Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 97 · 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 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?
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 1 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
3. 3.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
4. 4.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
5. 5.True or false: a flat table is needed for the ruler lever. (a) False (b) True
6. 6.⚖️ 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) True (b) False
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a flat table (c) a 30 cm ruler (d) a round pencil
8. 8.⚖️ 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?
9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) True (b) False
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 number of coins (c) distance from the pencil (d) where the pencil is
11. 11.⚖️ What is the turning point of a lever called? (a) the effort (b) the axle (c) the fulcrum (d) the load
12. 12.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is what we measure. (a) True (b) False
13. 13.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a flat table (c) a mirror (d) turmeric powder
14. 14.⚙️ Which simple machine is a slide? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
15. 15.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a slide (c) a flagpole (d) a ramp
16. 16.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) coins of one kind (d) a battery cell
17. 17.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a mirror (c) a 30 cm ruler (d) a round pencil
19. 19.⚖️ 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) True (b) False
20. 20.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit on the middle (d) sit farther from middle
21. 21.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
22. 22.🧺 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 magnet (d) a 30 cm ruler
23. 23.⚖️ 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 change it (b) we keep it the same (c) we measure it
24. 24.True or false: a well pulley uses a pulley. (a) False (b) True
25. 25.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
26. 26.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a magnet (d) a flat table
27. 27.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) turmeric powder (c) coins of one kind (d) a magnet
28. 28.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a round pencil (d) a battery cell
29. 29.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
30. 30.True or false: a slide is a wheel and axle. (a) False (b) True
31. 31.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
32. 32.⚖️ 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 1 cm to the right to balance it?
33. 33.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
34. 34.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
35. 35.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
36. 36.⚙️ Which of these uses a pulley? (a) a crane (b) a tap handle (c) a slide (d) a bottle opener
37. 37.True or false: a ramp is an inclined plane. (a) True (b) False
38. 38.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
39. 39.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
40. 40.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) always 10 (c) zero (d) equal on both sides

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