Motion, Strobe and Newton's Laws

[physicsidiot71784]

I have some questions that I need help answering and are due friday september 30th but i need the help to answer them. ok here goes. The question is What is the difference between motion at constant velocity and motion at constant acceleration? Explain your answer.
I say that there is no difference because motion at constant velocity and constant acceleration is zero. Is that right or is there someway you can help me understand.
The other question is if you have a baseball and a lead ball, that is much heavier, that is falling from the same height as the baseball, and the drag is negligible how would the strobe of the lead be different from the baseball strobe?
My answer to this was they would be the same. Our teacher said something about the weight has nothing to do with it. I am confused because I missed that day of lecture due to a sick kid. can you help me understand?
Another question was if a package is placed in a bed of a pickup truck and it slides towards the back when speeding up and towards the front when slowing down. Which Newtons law? apply it directly to the motion and explain why.
I think it is Newtons first law but the laws confuse me. I need help explaining the laws to answer this question.

 

[Andrew Mason]

I have some questions that I need help answering and are due friday september 30th but i need the help to answer them. ok here goes. The question is What is the difference between motion at constant velocity and motion at constant acceleration? Explain your answer.
I say that there is no difference because motion at constant velocity and constant acceleration is zero. Is that right or is there someway you can help me understand.

I am not sure what you mean by your answer. Motion at constant velocity (eg. 100 m/sec) is zero?

With constant (non-zero) acceleration, the velocity is continually changing. So if you measure the velocity at different times you will get different velocities. With constant velocity (0 acceleration) the velocity is the same at all times.

The other question is if you have a baseball and a lead ball, that is much heavier, that is falling from the same height as the baseball, and the drag is negligible how would the strobe of the lead be different from the baseball strobe?
My answer to this was they would be the same. Our teacher said something about the weight has nothing to do with it. I am confused because I missed that day of lecture due to a sick kid. can you help me understand?

This is just Galileo's 'time of fall' experiment. All objects fall with the same acceleration (g).

Another question was if a package is placed in a bed of a pickup truck and it slides towards the back when speeding up and towards the front when slowing down. Which Newtons law? apply it directly to the motion and explain why.
I think it is Newtons first law but the laws confuse me. I need help explaining the laws to answer this question.

It demonstrates Newton's first and second laws. The package is not attached to the truck. It is held on the bed by friction. If the truck engine applies force to the truck, the truck accelerates. But the package on the bed can only accelerate at the same rate if the force which the truck is exerting on the package (friction) is sufficient to accelerate the package at the same rate. Otherwise it maintains uniform motion (and the truck accelerates under it).

AM

 

[quicknote]

I am happy to help you understand these concepts and answer your questions. Let's start with the first one - the difference between motion at constant velocity and motion at constant acceleration.

Motion at constant velocity means that an object is moving at a steady speed in a straight line. This means that the object is not speeding up or slowing down, and it is not changing direction. On the other hand, motion at constant acceleration means that an object is changing its velocity (speed and/or direction) at a constant rate. This means that the object is either speeding up or slowing down, or changing direction, but the amount of change is consistent over time.

So, the main difference between the two is that motion at constant velocity has a constant speed and direction, while motion at constant acceleration has a changing speed and/or direction. For example, a car driving on a straight road at a steady speed has motion at constant velocity, while a car accelerating or decelerating on the same road has motion at constant acceleration.

Moving on to the second question about the strobe of a baseball and a lead ball. The weight of an object does not affect its strobe (or flash) rate. The strobe depends on the time it takes for the object to complete one full cycle of motion, which is determined by its speed and the distance it travels. In this case, both the baseball and lead ball are falling from the same height, so they will have the same strobe rate.

Lastly, for the question about the package sliding in the pickup truck, you are correct that it is related to Newton's first law of motion. This law states that an object at rest will remain at rest and an object in motion will continue in motion at a constant velocity unless acted upon by an external force. In this case, the package is at rest in the bed of the truck, but when the truck speeds up or slows down, an external force (the truck's acceleration) causes the package to also move in the same direction.

I hope this helps to clarify these concepts for you. Remember, if you have any further questions or need more help, don't hesitate to ask your teacher or a science tutor for assistance. Good luck with your assignment!