A rigid body can be considered to be made up of a number of particles. Which of

Question

A rigid body can be considered to be made up of a number of particles. Which of these statements best describes the internal forces between these particles?

a)The internal forces are action–reaction pairs and cancel out.

b)The sum of all the internal forces represents the net force of the body.

c)The sum of all the internal forces represents the force of the body’s center of mass.

d)The internal forces are in opposite direction to the direction of the body’s net force.

a)The internal forces are action–reaction pairs and cancel out.

b)The sum of all the internal forces represents the net force of the body.

c)The sum of all the internal forces represents the force of the body’s center of mass.

d)The internal forces are in opposite direction to the direction of the body’s net force.

Explanation / Answer

As we know that, according to Newton's third law of motion, if one particle apply force on other, the same force acting by the othe paricle on first one but opposite in direction. We can call them action-reaction pair.

When we define rigid body, the seperation between any two particles of rigid body is always constant. So even body is in motion, there is no seperation. So for given question option a is best which the internal forces between these particles

a)The internal forces are action–reaction pairs and cancel out.

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