Compare the biomechanical principles involved in safe pushing versus pulling movements. (5 marks)
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Detailed Sample Answer
Direction of force application differs
- Pushing: Force directed away from body’s center of mass
- Pulling: Force directed towards body’s center of mass
- Each requires different directional stability considerations
- Linear motion principles differ in each direction
Base of support position varies
- Pushing: Forward staggered stance with rear leg providing drive
- Pulling: Backward staggered stance with front leg anchoring
- Pushing requires more forward lean for force production
- Pulling requires more backward lean for counterbalance
Muscle recruitment patterns:
- Pushing: Primary use of chest, shoulders, triceps
- Pulling: Primary use of back, biceps, posterior chain
- Pushing emphasizes anterior chain activation
- Pulling emphasizes posterior chain activation
Joint stress considerations:
- Pushing places more stress on anterior shoulder joint
- Pulling creates more stress on posterior shoulder joint
- Different elbow joint angles required for each movement
- Spinal position must adjust for each movement type
Center of gravity adjustments:
- Pushing moves center of gravity forward of base
- Pulling requires center of gravity behind point of force application
- Balance requirements differ between movements
- Stability challenged differently in each movement
Show Worked Solution
Detailed Sample Answer
Direction of force application differs
- Pushing: Force directed away from body’s center of mass
- Pulling: Force directed towards body’s center of mass
- Each requires different directional stability considerations
- Linear motion principles differ in each direction
Base of support position varies
- Pushing: Forward staggered stance with rear leg providing drive
- Pulling: Backward staggered stance with front leg anchoring
- Pushing requires more forward lean for force production
- Pulling requires more backward lean for counterbalance
Muscle recruitment patterns:
- Pushing: Primary use of chest, shoulders, triceps
- Pulling: Primary use of back, biceps, posterior chain
- Pushing emphasizes anterior chain activation
- Pulling emphasizes posterior chain activation
Joint stress considerations:
- Pushing places more stress on anterior shoulder joint
- Pulling creates more stress on posterior shoulder joint
- Different elbow joint angles required for each movement
- Spinal position must adjust for each movement type
Center of gravity adjustments:
- Pushing moves center of gravity forward of base
- Pulling requires center of gravity behind point of force application
- Balance requirements differ between movements
- Stability challenged differently in each movement