Simple Machines — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
A seesaw is an example of a pulley.
Corrected: A seesaw is an example of a lever.
The corrected sentence is: "A seesaw is an example of a lever.". The original sentence "A seesaw is an example of a pulley." contained an error that needed to be fixed.
2. Fix the sentence:
A ramp is a type of wedge that helps move heavy objects up.
Corrected: A ramp is a type of inclined plane that helps move heavy objects up.
The corrected sentence is: "A ramp is a type of inclined plane that helps move heavy objects up.". The original sentence "A ramp is a type of wedge that helps move heavy objects up." contained an error that needed to be fixed.
3. Fix the sentence:
A doorknob is an example of a screw.
Corrected: A doorknob is an example of a wheel and axle.
The corrected sentence is: "A doorknob is an example of a wheel and axle.". The original sentence "A doorknob is an example of a screw." contained an error that needed to be fixed.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A simple machine makes work easier by changing the amount of force needed.
Simple machines help by changing the size or direction of a force, making tasks easier to perform.
2. There are six types of simple machines.
The six types of simple machines are lever, inclined plane, wedge, screw, pulley, and wheel and axle.
3. A lever is a bar that turns on a fixed point called a fulcrum.
The fulcrum is the fixed point where a lever rests and pivots to lift or move a load.
4. A pulley is a simple machine that uses a rope and a wheel to lift heavy loads.
A pulley is a simple machine that uses a rope wrapped around a wheel to help lift heavy objects.
Part C: True or False?
Read each statement. Circle True or False.
1. A lever helps lift heavy objects by using a fulcrum.
True False
The statement is true based on simple machines concepts.
2. An inclined plane makes it harder to move objects to a higher place.
True False
The statement is false; check the simple machines concept carefully.
3. A screw is a type of inclined plane wrapped around a rod.
True False
The statement is true based on simple machines concepts.