Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 786 · 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.⚖️ 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 change it (c) we keep it the same
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) coins of one kind (c) a 30 cm ruler (d) a flat table
3. 3.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
4. 4.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
5. 5.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a mirror (c) a 30 cm ruler (d) turmeric powder
6. 6.True or false: a spoon lifting a lid uses a pulley. (a) True (b) False
7. 7.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a sloping road (c) a see-saw (d) a crowbar
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 same ruler (b) the number of coins (c) the kind of coins (d) distance from the pencil
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 8 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “distance from the pencil”? (a) we measure it (b) we keep it the same (c) we change it
11. 11.⚙️ Which simple machine is a crane? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a balloon (c) a round pencil (d) coins of one kind
13. 13.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
14. 14.True or false: a slide is an inclined plane. (a) True (b) False
15. 15.True or false: a mirror is needed for the ruler lever. (a) False (b) True
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
17. 17.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) False (b) True
18. 18.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit closer to middle (c) sit farther from middle (d) jump up and down
19. 19.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) zero (d) bigger on the left
20. 20.⚖️ 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) False (b) True
21. 21.True or false: a well pulley uses a pulley. (a) True (b) False
22. 22.⚙️ Which simple machine is a sloping road? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
23. 23.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) turmeric powder (d) coins of one kind
25. 25.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they are too shiny (d) they may swallow them
26. 26.True or false: yeast is needed for the ruler lever. (a) True (b) False
27. 27.⚙️ Which of these is an inclined plane? (a) a crane (b) a slide (c) a crowbar (d) a see-saw
28. 28.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) impossible (d) the same
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
30. 30.⚖️ 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 number of coins
31. 31.True or false: a see-saw is a lever. (a) False (b) True
32. 32.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) a 30 cm ruler (d) a magnet
33. 33.⚙️ Which simple machine is a slide? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
34. 34.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a mirror (c) a round pencil (d) a magnet
35. 35.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a doorknob (c) a ramp (d) a spoon lifting a lid
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 8 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
37. 37.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
38. 38.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the axle (d) the effort
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 8 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
40. 40.⚙️ Which of these uses a pulley? (a) a slide (b) a ramp (c) a well pulley (d) a steering wheel

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