Consider a person holding a bag like in the diagram, palm facing upwards, forearm parallel to the floor, and upper arm making a right angle with their forearm. Masses are added to the bag until the subject can no longer comfortably keep the angle between their upper arm and forearm at 90 degrees.
Weight of person: 170 lbs (756.5 N)
Body Segment and Percentage Amount of Total Body Weight
Head( 7.3%), Hand(0.7%), Trunk(50.7%) Thigh(10.3%), Upper Arm(2.6%)
Calf(4.3%), (Forearm1.6%), Foot(1.5%)
Homework Answers
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Consider a person holding a bag like in the diagram, palm facing
upwards, forearm parallel to...
The diagram above shows a side view of a person’s arm. The forearm and hand together...
The diagram above shows a side view of a person’s arm. The
forearm and hand together weigh 19N (WFH = 19N). The
center of gravity at point T is located 24cm from
the elbow joint. The person is holding a bowling ball 38cm from the
elbow and the ball weighs 47N (WB = 47N).
(a) Calculate the torque produced by the weight of the forearm
and hand about the elbow joint. Include the direction of the
torque.
(b) Calculate the...
A person with their upper arm vertical and their forearm horizontal holds a 4.5-kg iron cannon...
A person with their upper arm vertical and their forearm horizontal holds a 4.5-kg iron cannon ball as shown in the figure below. Assume the mass of the forearm and hand is 1.5 kg, with a center of mass 15 cm from the elbow. The center of the cannonball is 32 cm from the elbow, and the force of the biceps is applied 5.0 cm from the elbow. What force is exerted by the bicep? Elbow contact point 4.5 kg...
3) Bicep Curls Your elbow is the pivot point for your forearm. Your bicep attaches to...
3) Bicep Curls Your elbow is the pivot point for your forearm. Your bicep attaches to your forearm at 0.05m. Your forearm is nominally 0.35m to the center of your hand, where you hold a weight the Earth on your forearm is 12N. a) Draw a free body diagram and an EFBD for when your forearm is parallel to the ground. b) The system is in static equilibrium. Sum the torques and the forces. Make sure you identify them all....
An athlete is measuring the force by their flexor muscle by pulling a rope horizontally at...
An athlete is measuring the force by their flexor muscle by pulling a rope horizontally at a constant force. While pulling the rope the muscle applies a force on the forearm an angle of 71° as shown in the diagram. While keeping your forearm completely vertical, the tension in the rope is at 185N. The athlete's muscle is attached to the forearm 5 cm from the elbow joint and that the weight of your forearm is 22 N with a...
Consider the free-body diagram of a person holding a ball with their arm extended horizontally, as...
Consider the free-body diagram of a person holding a ball with their arm extended horizontally, as shown below on the left. The ball weighs WB 30 N, and is held at a distance d0.35 m from the elbow (E). The lower arm weighs WA 10N, with the center of mass distance 1- 0.15 m away from E. The biceps muscle applies a vertical upward force B to the lower arm at distance s - 0.03 m from E. a) What...
You are to assess the biomechanics of a male’s arm using his bicep to hold a...
You are to assess the biomechanics of a male’s arm using his bicep to hold a 20 kg object in his hand. The upper arm is perpendicular to the ground while the forearm is parallel to the ground. The male’s forearm is 26.5 cm long and weighs 1.42 kg. The man’s hand weighs 0.54 kg and is 19 cm long. The center of masses for the forearm and hand are 43% and 50% of the extremity lengths from the proximal...
2. Bill is holding a 12 kg barbell in his hand. His upper arm is perpendicular...
2. Bill is holding a 12 kg barbell in his hand. His upper arm is perpendicular to the ground, and his elbow is flexed to produce a 40º angle at the elbow joint. His forearm has a mass of 12 kg. The distance from the elbow joint to the weight in his hand is 35 cm. The center of mass (COM) of his forearm is located 14 cm from the elbow joint. Draw a free body diagram of this scenario....
1. (30 points) You are modeling the biceps of a new life-like robot you are designing. The geomet...
