physics

The forces acting on the arm of a person lifting a dumbbell. The force F is the force pulling on the hand due to the weight of the dumbbell, the force Warm is the weight of the arm and T is the tension due to the muscles connecting the arm and the trunk.
Question: Due to Newton's third law we can make the following statement:


The arm exerts on the trunk a force which equals - T.

The weight Warm is equal in magnitude to the tension T.

Forces Warm and T are a action/reaction pair of forces.

Forces Warm and F are a action/reaction pair of forces.

The weight of the arm has no reaction force.

  1. 👍
  2. 👎
  3. 👁
  1. without a picture, the question makes no sense. Forces are vectors, and have directions.

    1. 👍
    2. 👎
    👤
    bobpursley

Respond to this Question

First Name

Your Response

Similar Questions

  1. Science

    True / False: If a 40 kg person is accelerating at 10 m/s^2,then the magnitude of the force acting on him or her is 400 N. 1.How much force is needed to make a 60 kg object accelerate at a rate or 2.0 m/s ^2? 2.What is the

  2. science

    1.)a basketball momentarily changes shapes as it bounces off the floor. this is due to balanced forces acting on the ball. True (answer) false 2.) a ball slowing down as it roles across the carpet is an example of what ? (1 point)

  3. science

    a 5.o kg book is sitting on a table. which describes the forces acting on the book? a)there are no forces acting on the book b)the net force on the book is zero Since the weight of the book is cancelled out by the support of the

  4. physics

    3) A 5.0 kg book is sitting on a table. Which describes the force acting on the book a. there are no forces acting on the book b. the force of the table upward is greater than the force of gravity downward c. the net force on the

  1. physics

    Two forces act on an object. The magnitude of the net force acting on the object a. equals the sum of the magnitude of the two forces b. equals the difference in the magnitudes of the two forces c. equals the average of the two

  2. physics

    A large arm model was constructed with a free arm which weights 1 kg and has a center of gravity 12 cm from the pivot. a. if the force cord is attached 1 cm from the pivot, what force must be applied to support the free arm at 90

  3. Math (Pre Calc)

    If two forces of 5 lb. and 8 lb. are acting on the same point are equivalent to a single force of 10 lb., find the angle between the given forces, and the angle between the resultant and the larger force. I am not allowed to use

  4. Physics

    Consider a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Air resistance can be neglected. What force acts upon the coin while it moves

  1. science

    two forces,80N and 100N acting at an angle of 60° with each other,pull on an object what single force would replace the two forces

  2. physics

    A person pushes a 14.0-kg lawn mower at constant speed with a force of F = 88.0 N directed along the handle, which is at an angle of 45.0º to the horizontal (Fig. 4–45). (a) Draw the free-body diagram showing all forces acting

  3. woburn

    We consider a man of mass m = 77 kg as shown in the figure below using crutches. The crutches each make an angle of è = 26 with the vertical. Half of the person's weight is supported by the crutches, the other half is supported

  4. physics

    3 Fig. 3.1 shows the arm of a crane when it is lifting a heavy box. Fig. 3.1 (a) By the use of a scale diagram (not calculation) of the forces acting at P, find the weight of the box. [5]

You can view more similar questions or ask a new question.