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# Homework Help: Physics, projectile motion problem.

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A force is not required to keep an object in motion. A force is only required to maintain an acceleration. And in the case of a projectile that is moving upward, there is a downward force and a downward acceleration. That is, the object is moving upward and slowing down. To further ponder this concept of the downward force and a downward acceleration for a projectile, consider a cannonball shot horizontally from a very high cliff at a high speed. And suppose for a moment that the gravity switch could be turned off such that the cannonball would travel in the absence of gravity?

What would the motion of such a cannonball be like? How could its motion be described? If not acted upon by an unbalanced force, "an object in motion will Now suppose that the gravity switch is turned on and that the cannonball is projected horizontally from the top of the same cliff. What effect will gravity have upon the motion of the cannonball? Will the cannonball travel a greater or shorter horizontal distance due to the influence of gravity?

The answer to both of these questions is "No! Gravity causes a vertical acceleration. The ball will drop vertically below its otherwise straight-line, inertial path.

Gravity is the downward force upon a projectile that influences its vertical motion and causes the parabolic trajectory that is characteristic of projectiles. A projectile is an object upon which the only force is gravity. Gravity acts to influence the vertical motion of the projectile, thus causing a vertical acceleration.

The horizontal motion of the projectile is the result of the tendency of any object in motion to remain in motion at constant velocity. Due to the absence of horizontal forces, a projectile remains in motion with a constant horizontal velocity. Horizontal forces are not required to keep a projectile moving horizontally. The only force acting upon a projectile is gravity!

Read Watch Interact Physics Tutorial. What Can Teachers Do What is a Projectile? We Would Like to Suggest Could someone help me figure out which formulas are to be used here? Here is the prompt:. Unfortunately, when the crate reaches a point The crate immediately accelerates toward the ground, dragging the hapless crewman across the ice and toward the edge of the cliff.

If we assume the ice is perfectly slick that is, no friction between the crewman and the ice once he slips and falls down , 1 at what speed will the crate hit the ground? Assume also that the rope is long enough to allow the crate to hit the ground before the crewman slides over the side of the cliff. Assume no air friction. All I need to know is which formulas I should use.

I must have forgotten what that stands for. The rest seems to be pretty straightforward. My experience tells me schools repeat the hell out of this mixture of concepts, so perfect them. To be perfectly honest, no. I double checked my calculations about 6 times because I expected the velocity of the crate 5. PM me if you need any concept help. Then again, I have terrible judgment when it comes to speed, distance, and literally anything else.

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## Main Topics

This physics homework example problem shows how to find many common variables in a projectile motion problem, such as range, altitude, time aloft and position at a set time.

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