Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 261 · 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 simple machine is a well pulley? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 8 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
3. 3.🔮 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) neither, it balances (c) both go up (d) the left side
4. 4.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a magnet (d) a round pencil
5. 5.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
6. 6.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
7. 7.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) harder (d) the same
8. 8.⚖️ 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 kind of coins (b) distance from the pencil (c) the number of coins (d) the same ruler
9. 9.⚖️ 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 keep it the same (b) we measure it (c) we change it
10. 10.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
11. 11.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) press it gently (d) bend it till it snaps
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 3 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) coins of one kind (c) a round pencil (d) a 30 cm ruler
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
15. 15.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a balloon (c) a round pencil (d) a 30 cm ruler
16. 16.⚖️ 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 number of coins
17. 17.⚙️ Which of these is a lever? (a) a crane (b) a ramp (c) a spoon lifting a lid (d) a well pulley
18. 18.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
19. 19.True or false: a well pulley uses a pulley. (a) False (b) True
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) yeast (d) a round pencil
21. 21.True or false: a magnet is needed for the ruler lever. (a) False (b) True
22. 22.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) the number of coins (c) the kind of coins (d) which side goes down
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a balloon (c) coins of one kind (d) a 30 cm ruler
24. 24.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
25. 25.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
26. 26.⚙️ Which of these is an inclined plane? (a) a ramp (b) a well pulley (c) a spoon lifting a lid (d) a tap handle
27. 27.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a steering wheel (c) a ramp (d) a spoon lifting a lid
28. 28.True or false: a steering wheel is a wheel and axle. (a) True (b) False
29. 29.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
30. 30.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
31. 31.True or false: a crowbar is an inclined plane. (a) True (b) False
32. 32.🛟 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
33. 33.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) yeast (c) a balloon (d) a 30 cm ruler
34. 34.⚙️ Which of these is a lever? (a) a well pulley (b) a bottle opener (c) a tap handle (d) a crane
35. 35.⚖️ 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 change it (c) we keep it the same
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
37. 37.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) a round pencil (d) turmeric powder
38. 38.⚙️ Which simple machine is a tap handle? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
39. 39.⚙️ Which of these uses a pulley? (a) a bottle opener (b) a slide (c) a well pulley (d) a crowbar
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “which side goes down”? (a) we keep it the same (b) we change it (c) we measure it

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