1. (30 points) You are modeling the biceps of a new life-like robot you are designing. The geometry of the arm has been defined as follow: Di - 5 cm, D2- 15 cm, D325 cm and D4- 18.66 cm (distances in the diagram are shown for the elbow positioned at 90°). The dumbbell weighs 7 kg and the weight of the forearm is 2 kg. (F - ma) a. Plot the moment arm values as a function of the angle...
Problem 5: A skeletal diagram of a hand holding a load is shown in the upper...
Problem 5: A skeletal diagram of a hand holding a load is shown in the upper figure. A mechanical model of the arm is shown in the lower figure. The load and the forearm have masses of 2 kg and 1.2 kg, respectively, and their centers of mass are located at Gi and G2. Determine the tensile force developed in the biceps CD and the reaction force at the elbow joint B. Express the reaction at B in vector format....
2. A person is holding a weight (100 N) in their hand. The weight is a...
2. A person is holding a weight (100 N) in their hand. The weight is a distance of 0.3 meters from the center of rotation of the elbow. If the forearm is parallel to the ground, what is the torque about the elbow due to the weight? If the forearm has an angle of 30° above the horizontal (hand is higher than elbow), what is the torque about the elbow due to the weight? c. If an elbow flexor muscle...
The diagram above shows a side view of a person’s arm. The
forearm and hand together weigh 19N (WFH = 19N). The
center of gravity at point T is located 24cm from
the elbow joint. The person is holding a bowling ball 38cm from the
elbow and the ball weighs 47N (WB = 47N).
(a) Calculate the torque produced by the weight of the forearm
and hand about the elbow joint. Include the direction of the
torque.
(b) Calculate the...
A person with their upper arm vertical and their forearm horizontal holds a 4.5-kg iron cannon ball as shown in the figure below. Assume the mass of the forearm and hand is 1.5 kg, with a center of mass 15 cm from the elbow. The center of the cannonball is 32 cm from the elbow, and the force of the biceps is applied 5.0 cm from the elbow. What force is exerted by the bicep? Elbow contact point 4.5 kg...
3) Bicep Curls Your elbow is the pivot point for your forearm. Your bicep attaches to your forearm at 0.05m. Your forearm is nominally 0.35m to the center of your hand, where you hold a weight the Earth on your forearm is 12N. a) Draw a free body diagram and an EFBD for when your forearm is parallel to the ground. b) The system is in static equilibrium. Sum the torques and the forces. Make sure you identify them all....
An athlete is measuring the force by their flexor muscle by pulling a rope horizontally at a constant force. While pulling the rope the muscle applies a force on the forearm an angle of 71° as shown in the diagram. While keeping your forearm completely vertical, the tension in the rope is at 185N. The athlete's muscle is attached to the forearm 5 cm from the elbow joint and that the weight of your forearm is 22 N with a...
Consider the free-body diagram of a person holding a ball with their arm extended horizontally, as shown below on the left. The ball weighs WB 30 N, and is held at a distance d0.35 m from the elbow (E). The lower arm weighs WA 10N, with the center of mass distance 1- 0.15 m away from E. The biceps muscle applies a vertical upward force B to the lower arm at distance s - 0.03 m from E. a) What...
1. (30 points) You are modeling the biceps of a new life-like robot you are designing. The geometry of the arm has been defined as follow: Di - 5 cm, D2- 15 cm, D325 cm and D4- 18.66 cm (distances in the diagram are shown for the elbow positioned at 90°). The dumbbell weighs 7 kg and the weight of the forearm is 2 kg. (F - ma) a. Plot the moment arm values as a function of the angle...
Problem 5: A skeletal diagram of a hand holding a load is shown in the upper figure. A mechanical model of the arm is shown in the lower figure. The load and the forearm have masses of 2 kg and 1.2 kg, respectively, and their centers of mass are located at Gi and G2. Determine the tensile force developed in the biceps CD and the reaction force at the elbow joint B. Express the reaction at B in vector format....
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