

Question 8

What is the relationship between moment of force and angular acceleration?

Accepted Answer

Directly proportional

Answer

Inversely proportional

Answer

No relationship

Answer

Depends on object mass

Question 9

Which unit is used to measure torque?

Accepted Answer

Newton-meter

Answer

Newton

Answer

Meter

Answer

Radian

Question 10

Which factor does NOT affect the equilibrium of an object?

Accepted Answer

Speed

Answer

Gravity

Answer

Friction

Answer

Center of gravity

Question 11

For a gymnast to remain balanced on a balance beam, what must be ensured?

Accepted Answer

The sum of clockwise moments equals the sum of anticlockwise moments.

Answer

The center of gravity is below the pivot point.

Answer

The force on one side of the beam is greater than the force on the other.

Answer

The distance from the pivot point to the force is the same on both sides.

Question 12

Which notion about moments of force is incorrect?

Accepted Answer

Counter-clockwise rotation is always the direction of rotation.

Answer

Moments of force are only applicable to rotating objects.

Answer

Equilibrium occurs when the net moment of force is zero.

Answer

The moment of force is directly proportional to the applied force.

Question 13

Which handstand position provides the greatest stability?

Accepted Answer

Arms and legs extended wide apart

Answer

Arms and legs close together

Answer

Only arms extended

Answer

Only legs extended

Question 14

How does the moment of force acting on a joint influence the range of motion at that joint? Provide a real-world example from a specific sport to illustrate your answer.

Accepted Answer

The moment of force can either increase or decrease the range of motion at a joint, depending on the direction of the force.

Answer

The moment of force has no impact on the range of motion at a joint.

Answer

The moment of force only affects the range of motion of hinge joints, not ball-and-socket joints.

Answer

The range of motion at a joint is solely determined by the flexibility of the muscles surrounding the joint.

Question 15

What is the SI unit for moment of force?

Accepted Answer

Nm

Answer

N

Answer

J

Answer

m

Question 16

A person is standing on one leg. To maintain balance, they must have an equal and opposite moment of force generated by the other leg. True or False?

Accepted Answer

True

Answer

False

Answer

None of the given options

Answer

None of the given options

Question 17

A gymnast performs a handstand on a balance beam. The gymnast's center of mass is directly above the point of support. What type of equilibrium is this?

Accepted Answer

Stable

Answer

Unstable

Answer

Indifferent

Answer

Dynamic

Question 18

Which of the following activities requires the greatest stability?

Accepted Answer

Performing a one-legged squat

Answer

Cycling

Answer

Swimming

Answer

Walking

Question 19

A lever is used to lift a heavy object. The lever arm on the effort side is longer than the lever arm on the load side. What is the mechanical advantage of this lever?

Accepted Answer

Greater than 1

Answer

None of the given options

Answer

Equal to 1

Answer

Less than 1

Question 20

The concept of equilibrium refers to a state where:

Accepted Answer

The sum of clockwise moments is equal to the sum of counter-clockwise moments.

Answer

The body is in constant motion.

Answer

The body experiences only horizontal forces.

Question 21

A person holds a 100 kg barbell with each hand at a distance of 0.5 meters from its center. Calculate the magnitude of the moment of force created.

Accepted Answer

50 newton-meters (Nm)

Answer

25 Nm

Answer

100 Nm

Question 22

Which force primarily helps a gymnast maintain equilibrium during a handstand on a balance beam?

Accepted Answer

Reaction force from the balance beam.

Answer

Centripetal force.

Answer

Force of friction between the hands and the beam.

Answer

Gravitational force.

Question 23

Stable equilibrium is exemplified by:

Accepted Answer

A ball resting at the lowest point of a bowl.

Answer

A pencil balanced vertically on its tip.

Answer

A person standing on one leg.

Answer

A person riding a bicycle.

Question 24

A person applies a force of 50 N to a door at a distance of 0.75 meters from its hinges. The door's width is 1 meter. Calculate the moment of force acting on the door.

Accepted Answer

37.5 Nm

Answer

75 Nm

Answer

100 Nm

Answer

50 Nm

Question 25

To shift the center of gravity of an upright person towards their right foot, which action should they take?

Accepted Answer

Raising the left leg.

Answer

Shifting weight to the left foot.

Answer

Leaning to the left.

Answer

Raising both arms.

Question 26

At the moment of take-off during a backflip, which type of equilibrium does the gymnast's body experience?

Accepted Answer

Unstable equilibrium

Answer

Stable equilibrium

Answer

Indifferent equilibrium

Answer

Neutral equilibrium