Year 7 Science · Unit 3 · Lesson 17
Foundation Worksheet
Learning Goals
Fill the gap
Choose the correct word from the word bank to complete each sentence. Two words will not be used.
A simple machine like a is a rigid bar that rotates around a fixed pivot point called the . The weight you are trying to move is called the , and the force you apply to move it is called the . A uses a grooved wheel and rope to change the direction or size of a force. When a machine allows you to move a heavy load with less force than the load itself, the machine has a greater than 1.
True or False? Fix the false ones
Circle T or F for each statement. If the statement is false, rewrite it correctly on the line below.
A lever creates extra energy — that's why it makes lifting easier.
Correct it:
In a class 2 lever, the fulcrum is between the effort and the load.
Correct it:
A fixed pulley attached to a ceiling beam always reduces the effort force you need to apply.
Correct it:
A seesaw is an example of a class 1 lever because the fulcrum is between the effort and the load.
Correct it:
Tweezers are a class 3 lever because the effort is between the fulcrum and the load.
Correct it:
1. A wheelbarrow is a class 2 lever. Identify the positions of the fulcrum, load, and effort on a wheelbarrow.
2. A construction crane in Sydney CBD uses a movable pulley to lift heavy steel beams. Explain one advantage of using a movable pulley rather than a fixed pulley for this task.
Wrap Up
In one sentence, what was the main idea of this lesson?