Here’s  an idea…
Simple machines are everywhere, yet we often use them without even realizing they are machines. For example, a fork is a wedge and a doorknob is a wheel and axle! How many simple machines can your students  find in your classroom?  In what way does each simple machine help move something or make work easier?  Have your students find levers, wheels and axles, wedges, pulleys, screws, and inclined planes in their every day environment.