Simple Machines Practice Problems
Grades 4-7 · 5 problems
Simple machines are tools that make work easier by changing the magnitude or direction of a force. Practice identifying and calculating the mechanical advantage of these machines.
Tip: Mechanical advantage tells you how much easier a simple machine makes work, but it doesn't change the amount of work that needs to be done.
1
What type of simple machine is a seesaw?
2
A ramp is an example of what simple machine?
3
A pulley system requires 20 N of force to lift a 60 N weight. What is the mechanical advantage of the pulley system?
4
A screw with a pitch of 2 mm is turned one full rotation. How far does the screw advance?
5
A lever is used to lift a rock. The distance from the fulcrum to the point where the force is applied is 3 meters. The distance from the fulcrum to the rock is 1 meter. If the rock weighs 90 N, how much force is needed to lift the rock?
Common Mistakes
- Confusing input and output forces when calculating mechanical advantage.
- Forgetting to use consistent units when calculating mechanical advantage.
- Assuming a simple machine reduces the amount of work needed, rather than just the force required.