The reason why things bounce, fly, zoom, and splat described by law Physical Motion most kids learn in high school physics classes. But you need not wait until your child hits puberty to have fun with physics – you can start now. Kids all over the world use the law of gravitation everyday to put zing into their games, basketball games Skateboarding. Let’s find out how they do it.
Let’s take a look at the first law of motion. When you put a ball on the floor, it stays put. A science textbook will tell you this: Things at rest tends to remain at rest unless acted with external power. The stand is external force. Kick it!
What about when the ball whacks something? Check back with science textbook: an object in motion tends to stay in motion unless acted with external power. After you kicked the ball (the external force), it flies through the air until it smacks of something.
But there are two other forces acting on the ball you can not see. One force is air resistance. The ball is hitting air molecules when it flies through the air, as it slows down. The gravitational force. Gravity is involved in anything that has mass (including you!), But you need something the size of a planet before you can start to see the impact it has on other things. If you throw the ball in space (from the nearby gravitational pull as black holes or galaxies), it would continue in a straight line forever. There are not any molecules for it to collide with, and no weight of influence to pull it off-course
There is one idea that you need to understand -. Acceleration. A ball at rest has the status you can chart a map (latitude, longitude and altitude), but not the speed or acceleration. It is not moving. When you decide to mix it up and kick the ball, that’s when it gets interesting. Other toe touches the ball, things start to change. The speed of the change in status. If you kick the ball ten feet, it takes five seconds to go the distance, the average speed of the ball is 2 feet per second (1.4 MPH).
The trickier part of this scenario is to do with the acceleration, a change of pace. When driving on the motorway at a constant 65 MPH, acceleration is zero. Speed does not change, so you have no acceleration. Your position is constantly changing, and you have a steady pace. When you get on the freeway, speed changes from zero to 65 MPH in ten seconds. Acceleration is most effective when the foot hits the first gas – when the pace of change most
There is an interesting effect that happens when you travel in an arc .. You can find the effect of different types of acceleration when you turn the car suddenly to the right – you will find Press the left. If you’re going fast enough and you take a turn hard enough, you can get slammed the door. So – who pushed you
Think back to the first law of motion. An object in motion tends to stay in motion unless acted with external power. This is the amazing part – the car is external force. The body was an object in motion, wanting to be moving in a straight line. The car is, your body still tries to maintain direct his way, but the car itself gets in the way. When you slam into the car door, the car is turning up on your way, forcing you to change direction.
This effect is true when you travel in a car or on a roller coaster. That is why the water stays in the bucket when you swing it over your head. Physical activity is everywhere, demanding toddler learning to walk and Olympic downhill skiers to go the distance.
Let’s try these ideas out.
Bucket Splash Fill a bucket half-full with water. Grab the handle and swing it over your head in a circle in a vertical direction. Try spinning around while holding the handle to the front of the chest to swing it horizontally. Vary the speed of rotation to find the least!
Marble Vortex Curling newspaper, bowling, a small hole open at the bottom. Put marble bowling and find the speed you need to circle the cone in order to keep the marble bowling. NOTE: This is a great demonstration satellites. The satellite is marble and cone apex earth. If the marble moves too fast, it will fly out of the cone (equivalent satellite flying out of orbit and into space). If the marble speed is too slow, it will fall to the bottom of the cone (translation: satellite crashes into the ground). It is very specific speed satellite will continue the path.
Ping Pong Curves Attach a clear plastic cup to the end of a long Dowel so that the bottom of the cup rests along the length of Dowel near the end (when the dowel lies flat on the floor, cup pointing up). Put a tennis ball in the cup and grab the free end of the stick hand. Swing it partway through the circle and suddenly stop. The ball should pop out of the cup in line touches the circle at the point where you stopped. Why not ball forward in a circle or be in the cup
Answer: a moving object (the ball) wants to be in motion (straight line) and is free to do it when you leave. Initially, it goes in a straight line touches a circle, but then gravity takes over and down it goes to the floor.
Cork Accelerometer Fill an empty soda bottle to the top with water. Change soda bottle as follows: attach a band of 8-10 “long clean wine cork hot glue free end of the string to the inside of the cap Place cork and string inside the bottle and screw on top .. (trying to avoid air bubbles) . The cork should be free to bob around when you hold the bottle upside down.
To use the accelerometer, invert the bottle and try to make cork move. Remember – it is to measure acceleration, a change of pace. It will only move when the speed changes.
Roller Coaster Physics This is the best way to learn about physics. All you need is a handful of marbles, several pieces of ¾ “foam pipe insulation, a few rolls of masking tape, and the number of participants.
To do roller coasters, you need foam pipe insulation, which is sold six-foot increments at the hardware store. You must slice them in half lengthwise, then each piece makes twelve feet of track. It comes in all sizes, so bring your marbles when you choose size. The ¾ “size fits most marbles, but if you are using ball bearings or shooter marbles, try it out in the store. (At least you’ll get a smile and enthusiasm from the sale of the hardware store people.) On most track lengthwise (The Hard Way) with scissors. You’ll find it’s the slice on one side, so this makes your task easier. Leave a few pieces uncut to become “tunnel” to the second roller coasters.
The next step is to make a song together before adding all the features like loops and curves. Combine two songs together in butt-joint fashion and press a piece of masking tape along the length of both the inside and the lower track. A third piece of tape should go around the entire joint circumferentially. Make this connection as smooth as possible, as high-speed marble roller coaster will tend to fly off the track at the slightest bump.
Roller Coaster Maneuvers Loops Swing song around in a complete circle and hang outside the track chairs, table legs, and hard floors with tape to secure in place.
Loops take a little speed to make it through, so have your partner hold it while you test it out before taping. Start with smaller loops and increase in size to match the speed of entrance into the loop. Loops can be used to slow down marble if speed is a problem.
Camel-Backs Make height off the track in the upside-down U-shaped. Good for the show, especially if you get on the hill height just right so marble comes off the track slightly, then back on without missing a beat.
Whirly-Birds Take the loop and make it horizontal. Great around poles and posts, but just keep turns steep enough and marble speed fast enough so it does not fly off the track.
Corkscrew start with a basic loop, then spread apart entrance and exit points. The farther apart they get, the more fun it will be. Corkscrews usually require a higher speed than the loops of the same size.
Jump off large show-off feature that requires very rigid entrance and exit points on the track. Use a lot of tape and yield entrance (end of the track) slightly while decreasing risk (beginning of a new track pieces).
Pretzel The cream of the crop in the exercises. Make a very loose knot that resembles a pretzel. Bank angle and speed are the most critical, with rigid track position close second. If you’re having trouble, make pretzel memory and try again. You can bank on track every angle because the foam is so soft. Use lots of tape and solid surface (bookcases, chairs, etc).
Troubleshooting Marbles will fly everywhere, so make sure you have a lot of extras! If your marble is not on track, look very good for a starting point -. Since it flies off
oDoes layer change position with a weight of marble, making it fly off course? Make a layer more rigid by pasting it on the surface.
OIS marble jump over the track wall? Extra bank angle (the amount of turning the song makes long).
oDoes marble phone just fall out of the loop? Extra marble speed by starting at a higher position.
oWhen all else fails and marble phone still will not be on the track, making it the tunnel section by pasting another piece to the top of the main track. Spiral-wrap tape along the length of the two pieces to secure them together.