Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 947 · 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.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) always 10 (c) equal on both sides (d) zero
2. 2.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a round pencil (c) a 30 cm ruler (d) coins of one kind
4. 4.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
5. 5.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
6. 6.🧺 Do we need a balloon 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? Which of these is kept the same? (a) which side goes down (b) the number of coins (c) distance from the pencil
8. 8.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) coins of one kind (c) a flat table (d) a round pencil
10. 10.⚖️ 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) the same ruler (b) the kind of coins (c) distance from the pencil (d) where the pencil is
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
12. 12.True or false: a bottle opener is a wheel and axle. (a) False (b) True
13. 13.⚖️ 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
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) True (b) False
15. 15.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a flat table (c) turmeric powder (d) a magnet
16. 16.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) a magnet
17. 17.⚙️ Which simple machine is a slide? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
18. 18.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) flick coins at faces (d) press it gently
19. 19.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a balloon (d) a flat table
20. 20.True or false: a crowbar is a lever. (a) False (b) True
21. 21.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
22. 22.True or false: a flagpole is a wheel and axle. (a) True (b) False
23. 23.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) a lever boosts your push (c) the lid gets softer (d) the spoon is hot
24. 24.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a balloon (c) coins of one kind (d) a mirror
25. 25.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a magnet (c) coins of one kind (d) a flat table
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 12 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?
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
28. 28.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
29. 29.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) True (b) False
31. 31.True or false: yeast is not needed for the ruler lever. (a) False (b) True
32. 32.⚖️ 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
33. 33.⚙️ Which of these is a lever? (a) a tap handle (b) a ramp (c) a crowbar (d) a doorknob
34. 34.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) easier (d) impossible
35. 35.⚙️ Which simple machine is a crowbar? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
36. 36.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a round pencil (c) yeast (d) a balloon
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
38. 38.True or false: a crane is a wheel and axle. (a) False (b) True
39. 39.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a tap handle (c) a ramp (d) a crane
40. 40.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed

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