Measuring forces exerted by muscles

9.A triceps applies a moment of 60 Nm at a distance of 0.4 m from the elbow. Calculate the force.

10.A person holds a 100 N weight with the forearm horizontal. The biceps muscle inserts 0.05 m from the elbow, and the weight is 0.4 m from the elbow. What is the force exerted by the biceps?

11.Which of the following statements is false?

12.A weight is held stationary in the hand. If the distance from the elbow to the weight is doubled, and the force exerted by the biceps remains the same, what happens to the moment about the elbow?

13.A moment is the turning effect of a force around a point. Which of the following is the correct equation for calculating a moment?

14.What are the correct units for a moment?

15.To directly measure the size of a force applied by a muscle, which piece of equipment could be used?

16.In a biceps curl, a person holds a 100 N weight stationary. What is the upward force applied by the biceps?

17.A person holds a 50 N weight stationary in their hand. The distance from the elbow to the weight is 0.4 m. What is the moment of the weight about the elbow?

18.A person's hamstring applies a moment of 1200 Nm at a distance of 0.6 m from the knee. What is the force applied by the hamstring?

19.A person's biceps applies a moment of 120 Nm at a distance of 0.5 m from the elbow. What is the force applied by the biceps?

20.A person's triceps applies a moment of 60 Nm at a distance of 0.4 m from the elbow. What is the force applied by the triceps?

21.A person holds a 200 N weight with their forearm horizontal. The biceps muscle inserts 0.04 m from the elbow, and the weight is 0.35 m from the elbow. What is the force exerted by the biceps to hold the weight stationary? (Assume the forearm is weightless and the system is in equilibrium.)

22.In a biceps curl, the distance from the elbow to the weight is 0.4 m. The biceps muscle inserts 0.05 m from the elbow. If the biceps exerts a force of 500 N, what is the maximum weight that can be held stationary? (Assume the forearm is weightless.)

23.A student measures the moment of a weight about the elbow as 30 Nm. If the distance from the elbow to the weight is 0.25 m, what is the weight?

24.A person performs a biceps curl with a weight of 80 N. The biceps muscle inserts 0.03 m from the elbow. The weight is held at a distance of 0.3 m from the elbow. What is the moment of the weight about the elbow?

25.A student wants to measure the force exerted by their biceps muscle directly. Which piece of equipment should they use?

26.A student performs a biceps curl holding a weight. The distance from the elbow to the weight is 0.3 m. The biceps muscle inserts 0.04 m from the elbow. If the biceps exerts a force of 400 N, what is the maximum weight that can be lifted? (Assume the system is in equilibrium.)

27.In an experiment to measure the force exerted by the biceps, a student holds a 50 N weight stationary. The distance from the elbow to the weight is 0.4 m. The biceps insertion is 0.05 m from the elbow. What is the force exerted by the biceps?

28.A student sets up an experiment to measure the force exerted by a muscle using a spring balance. They attach the spring balance to the muscle's tendon and measure the force when the muscle contracts. Which of the following is a potential source of error in this measurement?

29.Which of the following is the correct equation for calculating a moment?

30.A person holds a 60 N weight stationary. The distance from the elbow to the weight is 0.35 m. What is the moment of the weight about the elbow?

31.A student investigates the relationship between the force exerted by a muscle and the angle of the joint. They measure the force at different angles. Which variable should be plotted on the y-axis of a graph?

32.In an experiment to measure the force exerted by the hamstring, a student applies a moment of 1500 Nm at a distance of 0.5 m from the knee. What is the force applied by the hamstring?

33.A student uses a Newton meter to measure the force exerted by their biceps. They record a force of 150 N. However, they later realise that the Newton meter was not zeroed correctly and reads 10 N when no force is applied. What is the actual force exerted by the biceps?

34.Which of the following statements about moments is true?

35.A student conducts an experiment to measure the force exerted by their biceps. They hold a weight stationary and measure the distance from the elbow to the weight. They then calculate the moment. What additional measurement is needed to determine the force exerted by the biceps?

36.What is a moment?

37.A person holds a weight stationary. Which statement about the force exerted by the biceps is correct?

38.A biceps curl is performed with a weight. The distance from the elbow to the weight is 0.4 m. The biceps muscle inserts 0.05 m from the elbow. If the biceps exerts a force of 500 N, what is the moment about the elbow?

39.In an experiment to measure the force exerted by the biceps, a student holds a 50 N weight stationary. The distance from the elbow to the weight is 0.4 m. The biceps muscle inserts 0.05 m from the elbow. What is the force exerted by the biceps?

40.A student measures the moment produced by a muscle as 80 Nm. The perpendicular distance from the joint to the muscle's attachment point is 0.2 m. What is the force exerted by the muscle?