KINE 426-Laboratory
PROBLEM SET 4: vectors
GROUP ACTIVITY
Use the steps for formal problem solving shown in class! Draw a diagram for each problem!
MORE VECTOR PROBLEMS
1. A muscle is pulling at an angle of 75° to the orientation of the bone. If this muscle
is pulling at a distance of 6.0 cm from the joint with a force of 125 N, what is the torque
acting at the joint?
2. a. Draw and add the following vectors
1. +3 and +4
2. +8 and -15
3. -9 and -5
4. -3 and +2
b. Draw and substract the following vectors
1. +3 and +4
2. -8 and +3
3. -2 and -9
3. A football player is tackled by two linebackers simultaneously. Tackler A exerts a force of
400 N, and Tackler B exerts a force of 375 N. If the forces are perpendicular with each other, what
is the magnitude of the resultant force? What is the direction of the resultant force in reference to
Tackler A's line of force?
4. Ivan Rodriquez of the Detroit tigers is tagging up after a fly ball. Ken Griffey Jr. of the
Cincinnati Reds catches a baseball 250 feet from home plate and throws the ball at 38 m/sec
straight at home plate. If there is a 5 m/sec crosswind from left to right, how far immediately to the
right of home plate will the ball be caught by the catcher? (assume no air drag and the ball travels
in a straight line).
