Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 727 · 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 is a wheel and axle? (a) a ramp (b) a tap handle (c) a spoon lifting a lid (d) a see-saw
2. 2.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a mirror (c) coins of one kind (d) a balloon
3. 3.True or false: a crane is an inclined plane. (a) True (b) False
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a flat table (d) turmeric powder
6. 6.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too shiny (c) they are too cold (d) they are magnetic
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 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?
8. 8.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
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 right side (b) both go up (c) the left side (d) neither, it balances
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
11. 11.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a flat table (c) coins of one kind (d) a 30 cm ruler
12. 12.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the kind of coins”? (a) we measure it (b) we keep it the same (c) we change it
15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a battery cell (d) a 30 cm ruler
16. 16.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
17. 17.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) always 10 (d) equal on both sides
18. 18.⚖️ 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) False (b) True
19. 19.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
20. 20.⚖️ 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 same ruler
21. 21.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
22. 22.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) bend it till it snaps (d) stand on the ruler
23. 23.True or false: a ramp uses a pulley. (a) True (b) False
24. 24.⚙️ Which of these uses a pulley? (a) a see-saw (b) a doorknob (c) a well pulley (d) a tap handle
25. 25.True or false: a bottle opener is a lever. (a) True (b) False
26. 26.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
27. 27.True or false: a spoon lifting a lid is a lever. (a) True (b) False
28. 28.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) True (b) False
30. 30.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a 30 cm ruler (c) yeast (d) a mirror
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) a 30 cm ruler (c) a flat table (d) a round pencil
32. 32.True or false: a flagpole is a lever. (a) False (b) True
33. 33.⚖️ 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 kind of coins
34. 34.⚙️ Which simple machine is a crane? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
35. 35.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) turmeric powder (c) a flat table (d) coins of one kind
36. 36.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
37. 37.⚙️ Which simple machine is a slide? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
38. 38.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) a flat table (d) a round pencil
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
40. 40.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed

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