Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 498 · 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.⚙️ Which of these uses a pulley? (a) a crowbar (b) a flagpole (c) a bottle opener (d) a sloping road
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a magnet (c) a round pencil (d) coins of one kind
3. 3.True or false: a well pulley is a lever. (a) False (b) True
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
5. 5.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
6. 6.⚙️ Which of these uses a pulley? (a) a sloping road (b) a slide (c) a bottle opener (d) a crane
7. 7.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) yeast (c) a 30 cm ruler (d) a magnet
8. 8.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) jump up and down (c) sit farther from middle (d) sit closer to middle
9. 9.🔮 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) the right side (d) neither, it balances
10. 10.⚙️ Which simple machine is a well pulley? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
11. 11.⚖️ 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 kind of coins
12. 12.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) zero (d) always 10
13. 13.🧺 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
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the number of coins”? (a) we measure it (b) we keep it the same (c) we change it
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
16. 16.True or false: a see-saw is a lever. (a) False (b) True
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) turmeric powder (d) coins of one kind
18. 18.True or false: a doorknob is an inclined plane. (a) False (b) True
19. 19.⚙️ Which of these is a lever? (a) a ramp (b) a bottle opener (c) a well pulley (d) a crane
20. 20.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a flat table (c) a 30 cm ruler (d) coins of one kind
21. 21.True or false: a magnet is needed for the ruler lever. (a) True (b) False
22. 22.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 5 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) yeast (d) a 30 cm ruler
25. 25.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
26. 26.⚙️ Which of these is a lever? (a) a crowbar (b) a sloping road (c) a slide (d) a crane
27. 27.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
28. 28.⚙️ Which of these uses a pulley? (a) a slide (b) a well pulley (c) a see-saw (d) a spoon lifting a lid
29. 29.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a crane (c) a slide (d) a spoon lifting a lid
30. 30.⚙️ Which of these is a lever? (a) a see-saw (b) a flagpole (c) a steering wheel (d) a well pulley
31. 31.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
32. 32.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
34. 34.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
35. 35.True or false: a bottle opener is a lever. (a) False (b) True
36. 36.True or false: a ramp uses a pulley. (a) True (b) False
37. 37.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
38. 38.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) the spoon is hot (d) a lever boosts your push
39. 39.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) coins of one kind (d) a round pencil
40. 40.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) a flat table (d) coins of one kind

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