Table of Contents
Why would a ball thrown up in the air fall to the ground?
The force of gravity causes objects to fall toward the center of Earth. The acceleration of free-falling objects is therefore called the acceleration due to gravity.
When you throw a ball up in the air what happens to it?
For example, when a ball is thrown up in the air, the ball’s velocity is initially upward. Since gravity pulls the object toward the earth with a constant acceleration g, the magnitude of velocity decreases as the ball approaches maximum height.
Why do I have flies in my car?
Yes, the waste inside your car attracts flies. These flies lay eggs inside your car. The flies’ eggs hatch within a day or two, causing the maggots to feed on the trash that’s inside your car. These maggots then form into pupae, a kind of cocoon, that they break through when they turn into adult flies.
What forces act on an accelerating car?
When the car accelerates , there is a horizontal forward force on the car, and a corresponding backwards horizontal force on the ground. As the car picks up speed, air resistance produces a backwards force. On the diagram we have drawn some forces offset from the center of mass, so that the vectors don’t overlap.
Why doesn’t the car move when you push from the inside?
Push on the car by the person and force exerted by the car on the person are though equal and opposite they are internal forces . an object can’t move under the influence of internal force.
Why don’t trains push the air inside the car when accelerating?
The reason is that the train pushes the air just as it pushes everything else. The air transmits the push by a pressure force, and there is no significant airflow inside the car when you start and stop, even at huge acceleration.
Will a ball land in a train car moving with constant velocity?
If I throw a ball straight up in an enclosed train car moving with constant velocity, I believe the basic physics books say it will land in the same spot. But will it really? I think I can say that the answer is “not in the real world”. Trivially, a train car is never enclosed.
Can a robot throw a ball in a completely air-tight carriage?
If we remove the passengers and have a trusty robot (who does not need oxygen) throw the ball up in a carriage that really is completely air-tight, I’m still not sure it will land in the same spot. I would imagine that there must still be air circulation. The train had to start from a stop.
Why are train cars never enclosed?
Trivially, a train car is never enclosed. Fresh air is being allowed into the carriage or the passengers would all die. Thus there’s currents of air that would affect the ball, agreed?