Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 570 · 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 uses a pulley? (a) a tap handle (b) a well pulley (c) a slide (d) a steering wheel
2. 2.⚙️ Which simple machine is a ramp? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a battery cell (c) a 30 cm ruler (d) coins of one kind
4. 4.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
5. 5.⚖️ 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?
6. 6.True or false: a crane uses a pulley. (a) False (b) True
7. 7.True or false: a sloping road uses a pulley. (a) True (b) False
8. 8.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) always 10 (d) equal on both sides
9. 9.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 3 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
11. 11.⚖️ 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 change it (b) we keep it the same (c) we measure it
12. 12.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too cold (d) they are too shiny
13. 13.⚖️ 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
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the number of coins (b) the kind of coins (c) which side goes down (d) distance from the pencil
15. 15.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
16. 16.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a steering wheel (c) a see-saw (d) a ramp
17. 17.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a magnet (c) a flat table (d) a round pencil
18. 18.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
19. 19.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the axle (d) the effort
20. 20.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) the same (d) easier
21. 21.⚖️ 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
22. 22.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a flat table (d) a magnet
23. 23.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
24. 24.⚙️ Which of these is an inclined plane? (a) a tap handle (b) a well pulley (c) a see-saw (d) a sloping road
25. 25.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we change it (b) we measure it (c) we keep it the same
27. 27.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the lid gets softer (c) the spoon is magnetic (d) the spoon is hot
28. 28.⚖️ 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) where the pencil is (b) the number of coins (c) the same ruler (d) distance from the pencil
29. 29.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the left side (c) the right side (d) both go up
30. 30.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) yeast (c) coins of one kind (d) a round pencil
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
32. 32.True or false: a ramp is an inclined plane. (a) False (b) True
33. 33.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a see-saw (c) a well pulley (d) a crowbar
34. 34.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a round pencil (c) a flat table (d) a 30 cm ruler
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 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?
37. 37.True or false: a mirror is needed for the ruler lever. (a) False (b) True
38. 38.⚖️ 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) the same ruler (c) which side goes down
39. 39.⚖️ 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) True (b) False
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 12 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?

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