Question

The tension T in the quadriceps tendon as it passes over the knee cap is 1500 N. What is the magnitude and direction of the resultant force F exerted on the femur by the cap for the configuration shown in below figure? A garden cart loaded with firewood is being pushed horizontally when it encounters a step 8.0 cm high, as given below. The mass of the cart and its load is 55 kg, and the cart is balanced so that its center of mass is directly over the axle. The wheel diameter is 60 cm. In the event of getting the cart up the step, what are the major forces on the wheel? Calculate the moment of those forces about the center of the wheel, (you may keep the name of the force if you do not have numerical value in moment calculation, such as RF (reaction force), etc).

Answer 1

Efowa ETCeS30 +-T.cs 구o 1812 . I N NA

point 12th-が r-

加 eight- Tw + Mg·y2rh- rqve dve to w om ve dve to applied force- τ F -F, (r-h) → " With the wheel just about to pivot around the step, the net torque is exactly zero, so the minimum applied force needed to lift the wheel over the step is given by F-Mg\ Mg.NZrh_ h2 _ F . (r-h)-0 2r h-h? r- h