Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 144 · 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 1 coin 10 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?
2. 2.⚙️ Which of these uses a pulley? (a) a see-saw (b) a sloping road (c) a spoon lifting a lid (d) a well pulley
3. 3.True or false: a flagpole uses a pulley. (a) False (b) True
4. 4.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
5. 5.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) yeast (c) a magnet (d) a battery cell
6. 6.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) a 30 cm ruler (c) a flat table (d) a round pencil
7. 7.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
8. 8.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) where the pencil is (b) which side goes down (c) distance from the pencil
10. 10.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) bigger on the left (d) equal on both sides
11. 11.True or false: a steering wheel is a wheel and axle. (a) False (b) True
12. 12.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a magnet (c) a 30 cm ruler (d) coins of one kind
14. 14.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a mirror (d) coins of one kind
15. 15.True or false: a steering wheel uses a pulley. (a) False (b) True
16. 16.⚙️ Which simple machine is a ramp? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
17. 17.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
18. 18.⚖️ 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?
19. 19.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too shiny (d) they are too cold
20. 20.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
21. 21.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
22. 22.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a flat table (c) a battery cell (d) a balloon
23. 23.True or false: yeast is not needed for the ruler lever. (a) False (b) True
24. 24.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) press it gently (d) stand on the ruler
25. 25.⚖️ 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) False (b) True
26. 26.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
28. 28.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
29. 29.True or false: a tap handle is a lever. (a) False (b) True
30. 30.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) a lever boosts your push (d) the spoon is magnetic
31. 31.⚖️ 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
32. 32.⚖️ 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) False (b) True
33. 33.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) yeast (c) a balloon (d) a 30 cm ruler
34. 34.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) sit farther from middle (d) jump up and down
35. 35.⚙️ Which of these is a wheel and axle? (a) a bottle opener (b) a see-saw (c) a steering wheel (d) a crane
36. 36.🔮 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 right side (c) the left side (d) both go up
37. 37.⚙️ Which of these is a lever? (a) a flagpole (b) a well pulley (c) a see-saw (d) a steering wheel
38. 38.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a crane (c) a see-saw (d) a slide
39. 39.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
40. 40.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) easier (d) impossible

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