Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 318 · 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.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
2. 2.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are too shiny (d) they are magnetic
3. 3.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a slide (c) a well pulley (d) a crowbar
4. 4.True or false: a bottle opener is a lever. (a) True (b) False
5. 5.True or false: yeast is not needed for the ruler lever. (a) False (b) True
6. 6.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
7. 7.⚖️ 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) False (b) True
8. 8.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) turmeric powder (d) a 30 cm ruler
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
10. 10.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
11. 11.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) flick coins at faces (d) stand on the ruler
12. 12.⚖️ 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) False (b) True
13. 13.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
14. 14.⚖️ 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 change it (c) we keep it the same
15. 15.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
16. 16.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a well pulley (c) a crane (d) a sloping road
17. 17.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit farther from middle (c) sit closer to middle (d) sit on the middle
18. 18.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) True (b) False
19. 19.True or false: a balloon is needed for the ruler lever. (a) True (b) False
20. 20.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
21. 21.⚖️ 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) where the pencil is (b) the number of coins (c) distance from the pencil (d) the same ruler
22. 22.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a slide (c) a tap handle (d) a bottle opener
23. 23.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) always 10 (d) bigger on the left
24. 24.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
25. 25.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the kind of coins (b) distance from the pencil (c) which side goes down (d) the number of coins
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
27. 27.⚙️ Which of these uses a pulley? (a) a doorknob (b) a flagpole (c) a tap handle (d) a slide
28. 28.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
30. 30.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
31. 31.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) a lever boosts your push (c) the lid gets softer (d) the spoon is magnetic
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 5 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?
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
34. 34.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a flat table (c) a round pencil (d) coins of one kind
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 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?
37. 37.True or false: a steering wheel is a wheel and axle. (a) True (b) False
38. 38.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
39. 39.True or false: a spoon lifting a lid uses a pulley. (a) True (b) False
40. 40.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed

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