Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 861 · 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.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) flick coins at faces (d) bend it till it snaps
2. 2.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the spoon is hot (c) the spoon is magnetic (d) the lid gets softer
3. 3.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a ramp (c) a tap handle (d) a crane
4. 4.True or false: a flagpole is a lever. (a) False (b) True
5. 5.⚙️ Which simple machine is a doorknob? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
6. 6.⚖️ 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
7. 7.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) the right side (c) neither, it balances (d) the left side
8. 8.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a round pencil (c) yeast (d) a magnet
9. 9.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
10. 10.⚖️ 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 change it (b) we keep it the same (c) we measure it
11. 11.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) a balloon (d) turmeric powder
12. 12.True or false: yeast is not needed for the ruler lever. (a) True (b) False
13. 13.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
14. 14.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
16. 16.True or false: a spoon lifting a lid is a lever. (a) True (b) False
17. 17.⚖️ 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
18. 18.True or false: a crane uses a pulley. (a) False (b) True
19. 19.⚖️ 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) 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 round pencil (c) a mirror (d) a 30 cm ruler
21. 21.⚙️ Which of these is a wheel and axle? (a) a crane (b) a spoon lifting a lid (c) a see-saw (d) a doorknob
22. 22.⚙️ Which simple machine is a tap handle? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
23. 23.⚖️ 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) where the pencil is
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
25. 25.⚙️ Which simple machine is a slide? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
26. 26.⚖️ 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?
27. 27.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a battery cell (c) a magnet (d) a flat table
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
29. 29.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
30. 30.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) always 10 (d) equal on both sides
31. 31.⚖️ 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 keep it the same (c) we measure it
32. 32.⚙️ Which of these is a lever? (a) a doorknob (b) a flagpole (c) a tap handle (d) a bottle opener
33. 33.⚙️ Which simple machine is a see-saw? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
34. 34.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
35. 35.⚖️ 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?
36. 36.True or false: a flat table is needed for the ruler lever. (a) False (b) True
37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the same ruler (b) distance from the pencil (c) which side goes down
38. 38.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
39. 39.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a 30 cm ruler (d) a balloon
40. 40.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed

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