SPEED

Speed is the rate of any action. It is the rate at which an object moves. Speed is measured by calculating the distance moved in a certain amount of time. For example, a box car which moves 5 miles in one hour travels at a speed of 5 miles per hour.

car
Speed is how fast an object is moving. This moving car is a blur as it goes by.

The more force and the lighter the object, the faster the speed of an object. For example, if we push a lighter box car down the ramp, its speed will increase. The less force and the heavier the object, the slower the speed. For example, if we let a heavier box car go down ramp, without pushing it, its speed will slow down. In addition, going uphill will slow speed down. An object going downhill will speed up, go farther and faster.

sprinters
According to Newton's third law of motion, as each runner pushes off, the planet earth and the starting block attached are pushed back-but not enough to measure. At the same time, the runner is pushed forward. The runner and the earth are pushed in opposite directions. Just about all of the motion is concentrated in the runner, sending her off down the track.

boxcar ramp
The speed of the boxcar increased as the driver released the brake and sped down the ramp.

by Bryson, Joshua and Victoria

Gravity
Friction
Bearings
Lubrication
Energy
Speed
Leverage
Center of
Gravity
Field Trip
Photos
Bibliography

Box Car Physics | Kapunahala