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The following description covers the region near the surface of the earth ... the neighborhood we live in. It also talks about objects that are just coasting, i.e. no strings attached, no propellers, jets, rockets etc. An object moving upward with no force on it other than gravity will 'decelerate', that is, its speed will decrease at the rate of 32 ft per second slower every second, until its upward speed is zero. From that instant, it will begin falling downward, just as if it had been dropped from that height, and its downward speed will begin to grow, at the rate of 32 ft per second faster every second.
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∙ 14y ago
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How does the graph of displacement vs. time look for something moving at a constant positive velocity?
An Upward Sloping Straight Line. <3
What is the vertical velocity of a projectile at the highest point in its trajectory?
The vertical velocity is zero at the highest point. It has ceased moving upward and will begin moving downward. Gravity and air resistance will have negated the original vertical velocity (y-component). So the velocity at the highest point has only a horizontal or x-component.
When an object At the highest point there's an instant when the motion is changing from upward to downward then what is its velocity?
At that moment, its vertical velocity is zero. Its horizontal velocity may or may not be zero, i.e., it may be moving sideways as well.
How does the graph displacement vs time look for something moving at a constant positive velocity?
An Upward Sloping Straight Line. <3
When object moves upwards what is the velocity and acceleration?
When an object is moving upwards, its velocity is directed upwards. If the object is near the Earth or any other planet, then its acceleration is directed downwards, which also means that its upward velocity is decreasing.
What happens when air moving upward rubs against air moving downward?
stuff
How can tornadoes pick stuff up?
Air in a tornado moves upward pretty rapidly. This upward moving wind often carries objects with it.
How does the graph of displacement vs. time look for something moving at a constant positive velocity?
An Upward Sloping Straight Line. <3
When will objects thrown upward start to go down?
When the vertical component of their velocity has dwindled to zero because of the acceleration of gravity.
What is the vertical velocity of a projectile at the highest point in its trajectory?
The vertical velocity is zero at the highest point. It has ceased moving upward and will begin moving downward. Gravity and air resistance will have negated the original vertical velocity (y-component). So the velocity at the highest point has only a horizontal or x-component.
When an object At the highest point there's an instant when the motion is changing from upward to downward then what is its velocity?
At that moment, its vertical velocity is zero. Its horizontal velocity may or may not be zero, i.e., it may be moving sideways as well.
How does the graph displacement vs time look for something moving at a constant positive velocity?
An Upward Sloping Straight Line. <3
When object moves upwards what is the velocity and acceleration?
When an object is moving upwards, its velocity is directed upwards. If the object is near the Earth or any other planet, then its acceleration is directed downwards, which also means that its upward velocity is decreasing.
Is it possible for an object with constant negative acceleration to change the direction in which it is moving?
Sure. Anything you toss with your hand has constant acceleration after you toss it ... the acceleration of gravity, directed downward. If you toss it upward, it starts out with upward velocity, which reverses and eventually becomes downward velocity.
Is an upward moving object experiencing an upward force?
If the object is moving upwards with a constant velocity, there is only one arrow in the diagram, and it points straight down, due to gravity. If it has a force pulling upward on it, there are two arrows, one up, due to the force, and one down, again, due to gravity.
Why can velocity be negative or positive?
Yes, "velocity" is a vector so it not only has magnitude but also direction. By convention, an object moving from left-to-right or upward is moving in a positive direction while an object moving right-to-left or downward is moving in a negative direction. "Speed" is a related term but it is a scalar. As such, it has only magnitude. A speed cannot be negative.
What is an upward moving current of air?
An upward moving current of air is called an updraft.
