Question

Considerations for maintaining stability in Center of Gravity are:
A. Carry load close to the body
B. To lift load from the ground, bend knees and hip muscles while keeping back straight
C. For pushing load, apply force away from the center of gravity
D. To lift load from the ground, bend back and hip muscles while keeping knees straight
E. For pushing load, apply force at the center of gravity
Choose the correct answer from the options given below:

• A. A, B and C only
• B. A, B and D only
• C. C, D and E only
• D. A, B and E only

Hint:

Always lift with your legs, not your back.
Keep loads close to your body's midline to minimize the \enquote{lever arm} effect on your spine.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
Stability in body mechanics is achieved by keeping the Center of Gravity (COG) low and maintaining the line of gravity within the base of support.
This is vital for Work Simplification and preventing fatigue/injury in household management.

Step 2: Detailed Explanation:

• A. Carry load close to the body: This keeps the combined COG of the person and the load over the feet, reducing the torque on back muscles.

• B. Correct Lifting: Bending knees and hips (lowering the body) keeps the COG low and uses strong leg muscles instead of the back. Keeping the back straight prevents spinal injury.

• E. Applying force at COG: When pushing, applying force at the COG of the object ensures it moves forward efficiently without tipping.

• Exclusion: Bending the back with straight knees (D) shifts the COG dangerously and causes back strain. Applying force away from the COG (C) causes rotation rather than translation.

Step 3: Final Answer:
The safe and stable practices are A, B, and E.
Thus, the correct answer is D.