Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 530 · 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.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) jump up and down (c) sit closer to middle (d) sit farther from middle
2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) harder (d) easier
3. 3.🔮 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 left side (b) the right side (c) both go up (d) neither, it balances
4. 4.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
5. 5.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 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?
7. 7.⚖️ 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 hot (d) the spoon is magnetic
8. 8.⚖️ 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) False (b) True
9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we keep it the same (b) we measure it (c) we change it
10. 10.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a round pencil (c) yeast (d) turmeric powder
11. 11.⚙️ Which of these uses a pulley? (a) a crane (b) a sloping road (c) a bottle opener (d) a slide
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a 30 cm ruler (c) a flat table (d) coins of one kind
13. 13.True or false: a well pulley is a lever. (a) False (b) True
14. 14.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
15. 15.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
16. 16.⚖️ 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
17. 17.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a tap handle (c) a spoon lifting a lid (d) a slide
18. 18.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
19. 19.⚙️ Which of these uses a pulley? (a) a see-saw (b) a flagpole (c) a slide (d) a crowbar
20. 20.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
21. 21.True or false: a ramp is a lever. (a) True (b) False
22. 22.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
23. 23.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
24. 24.⚙️ Which of these is a lever? (a) a ramp (b) a crane (c) a see-saw (d) a flagpole
25. 25.⚙️ Which simple machine is a slide? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
26. 26.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) yeast (c) coins of one kind (d) a 30 cm ruler
27. 27.⚙️ Which simple machine is a ramp? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) the number of coins (c) distance from the pencil (d) the kind of coins
29. 29.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
30. 30.⚖️ 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
31. 31.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
32. 32.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) turmeric powder
34. 34.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) press it gently (d) bend it till it snaps
35. 35.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a battery cell (c) a 30 cm ruler (d) a round pencil
37. 37.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) zero (d) equal on both sides
38. 38.True or false: a crowbar is a lever. (a) False (b) True
39. 39.⚖️ 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) True (b) False
40. 40.True or false: a bottle opener is a lever. (a) False (b) True

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