Lever Experiment Worksheet

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

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