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Tuesday, 2 May 2017

Bouncing ball

Aim:
I want to find out if there is a relationship between how high a ball is dropped from and how high it bounces up.

Hypothesis:
I predict that the higher the ball is dropped from, the higher it bounces.

Method:
The equipment that I will need is:
  • Bouncy ball
  • Ruler
  • Stand with boss head and clamp


Height of drop
Height of bounce on carpet
Height of bounce on concrete
80cm
 10cm 39cm
90cm
 21cm 36cm
100cm
 31cm 43cm

Findings:
The ball bounces higher in concrete than in the carpet.





  1. Attach the clamp to the stand.
  2. Clamp the ruler onto the stand so that the zero mark is on the ground.
  3. Hold the bottom of the ball on 50cm and drop.
  4. Record the height of the bounce measuring the bottom of the ball.
  5. Repeat the experiment twice more and record the average measurement.
  6. Repeat the whole experiment using heights of 60cm, 70cm, 80cm, 90cm, 100cm
                                      
Variables:

Independent (changing) Variable = The height of the drop
Dependent (measured) Variable = The height of the bounce

    Results:






    Conclusion: It bounces higher from 90cm to bounce to 36cm in the concrete.
    It bounces lower from 90cm to bounce to 21cm in the carpet.



    Top ten fastest in the word




    Helios Probe

    Fastest in Space – Unmanned
     
    Fastest in Space – Unmanned Top Speed: 153,800 mph To escape Earth's gravitational pull, an object must be traveling around 25,000 mph. Accordingly, planetary probes are the fastest objects humankind has engineered. In 1976, the Helios 2 orbiter became the fastest manmade object, traveling twice the speed of Earth's orbit around the sun. The orbiter's speed was caused not by its own thrust but by an eccentric orbit caused by the mass of the sun. In its closest approach, the orbiter was 26 million miles away from the star–10 million miles closer than the planet Mercury. At its top speed, the Helios 2 was traveling 42.7 miles every second.





    NASA X-43


    Fastest in the Air Top Speed: 7000 mph This experimental jet-powered aircraft can fly at almost 10 times the speed of sound. After being transported to 100,000 feet by a rocket booster, the X43 detaches and its scramjet engine is ignited. Unlike a rocket, which is powered by fuel that requires a bulky oxidizer, a scramjet obtains its thrust by mixing fuel with supersonic air. Just 10 seconds of thrust from the engine accelerates the unmanned plane to Mach 9.2, or two miles per second. NASA hopes this technology can one day make travel to low Earth orbit more affordable.






    Rocket Sled


    Fastest on The Ground – Unmanned Top Speed: 6416 mph In 2003, this rocket-powered sled became the fastest vehicle on land, accelerating to Mach 8.5 over the course of a 3-mile track. The sled was propelled by a four-stage rocket and for the first 11,000 feet the track was enclosed in a tube filled with helium, which reduced friction. The sled's acceleration maxed out at 157 g's–52 times greater than the g-forces experienced during a space shuttle launch. The speed was impressive, but breaking a record was not the Air Force's primary goal. Instead, the test was devised as a simulation of a warhead intercepting an enemy missile.


    ThrustSSC

    Fastest on The Ground – Manned Top Speed: 771 Mph During a run in the Black Rock Desert in 1997, this jet car became the first automobile to break through the sound barrier. Two Rolls Royce Spey jet engines powered the 10-ton vehicle and produced 50,000 pounds of thrust and 110,000 hp–91 times more horsepower than the fastest street-legal car. It accelerated from 0 to 600 in 16 seconds and subjected its driver to 3 g's. Most wheels would explode under these conditions, so engineers custom designed aluminum-alloy wheels that were tested to spin at 9500 rpm. Currently, a new car, the Bloodhound SSC, is being created with the goal of breaking the land speed record. It is designed to accelerate to 1000 mph.



    Spirit of Australia


    Fastest in The Water Top Speed: 317.6 mph Setting speed records in the water is an extremely dangerous endeavor–a simple wake or swell can result in tragedy. Ken Darby set the record in 1978 with this 6000-hp homebuilt watercraft; since then, many people have died in attempts to break it. However, the danger has not stopped Darby from pushing to break his own record–he is currently working on a new 9000-hp craft.


    SR-71 Black Bird


    Fastest in the Air Top Speed: 2200-plus mph Now discontinued, the SR-71 Blackbird could cruise at Mach 3 for over 3000 miles. "It was the pre-eminent reconnaissance aircraft for decades," says Bob Van der Linden, chairman of aeronautics at the National Air and Space Museum. But the planes became too costly to maintain, and new technologies have made aerial reconnaissance easier. Today, the military relies more on satellite imaging for reconnaissance, but satellites have their drawbacks. "Satellites have a set course, they fly over certain times of day, and sometimes the bad guys know that; they won't move anything when they know a satellite is overhead," Van der Linden says. "The SR-71 can pop up at any time, especially in trouble areas." When it flew, the Blackbird could traverse North America in about an hour and a half.




    Galileo Probe

    Fastest in Space – Unmanned Top Speed: 107,000 mph In 2003, the Galileo mission to study Jupiter and its moons had already been extended several years and the space probe was running out of propellant. Probes to distant planets use nuclear thermal generators, which keep them operational for decades, but eventually wear out, says Roger Launius, an expert on U.S. spaceflight. "Those are good for 30, 40 maybe 50 years, but they have a half-life," he says. "Over the course of a lengthy mission, you find you have less and less power to supply whatever systems are onboard." Instead of risking a crash into Europa, Jupiter's ice-covered moon, the Galileo probe took a controlled dive into the gas giant. Jupiter has a gravitational pull that is 2.5 times the gravitational pull of Earth, and as Galileo entered its atmosphere, it accelerated to a speed of 107,000 mph. At that speed, a trip from the Earth to the Moon would take 2.2 hours.



    Koenigsegg Agera R



    Image result for Top ten fastest vehicle in the world and the reason
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