Simple Physics Help: Understanding Force in Motion | Refresh Your Memory

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In summary, the conversation is about calculating the force needed to lift an object at a constant velocity using a simple pulley system. The initial force would need to be greater than the object's gravitational force, but once the object reaches its desired velocity, the force would only need to be equivalent to the gravitational force to maintain constant velocity. This eliminates the need for acceleration and allows the object to continue traveling upward at a constant velocity.
  • #1
skyguy
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need some help to refresh my memory.

was just doing some specification checking... when the motor is to lift a weight...

let say the weight is to be move at 2m/s with 2sec when it start... and stay at 2m/s throughout after that...

the initial force would be F = ma + (Watever force it need to overcome)
where ma = m (dv/dt) ... simple

ok now the question... after it have reach the 2m/s velocity should the force F be
F = (watever force it need to overcome) only ?... coz i don't need any more acceleration and just constant speed
 
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  • #2
Well, yes let's assume you want to lift an object with just a pulley. The initial lifting of the object as you stated would need more than the objects gravitational force. Then to have the object lift at a constant velocity the force would just need to be equivalent to the gravitational force upward. The mass would then have no acceleration/net force and thanks to the laws of inertia would be able to continue traveling upward at a constant velocity.
 
  • #3
thanks... u safe me lots of trouble
 

1. What is the difference between force and motion?

Force is a push or pull on an object, while motion is the movement of an object from one place to another.

2. How is force measured?

Force is measured in units called Newtons (N) using a tool called a spring scale.

3. What are the three types of motion?

The three types of motion are linear motion (movement in a straight line), rotational motion (movement around an axis), and oscillatory motion (back and forth movement).

4. How does force affect an object's motion?

According to Newton's First Law of Motion, an object will remain at rest or continue moving at a constant velocity unless acted upon by an unbalanced force. Therefore, force can either cause an object to start moving, stop moving, or change its direction or speed.

5. What is inertia and how does it relate to force and motion?

Inertia is an object's tendency to resist changes in its motion. The greater an object's mass, the greater its inertia. This means that a greater force is needed to change the motion of an object with more mass compared to an object with less mass.

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