Two individuals, Ann and Lisa, are both holding a 10kg weight stationary in their hand with their forearm at a 90-degree angle to their body. Their bicep muscles generate similar force when they contract. Ann’s forearm is 18 cm long and her bicep inserts 3 cm from her elbow joint. Melissa’s forearm is 20 cm long and her bicep muscle inserts 4 cm from her elbow joint. Whose bicep needs to generate more force to hold the weight stationary? Explain your answer. Assuming their muscles contract at the same rate, who could move the weight the fastest? Explain your answer.
Two individuals, Ann and Lisa, are both holding a 10kg weight stationary in their hand with their forearm at a 90-degree angle to their body. Their bicep muscles generate similar force when they contract. Ann’s forearm is 18 cm long and her bicep inserts 3 cm from her elbow joint. Melissa’s forearm is 20 cm long and her bicep muscle inserts 4 cm from her elbow joint. Whose bicep needs to generate more force to hold the weight stationary? Explain your answer. Assuming their muscles contract at the same rate, who could move the weight the fastest? Explain your answer.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Two individuals, Ann and Lisa, are both holding a 10kg weight stationary in their hand with their forearm at a 90-degree angle to their body. Their bicep muscles generate similar force when they contract.
Ann’s forearm is 18 cm long and her bicep inserts 3 cm from her elbow joint.
Melissa’s forearm is 20 cm long and her bicep muscle inserts 4 cm from her elbow joint.
- Whose bicep needs to generate more force to hold the weight stationary? Explain your answer.
- Assuming their muscles contract at the same rate, who could move the weight the fastest? Explain your answer.
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