# An analysis on the factors that affect the speed of a ball rolling down a slope

If a ball is running down a ramp, why is it that when you change the height of the ramp, the ball runs down the ramp faster? If you increase the steepness of the ramp, then you will increase the acceleration of a ball which rolls down the ramp. This can be seen in two different ways: Forces are vectors and have a direction and a magnitude.

Introduction Have you ever dropped something and wondered how fast it was moving while falling?

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If it was something fragile, you might not have been thinking about this at the time—you were likely too busy trying to grab the object! We all know that gravity forces an object to fall. But how does this affect how quickly something falls and its impact?

For example, did the object move faster right after leaving your hand, or just before hitting the ground? In this science activity, you will explore the relation between time and distance traveled when a moving object is under gravity's constant acceleration. Background You know from experience that when you ride a bike downhill, it is easy to get going fast.

Gravity is giving you an extra push, so you don't have to do all the work with the pedals. You also know from experience that the longer the hill, the faster you go.

The longer you feel that push from gravity, the faster it makes you go. Finally, you know that the steeper the hill, the faster you go.

The steepest "hill" you could imagine is not much like a hill at all, but rather a sheer vertical drop—where objects go into free fall and where gravity gives the biggest push of all. You wouldn't want to try that on your bicycle! In free fall, gravity constantly accelerates an object increases its velocity —until it hits terminal velocity.

Specifically, gravity increases a falling object's velocity by 9. How does this constant acceleration affect the distance that an object travels over time? In this experiment you will roll a marble down a ramp to find out.

Materials Long cardboard tube, such as an empty roll of wrapping paper, to make your ramp.

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It should be at least two-and-one-half feet long. A thin book or small wood block to raise one end of your ramp. It should be about one-half inch to one inch in thickness.

 Get smart. Sign up for our email newsletter. Friction at the atomic level Determining the forces required to move atoms past each other is a challenge in designing nanomachines. In scientists for the first time were able to move a single atom across a surface, and measure the forces required.

Pair of scissors for cutting the cardboard tube Permanent marker Marble Timer. Make sure it can accurately count individual seconds. Many cell phones have a timer that is this accurate. A ruler optional Preparation Take a long cardboard tube and cut it straight along one of its long sides.

Then cut it along the other side so that you end up with two long pieces that are each semicircles. You will use one of these pieces as the ramp for the marble.

Take one of the semicircle pieces you just cut and raise one end slightly by placing it on a thin book or small block no thicker than one inch—you want a low slope so that the marble does not roll too fast to measure.

Use the permanent marker to mark a starting line across the high end of the ramp, about one-half inch from the end. You ramp is now ready for some marble-rolling action! Procedure Set the timer for one second and then hold a marble in place at the starting line. At the exact same time as you start the timer, release the marble being careful not to give it a push as you let it go.

At the same time, be ready with the marker to note the location of the marble after the second is up. If you have a helper, have them watch the marble for you.

Use the permanent marker to mark where the marble was one second after releasing it. How far did the marble travel? Repeat this process at least nine more times. This means you should end up with at least ten different marks on the ramp, showing where the marble was one second after releasing it each time.On teachers’ salaries, at least, the NCES data is data for WAGES only, not total compensation.

Given their civil service protections, automatic, seniority based promotions, extremely generous benefits and pensions, a picture of flatlining wages is inaccurate. Oct 17,  · I'm a bit confused about the speed of objects rolling down slopes. In my textbook, it says "Neither the mass nor the size of the object will affect its speed when rolling downhill." And that solid balls of different masses/sizes will all reach the bottom of the slope together.