Download Ace Your Forces and Motion Science Project by Robert Gardner PDF

By Robert Gardner

What is friction? what's the coriolis strength? younger scientists will discover the physics of forces and movement with the nice experiments during this publication. Full-color illustrations spotlight key issues to make technology a snap! Many experiments are via principles for technology reasonable tasks. support scholars ace their subsequent physics undertaking or try!

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Is it straight? How can you account for its shape? If someone is convinced that water always spirals clockwise down a drain in the Northern Hemisphere, partially fill a sink or bathtub with water. Use your hand to give the water a counterclockwise rotation a few minutes before you invite that person to watch the water empty down the drain. Even though the water will appear to be still, there will be enough residual rotation to make the water spiral counterclockwise down the drain. If someone else is convinced that water always spirals counterclockwise, you can demonstrate clockwise rotation by using the same technique.

Place a sturdy sheet of paper on a smooth floor. Place a bowling ball or any other heavy ball on top of the paper. Firmly grab the two corners of the paper nearest to you. Very rapidly, pull the paper horizontally toward you (see Figure 2). What happens to the bowling ball? The bowling ball either does not move at all or stirs slightly. The force (pull) acts on the paper but not on the ball. According to Newton’s first law, an object stays in place unless a force acts upon it. Since no force acted to move the bowling ball, it stayed in place.

How can this be? The explanation lies in the variable, acceleration. Acceleration measures the change in velocity that takes place over a certain time. For example, for an object moving in a straight line, the acceleration might be the change in speed in miles per hour that takes place each second. Suppose that the ball was started by a slap that left it going one mile per hour (one mph). You slap it at the end of one more second to go 2 mph. The acceleration is the difference in speed divided by the time that it takes, so the acceleration is Each second that you speed up the ball, you make it go one mph faster than before, so that at the end of 5 seconds, for example, the ball is moving at 5 mph.

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