Mark each of the following statementsastrue or false. If a statement refers to "two objects"interactingvia some force, you are not to assume that these twoobjects havethe same mass.

You are watching: The two forces in each pair act in opposite directions.


The two forces in each pair may have different physicalorigins(for instance, one of the forces could be due to gravity,and itspair force could be a normal contact force).

The expression of the momentum is expresses as follows,

Here,

*
is the momentum,
*
is the mass of the object and is the velocity of the object.

Newton’s laws of motion,

1st law: A body in state of rest or of uniform motion continues to be in the same state unless and until compelled by an external force.


2nd law: The rate of change of momentum of a body is directly proportional to the force applied, and this change in momentum is in the direction of force applied.

*

Here,

*
is the final velocity of the object and
*
is the initial velocity of the object.

Since acceleration is defined as the time rate of change of velocity, we have

*

Here,

*
is the acceleration.

3rd law: All force between two objects exists in equal in magnitude and opposite in direction.


According to Newton’s third law, if two bodies are interacting with some force then force on these bodies can be expresses as follows,

Here, and indicate the two bodies where is the force on body due to body andis the force on body due to body which is the reaction force.

From the equation we can see that there is only one reaction force.

Therefore, every force has one and only one third law pair force.

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This is a True statement.


According to Newton’s third law, if two bodies are interacting with some force then force on these bodies can be written as,

Here, and indicate the two bodies where is the force on body due to body and is the force on body due to body which is the reaction force.