3. (a) what is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? (b) during strenuous exercise it is possible to exert forces to the joints that are easily ten times greater than the weight being supported. what is the maximum force of friction under such conditions? the frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. increased frictional forces can cause further damage and pain.

1.state2.trash3.the earth

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction