Standard 3/Middle School/Benchmark 5
Benchmark Question: How can we control the motions of
Focus Question: How can we use simple machines to
make work seem easier?
Students will work in small
groups to complete the following activities:
Students will pound a large
nail into a piece of wood. The teacher should make sure they leave at least
three cm of the top of the nail above the board. Students will try to
remove the nail with their fingers and then with the claw of a hammer.
Students will discuss the difference in effort needed to remove the nail
with their fingers and with the hammer claw. How and why did the hammer
make the job easier?
Next, students will screw a
screw into a piece of wood. Students will try to unscrew the screw with their
hand and then with a screwdriver. Students will discuss the difference in
effort needed to remove the screw with their fingers and with the
screwdriver. How and why did the screwdriver make the job easier?
Caution: Make sure that all students wear safety
glasses during this activity.