Question

A couple produces

• A. purely translational motion
• B. purely rotational motion
• C. both translational and rotational motion
• D. no motion

Hint:

A couple defined more than two forces operating on a body in equal and opposing directions with an interval between their lines of action.

Answer 1

The Correct Option is B

A couple defined more than two forces operating on a body in equal and opposing directions with an interval between their lines of action.

The pair is exerting no force as a consequence. As a result, the item does not travel linearly. 

As a result, the coupling just causes the item to rotate.

Discover More Topics From This Chapter: System Of Particles & Rotational Motion
 

Answer 2

The Correct Answer is (B)

Real Life Applications

Few applications are: 

• The driver of an automobile turning the steering wheel.
• Turning on and off a water tap or adjusting an alarm clock's spring.
• Using a key to open the locker removing and replacing a water bottle or jug's cap.
• Disengaging a screwdriver.

Question can also be asked as

• What does a couple produce?
• What is the effect of a couple?
• What kind of motion does a couple produce?
• Can a couple produce linear motion?
• Can a couple produce rotational motion?
• What is the difference between a couple and a force?
• How does a couple produce torque?
• What are the applications of couples?

Answer 3

The Correct Answer is (B)

If both hands are free to operate a rod of length l. 

• One hand pulls on one of the rod's ends while the other hand pulls on the opposite hand.
• These two forces are of equal strength and move in the opposite direction.
• The item rotates as a result of these two forces.
• The pair of forces is expressed mathematically as τ=Fr
• where r is the distance and F is the force.

Calculation of Torque

• τ= F.r. sin can be used to refer to torque.
• The vector product of force and position vector, resulting in, τ = r x F

Calculation of Couple

• A pair is often a combination of two parallel, equal forces that act in opposition to one another.
• It has the same magnitude but travels in the opposite direction, as a result of a perpendicular distance.
• This equation, MC = r * F, frequently makes use of vector analysis.
• Now that both forces are acting at a considerable distance from one another, a moment is created.
• Any of the two forces produced by a couple multiplied by the product of their respective perpendicular distances can be used to determine a couple's moment.
• Couples and torque share some similarities.
• This indicates that they are both accountable for the creation of an object's rotating motion.
• The forces often experienced in a pair are of equal size but are directed in opposite directions, making the net resultant force zero.

Also Read: 

Related Topics
Unit of Torque	Torque Formula	Angular acceleration