Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 316 · 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 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?
2. 2.⚖️ 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) where the pencil is (c) which side goes down
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) turmeric powder (d) a round pencil
4. 4.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a balloon (c) a flat table (d) a round pencil
5. 5.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the spoon is magnetic (c) a lever boosts your push (d) the lid gets softer
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a 30 cm ruler (c) a round pencil (d) coins of one kind
7. 7.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
8. 8.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a bottle opener (c) a spoon lifting a lid (d) a slide
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
10. 10.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
12. 12.⚖️ 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 kind of coins (c) distance from the pencil
13. 13.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a flat table (d) a mirror
15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a magnet (d) a 30 cm ruler
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 round pencil (c) a balloon (d) coins of one kind
18. 18.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) press it gently (d) bend it till it snaps
19. 19.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
20. 20.🔮 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 right side (b) both go up (c) neither, it balances (d) the left side
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) the number of coins (b) which side goes down (c) distance from the pencil (d) the same ruler
22. 22.⚖️ 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
23. 23.True or false: a flat table is needed for the ruler lever. (a) False (b) True
24. 24.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) True (b) False
25. 25.⚖️ 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
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) which side goes down (c) the same ruler (d) the number of coins
27. 27.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) impossible (d) harder
28. 28.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
29. 29.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
30. 30.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
31. 31.⚖️ 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 closer to middle (d) sit farther from middle
32. 32.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) turmeric powder (d) a 30 cm ruler
33. 33.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) equal on both sides (d) always 10
34. 34.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) True (b) False
35. 35.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a doorknob (c) a flagpole (d) a tap handle
36. 36.True or false: a steering wheel is a lever. (a) True (b) False
37. 37.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a balloon (c) turmeric powder (d) a magnet
38. 38.True or false: a flagpole uses a pulley. (a) False (b) True
39. 39.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they may swallow them (d) they are magnetic
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 4 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?

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