TEKS & Objectives
7.7. Force, motion, and energy. The student knows that there is a relationship between force, motion, and energy. The student is expected to:
7.3.A analyze, evaluate, and critique scientific explanations by using empirical evidence, logical reasoning, and experimental and observational testing, so as to encourage critical thinking by the student
We will explore six different types of simple machines.
I will identify common, household simple machines.
1. Watch video.
2. Identify simple machines found in your home.
Inclined Plane A simple machine that has a gently sloped surface so it can be used to move objects upwards with less force. Ramps are examples of inclined planes.
Screw An inclined plane wrapped around a center rod. A surprising example of a screw is a spiral staircase.
Wedge A simple machine that gets thinner at one end that is used to split material such as wood. A knife is an example of a wedge.
Lever A plank that rests on something underneath and moves up and down. Scissors and tongs are levers.
Pulley A wheel and rope that can change the direction of a force. A flagpole uses a pulley to raise the flag.
Wheel and Axle simple machine used to move objects across a distance using a round part (wheel) and a long part (axle). Cars have wheels and axles.
3. Engineer and construct a pulley system.
2 Options:
[Short video excerpt screen recorded]
Or, Make one from cans, string and cardboard.
- Remember, you can try different paths for your string through the cans.
- Compare different configurations.
- Does using more cans make the weight easier to lift or harder?
- Click the picture below for detailed instructions:
Alternately…
Try engineering a toy marble run from parts.
3. Make the catapult seen in the video.
DIY video segment from GG Simple Machines
Alternate Activities
Engineer and construct a pulley system.
[Screen recorded section here]
Find the simple machines that make up roller coasters.
Click here to read about the many simple machines found in roller coasters.
Look up some YouTube videos about roller coasters and see how many simple machines you can spot.
Try to use an inclined plane to create enough speed to complete a roller coaster loop:
Speaking of today’s project…
4. “What Kind of Simple Machine is This?”
