Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 208 · 40 questions

What you do (Coins × distance): 1. Balance the ruler on the pencil at its 15 cm mark. 2. Put coins at a measured distance on the left side. 3. Place coins on the right and slide them until the ruler balances. 4. Check: coins × distance on the left = coins × distance on the right; press gently.

1. 1.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the left side (b) both go up (c) neither, it balances (d) the right side
2. 2.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
3. 3.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the kind of coins”? (a) we change it (b) we keep it the same (c) we measure it
4. 4.True or false: yeast is not needed for the ruler lever. (a) False (b) True
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) yeast (c) a 30 cm ruler (d) a flat table
6. 6.True or false: a mirror is needed for the ruler lever. (a) False (b) True
7. 7.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they may swallow them (d) they are magnetic
8. 8.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
9. 9.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) harder (d) impossible
10. 10.⚙️ Which of these is a wheel and axle? (a) a bottle opener (b) a flagpole (c) a crowbar (d) a doorknob
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
12. 12.True or false: a flagpole uses a pulley. (a) False (b) True
13. 13.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a battery cell (c) a round pencil (d) a flat table
15. 15.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) press it gently (d) flick coins at faces
16. 16.True or false: a slide is a wheel and axle. (a) False (b) True
17. 17.True or false: a flagpole is an inclined plane. (a) True (b) False
18. 18.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is the one thing we change? (a) which side goes down (b) distance from the pencil (c) where the pencil is (d) the same ruler
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) distance from the pencil (c) which side goes down (d) the same ruler
20. 20.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
21. 21.True or false: a spoon lifting a lid is a lever. (a) False (b) True
22. 22.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a 30 cm ruler (c) a round pencil (d) a flat table
24. 24.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
26. 26.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
27. 27.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a crane (c) a well pulley (d) a flagpole
28. 28.True or false: a well pulley is an inclined plane. (a) True (b) False
29. 29.True or false: a well pulley uses a pulley. (a) True (b) False
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) coins of one kind (d) a magnet
32. 32.True or false: a ramp is a lever. (a) False (b) True
33. 33.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
34. 34.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) distance from the pencil (c) the same ruler
35. 35.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a spoon lifting a lid (c) a crane (d) a slide
36. 36.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) the spoon is magnetic (d) a lever boosts your push
37. 37.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 3 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
40. 40.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False

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