Acceleration Part 3: Is Constant Ga Assumption Valid?

In summary, the conversation discusses the assumption made in part 1 of a physics problem regarding the constancy of acceleration. The assumption is valid when neglecting air resistance, as is the case in space. However, it is important to note that the equation used is only valid for constant acceleration without any external forces. It may be beneficial to continue each question in the same thread in the future.
  • #1
imy786
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Homework Statement



Reconsider the assumption made in part 1 regarding the constancy of ga. Briefly comment on the validity of this assumption.


Homework Equations



part 1-

https://www.physicsforums.com/showthread.php?t=161723

The Attempt at a Solution



The equation used is

s=ut+1/2 at2.

This equation is valid when neglecting air resistance. And is valid as there is no air resistance in space.


(is this correct)
 
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  • #2
More generally; the equation is valid for constant acceleration (i.e. there exist no external forces) which is the case in space.

(In future, it may be better to contine each question in the same thread!)
 
  • #3


I would like to clarify that the assumption of constant acceleration, or constant ga in this case, is only valid in certain scenarios. It is important to note that the equation s=ut+1/2 at^2 is valid only when there is no external force acting on the object and when air resistance is negligible. In the context of space, where there is no air resistance, this assumption is valid. However, in real-world situations, there are often external forces such as friction and air resistance that can affect the acceleration of an object. Therefore, it is important to consider these factors and make necessary adjustments to the equation in order to accurately describe the motion of an object. In summary, while the assumption of constant acceleration may be valid in certain ideal scenarios, it is important for scientists to carefully consider all factors and make appropriate adjustments to accurately describe the motion of an object.
 

1. What is the constant acceleration assumption in physics?

The constant acceleration assumption in physics is a simplification that is often used to make mathematical calculations easier. It assumes that the acceleration of an object remains constant over a given period of time, even though in reality, this may not be true.

2. Why is the constant acceleration assumption important?

The constant acceleration assumption is important because it allows us to use basic equations of motion to describe the behavior of objects in motion. This simplification is useful in many real-world applications, such as predicting the trajectory of a projectile or analyzing the motion of a car.

3. Is the constant acceleration assumption always valid?

No, the constant acceleration assumption is not always valid. In reality, many factors can affect the acceleration of an object, such as air resistance, friction, and changes in the object's mass. As a result, the acceleration may not remain constant over time.

4. When can we use the constant acceleration assumption?

The constant acceleration assumption can be used when the factors that may affect the acceleration of an object can be ignored or are negligible. For example, if the object is moving at a constant speed without any external forces acting on it, the constant acceleration assumption can be applied.

5. How can we determine if the constant acceleration assumption is valid?

To determine if the constant acceleration assumption is valid, we can compare the predicted motion of an object using the assumption with the actual motion of the object. If the two match closely, then the assumption is likely valid. However, if there are significant differences between the predicted and actual motion, then the assumption may not be valid and more complex equations or factors should be considered.

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