Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 443 · 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 ramp (b) a crane (c) a doorknob (d) a see-saw
2. 2.⚖️ 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 kind of coins (b) the same ruler (c) distance from the pencil (d) which side goes down
3. 3.⚖️ 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 number of coins (b) distance from the pencil (c) which side goes down
4. 4.⚖️ 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
5. 5.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
6. 6.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
7. 7.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) easier (d) impossible
8. 8.⚖️ 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) False (b) True
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 3 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
10. 10.True or false: a bottle opener is a lever. (a) False (b) True
11. 11.⚖️ 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) distance from the pencil (b) the same ruler (c) where the pencil is (d) the number of coins
12. 12.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit closer to middle (d) sit on the middle
13. 13.⚖️ 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 measure it (b) we keep it the same (c) we change it
14. 14.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) the spoon is hot (d) a lever boosts your push
15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) turmeric powder (d) coins of one kind
16. 16.⚖️ 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 kind of coins (b) which side goes down (c) distance from the pencil
17. 17.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a balloon (c) a round pencil (d) a flat table
18. 18.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
19. 19.⚙️ Which of these uses a pulley? (a) a ramp (b) a see-saw (c) a sloping road (d) a well pulley
20. 20.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a battery cell (d) a round pencil
22. 22.⚖️ 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) False (b) True
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) True (b) False
24. 24.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) a mirror
25. 25.⚙️ Which of these is an inclined plane? (a) a sloping road (b) a tap handle (c) a flagpole (d) a spoon lifting a lid
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 2 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 mirror (b) a magnet (c) a flat table (d) a balloon
28. 28.🛟 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
29. 29.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
30. 30.⚙️ Which of these is an inclined plane? (a) a slide (b) a crane (c) a bottle opener (d) a flagpole
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
33. 33.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
34. 34.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a well pulley (c) a crane (d) a doorknob
35. 35.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a round pencil (d) a mirror
36. 36.🧺 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 mirror
37. 37.🔮 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 right side (b) the left side (c) both go up (d) neither, it balances
38. 38.⚖️ What is the turning point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
39. 39.True or false: a balloon is needed for the ruler lever. (a) True (b) False
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False

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