Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 819 · 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.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too shiny (d) they are too cold
2. 2.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a 30 cm ruler (c) a battery cell (d) a magnet
3. 3.⚖️ 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) distance from the pencil (b) the number of coins (c) the same ruler (d) where the pencil is
4. 4.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a mirror (d) a flat table
5. 5.True or false: a flagpole is a lever. (a) False (b) True
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
7. 7.True or false: a flagpole is a wheel and axle. (a) False (b) True
8. 8.⚙️ Which of these uses a pulley? (a) a see-saw (b) a steering wheel (c) a flagpole (d) a slide
9. 9.⚖️ 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
10. 10.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
11. 11.True or false: a slide is an inclined plane. (a) True (b) False
12. 12.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the number of coins (b) distance from the pencil (c) which side goes down
14. 14.🔮 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) the right side (c) both go up (d) neither, it balances
15. 15.⚖️ 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
16. 16.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
17. 17.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
18. 18.True or false: a magnet is needed for the ruler lever. (a) False (b) True
19. 19.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a flat table (d) a balloon
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a mirror (d) a 30 cm ruler
22. 22.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) press it gently (d) flick coins at faces
23. 23.⚖️ 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
24. 24.⚙️ Which of these uses a pulley? (a) a crane (b) a slide (c) a ramp (d) a crowbar
25. 25.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
26. 26.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit closer to middle (c) sit farther from middle (d) sit on the middle
27. 27.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) easier (d) the same
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we measure it (b) we keep it the same (c) we change it
30. 30.⚙️ Which of these is a lever? (a) a slide (b) a steering wheel (c) a flagpole (d) a bottle opener
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) yeast (c) a round pencil (d) a 30 cm ruler
32. 32.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) True (b) False
33. 33.True or false: a flagpole is an inclined plane. (a) False (b) True
34. 34.⚙️ Which simple machine is a bottle opener? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) which side goes down (c) the same ruler
36. 36.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “distance from the pencil”? (a) we measure it (b) we keep it the same (c) we change it
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
38. 38.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
39. 39.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a spoon lifting a lid (c) a slide (d) a steering wheel
40. 40.True or false: a see-saw is a lever. (a) False (b) True

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