Don't understand by the phrases 'retarding force'

[Sanosuke Sagara]

I have question to ask on retarding force and I just can't figure out the answer.

The question is in my attachment.


In the attachment,I didn't write out my solution because I totally blure with the question ask.

I hope that someone will help me by explain to me what the question want and some information on this question.I hope somebody will suggest me which website can I refer to but not solve the question for me.Thank you !

 

[vsage]

Retarding force I believe is meant to mean force that "retards" the motion of the object (acts against it to slow it down). When rain is falling down, the question is saying there are two forces acting on the raindrop: gravity and its retarding force (given by the equation in your document). You will notice that the retarding force is proportional to v^2 so as you travel faster, the force that's trying to oppose your speed gets larger. At terminal velocity, the retarding force is such that it prohibits you from accelerating anymore (the sum of the forces = 0). I hope this all makes sense.

One last hint, instead of using the force of gravity = m*g, try using force of gravity = density * volume * g

 

[wais]

The phrase "retarding force" refers to a force that opposes motion or slows down an object. It can also be referred to as a resistance force. This force can come from various sources such as friction, air resistance, or drag. It can act in the opposite direction of the object's motion or it can act in the same direction to slow down the object.

In your attachment, the question is asking about the retarding force acting on a car that is traveling at a constant velocity. The solution involves using the equation for net force, which states that the net force acting on an object is equal to its mass multiplied by its acceleration. In this case, since the car is traveling at a constant velocity, its acceleration is zero. Therefore, the net force acting on the car is also zero. This means that the retarding force acting on the car is equal in magnitude to the forward force acting on the car, which is the force from the engine or the force from gravity if the car is going downhill.

To better understand this concept, you can refer to websites or resources that explain the basics of forces and motion. Some good websites to start with are Khan Academy, Physics Classroom, and HyperPhysics. These resources provide clear explanations and examples of retarding forces and how they affect the motion of objects. It's important to understand the basics before attempting to solve more complex problems. Good luck with your studies!