Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Roseann Feldmann"'
Autor:
Roseann Feldmann, Sally M. Walker
What do flagpoles and some window blinds have in common? They use pulleys to perform work! Pulleys are simple machines. They help us to do jobs more easily. But don't take our word for it. Put pulleys to the test with the fun experiments you'll find
Autor:
Roseann Feldmann, Sally M. Walker
What do bicycles, doorknobs, and screwdrivers have in common? All of them use wheels and axles to perform work! Wheels and axles are simple machines. They help us to do jobs more easily. But don't take our word for it. Put wheels and axles to the tes
Autor:
Roseann Feldmann, Sally M. Walker
What do staircases, dump truck beds, and ramps have in common? All of them are inclined planes! Inclined planes are simple machines. They help us to do jobs more easily. But don't take our word for it. Put inclined planes to the test with the fun exp
Autor:
Roseann Feldmann, Sally M. Walker
What do a doorstop, a butter knife, and the front of a boat have in common? All of them are wedges! Wedges are simple machines. They help us to do jobs more easily. But don't take our word for it. Put wedges to the test with the fun experiments you'l
Autor:
Roseann Feldmann, Sally M. Walker
What do hammers, wheelbarrows, and brooms have in common? All of them are levers! Levers are simple machines. They help us to do jobs more easily. But don't take our word for it. Put levers to the test with the fun experiments you'll find in this boo
Autor:
Roseann Feldmann, Sally M. Walker
What do jar tops and water-bottle lids have in common? Both of them are screws! Screws are simple machines. They help us to do jobs more easily. But don't take our word for it. Put screws to the test with the fun experiments you'll find in this book.
Autor:
Roseann Feldmann, Sally M. Walker
What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these fundamental concepts, discover how you work, and how simple machines
Autor:
Roseann Feldmann, Sally M. Walker
Of the six simple machines, the wheel and axle is probably the most recognized. But how does it help you work? Simple and fun experiments illustrate the basic concepts explained in the text to show you just how easy work can be.
Autor:
Roseann Feldmann, Sally M. Walker
What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these fundamental concepts, discover how you work, and how simple machines
Autor:
Roseann Feldmann, Sally M. Walker
We've all seen screws, but how do they work? Why is it easier to screw something into something than to simply push it in? With basic hands-on experiments and clear descriptions, this simple machine is explained.