Question

#4

For problem 3-5, consider a top-down view of a door, as shown below: -D 3.Where on the door (and in which direction) would you apply a force to exert the greatest torque? (The forces are shown in the sketch.) D) D A) A B)B ー.which of the forces result in the least amount of torque? ADA B) B C)cD E) Both A and D A s The torque from force C (end) is ded the torque from force B (mid point) double B) quadruple C) half D) a fourth E) the same as

Answer 1

Torque T = r×f = rf Sin@

In this case @ = 90°

=) T = rf

Now for f to be constant, Torque is directly proportional to distance r.

Hence for maximum torque, r must be maximum.

3.)

Point C will be point to produce maximum torque.

4.) For least amount of torque point D will be right because at this point @ = 0° , hence Sin 0 = 0

=) Torque = 0.

5.)

Since r at B is half of r at C

Hence torque from C is double of torque from B.