Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 93 · 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.True or false: yeast is not needed for the ruler lever. (a) True (b) False
2. 2.⚖️ 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
3. 3.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a steering wheel (c) a flagpole (d) a slide
4. 4.⚖️ 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 keep it the same (b) we measure it (c) we change it
5. 5.🛟 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
6. 6.True or false: a mirror is needed for the ruler lever. (a) False (b) True
7. 7.⚙️ Which simple machine is a sloping road? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
8. 8.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit on the middle (c) sit closer to middle (d) sit farther from middle
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
10. 10.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) turmeric powder
11. 11.🔮 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
12. 12.True or false: a spoon lifting a lid is a lever. (a) False (b) True
13. 13.True or false: a ramp is an inclined plane. (a) False (b) True
14. 14.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
15. 15.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
16. 16.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a balloon (d) a magnet
17. 17.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too cold (d) they are too shiny
18. 18.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a bottle opener (c) a slide (d) a tap handle
19. 19.⚙️ Which simple machine is a doorknob? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is what we measure. (a) True (b) False
21. 21.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a round pencil (d) a mirror
22. 22.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
23. 23.⚖️ 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) False (b) True
24. 24.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 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?
26. 26.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
27. 27.⚖️ 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) True (b) False
28. 28.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a 30 cm ruler (c) a battery cell (d) a mirror
29. 29.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a flat table (d) yeast
30. 30.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) a lever boosts your push (c) the lid gets softer (d) the spoon is magnetic
31. 31.True or false: a flat table is needed for the ruler lever. (a) True (b) False
32. 32.True or false: a flagpole uses a pulley. (a) False (b) True
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 10 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
34. 34.⚖️ 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 10 cm to the right to balance it?
35. 35.⚖️ 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 measure it (b) we keep it the same (c) we change it
36. 36.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
37. 37.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) equal on both sides (d) bigger on the left
38. 38.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) turmeric powder (d) a round pencil
39. 39.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
40. 40.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) easier (d) harder

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