Forces and Their Effects on the Body – MCQs

1. Force is defined as:

(A) A push or pull that can change motion

(B) A measure of energy storage

(D) A property of matter

2. The SI unit of force is:

(A) Newton (N)

(B) Joule (J)

(D) Pascal (Pa)

3. Which law relates force, mass, and acceleration?

(A) Newton’s Second Law

(B) Newton’s First Law

(D) Law of Inertia

4. A force acting through a distance produces:

(A) Work

(B) Power

(D) Velocity

5. Torque is defined as:

(A) A turning effect of a force around an axis

(B) A straight-line displacement

(D) A measure of weight

6. Gravity acts on the body in which direction?

(A) Downward toward Earth’s center

(B) Upward from the ground

(D) Randomly distributed

7. The point where body weight is concentrated is called:

(A) Center of gravity

(B) Base of support

(D) Moment arm

8. The line of gravity must fall within the:

(A) Base of support

(B) Joint angle

(D) Kinetic chain

9. Stability increases when:

(A) Base of support is widened

(B) Center of gravity is raised

(D) Mass decreases

10. When two equal and opposite forces act simultaneously, they produce:

(A) Equilibrium

(B) Acceleration

(D) Translation

11. Shear force acts:

(A) Parallel to a surface

(B) Perpendicular to a surface

(D) Along the axis of rotation

12. Compressive forces act to:

(A) Push tissues together

(B) Pull tissues apart

(D) Cause sliding

13. Tensile forces act to:

(A) Pull tissues apart

(B) Push tissues together

(D) Create vibration

14. An external force applied to the body comes from:

(A) Gravity, ground reaction, resistance

(B) Muscle contractions

(D) Hormonal actions

15. Internal forces are primarily generated by:

(A) Muscle contractions

(B) Gravity

(D) Resistance bands

16. Friction acts:

(A) Opposite to motion

(B) In the same direction as motion

(D) Along the line of pull

17. Ground reaction force is explained by:

(A) Newton’s Third Law

(B) Newton’s First Law

(D) Law of gravitation

18. The tendency of a body to resist a change in motion is called:

(A) Inertia

(B) Momentum

(D) Force

19. Momentum is defined as:

(A) Mass × Velocity

(B) Mass × Acceleration

(D) Weight × Gravity

20. Impulse is:

(A) Force × Time

(B) Mass × Acceleration

(D) Velocity ÷ Time

21. A lever functions by converting:

(A) Forces into torques

(B) Mass into weight

(D) Friction into stability

22. The perpendicular distance from axis to line of force is:

(A) Moment arm

(B) Base of support

(D) Line of gravity

23. The effect of force depends on:

(A) Magnitude, direction, and point of application

(B) Color of the object

(D) Speed of thought

24. Muscles apply force through:

(A) Tendons

(B) Bones

(D) Cartilage

25. A larger moment arm results in:

(A) Greater torque production

(B) Less torque production

(D) Reduced stability

26. When the line of action passes through the axis, torque is:

(A) Zero

(B) Maximum

(D) Negative

27. The effect of gravity on body segments is called:

(A) Gravitational force

(B) Elastic force

(D) Inertial force

28. The base of support is increased by:

(A) Widening stance

(B) Raising arms

(D) Jumping

29. In biomechanics, force couples produce:

(A) Pure rotation

(B) Linear motion

(D) Translation

30. A joint dislocation often results from:

(A) Excess shear and tensile forces

(B) Increased compressive force

(D) Reduced torque

31. Which type of force stabilizes joints?

(A) Compressive

(B) Tensile

(D) Frictional

32. Which force increases risk of ligament injury?

(A) Shear force

(B) Compressive force

(D) Gravitational force

33. Mechanical stress is defined as:

(A) Force per unit area

(B) Work per second

(D) Mass per unit volume

34. Elastic deformation occurs when:

(A) Tissue returns to original shape after force

(B) Tissue permanently deforms

(D) Gravity is zero

35. Plastic deformation occurs when:

(A) Tissue is permanently deformed

(B) Tissue returns to shape

(D) Muscle shortens isometrically

36. Excessive loading on a joint can lead to:

(A) Injury and degeneration

(B) Improved stability

(D) Increased healing

37. Which of the following is a contact force?

(A) Friction

(B) Gravity

(D) Weight

38. Which of the following is a non-contact force?

(A) Gravity

(B) Friction

(D) Shear force

39. Static equilibrium occurs when:

(A) Net force and net torque = 0

(B) Net force is large

(D) Body is accelerating

40. Dynamic equilibrium occurs when:

(A) Constant velocity is maintained

(B) Acceleration = 0

(D) All of the above

41. In biomechanics, load is classified as:

(A) Compression, tension, shear, torsion, bending

(B) Torque only

(D) Momentum only

42. Which force is responsible for muscle fatigue during resistance training?

(A) Internal muscular force

(B) Frictional force

(D) Tensile force only

43. The center of pressure refers to:

(A) Point of application of ground reaction force

(B) Midpoint of body’s weight

(D) Force couple arm

44. Friction is necessary for:

(A) Walking and running

(B) Increasing weight

(D) Reducing stability

45. When equal forces act in opposite directions but not along same line, they produce:

(A) A couple (rotation)

(B) Linear acceleration

(D) Reduced torque

46. The greater the mass of an object:

(A) Greater force required to accelerate it

(B) Smaller force required

(D) Only torque required

47. Mechanical advantage of a lever depends on:

(A) Ratio of effort arm to resistance arm

(B) Mass × Acceleration

(D) Center of gravity height

48. When torque exceeds joint resistance, the result is:

(A) Joint movement

(B) Static balance

(D) Equilibrium

49. Which factor reduces stability most?

(A) Narrow base of support

(B) Lower center of gravity

(D) Line of gravity within base

50. Force applied rapidly over short time may cause:

(A) Injury due to high impulse

(B) Increased equilibrium

(D) Reduction in momentum

Forces and Their Effects on the Body: