Projectile Motion Equations: Checking Answers for Moving Objects

  • Thread starter Thread starter Melchior25
  • Start date Start date
AI Thread Summary
The discussion focuses on identifying which moving objects adhere to the equations of projectile motion. It confirms that a stone thrown underwater, a ball thrown in any direction, a jet airplane in flight, and a rocket after engine failure all follow these equations. However, a rocket leaving the launch pad does not qualify as it is influenced by thrust, which introduces additional forces. The key takeaway is that ideal projectile motion involves only one acting force, gravity, which must be considered when evaluating the scenarios. Understanding these principles is crucial for accurately applying projectile motion equations.
Melchior25
Messages
30
Reaction score
0
Could anyone please double check my answers to each of the following statements. Thanks

Homework Statement



Determine which of the following moving objects obey the equations of projectile motion.

True A stone is thrown under water.
True A ball is thrown in an arbitrary direction.
True A jet airplane crosses the sky with its engines thrusting the plane forward.
True A rocket moves through the sky after its engines have failed.
False A rocket leaves the launch pad.
 
Physics news on Phys.org
Melchior25 said:
Could anyone please double check my answers to each of the following statements. Thanks

Homework Statement



Determine which of the following moving objects obey the equations of projectile motion.

True A stone is thrown under water.
True A ball is thrown in an arbitrary direction.
True A jet airplane crosses the sky with its engines thrusting the plane forward.
True A rocket moves through the sky after its engines have failed.
False A rocket leaves the launch pad.
Not all your answers are correct, even when air resistance is neglected (which should have been stated in the problem). Hint: There is only one force acting on an object in ideal projectile motion problems. What is that force? How does it affect your answers?
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Similar threads

Is the y-component of projectile motion acceleration equal to gravity?
Replies
8
Views
2K
Projectile motion of a cannon ball versus time
Replies
15
Views
2K
Finding shortest distance between an observer and a moving object
Replies
13
Views
2K
Projectile Motion - object that is shot at an angle of 55 degrees
Replies
8
Views
2K
Vector Nature pf Projectile Motion
Replies
2
Views
1K
Stone being tossed from mountain Uni Physics with Calc
Replies
14
Views
2K
Projectile Motion Soccer Ball Problem
Replies
22
Views
5K
Conceptual Question on Projectile Motion
Replies
2
Views
3K
Effect of speed on horizontal displacement in projectile motion
Replies
4
Views
3K
Upward and downward movement of a rocket with the equation of motion
Replies
13
Views
2K

Hot Threads

Recent Insights

Back
Top