Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 888 · 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.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) a balloon
2. 2.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they may swallow them (d) they are too shiny
3. 3.⚙️ Which simple machine is a doorknob? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
4. 4.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) True (b) False
6. 6.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a battery cell (c) a 30 cm ruler (d) turmeric powder
7. 7.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) impossible (d) the same
8. 8.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a crane (c) a flagpole (d) a see-saw
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
10. 10.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a flat table (c) coins of one kind (d) a round pencil
12. 12.⚖️ 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
13. 13.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
14. 14.🔮 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) neither, it balances (c) the right side (d) the left side
15. 15.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) bigger on the left (d) zero
16. 16.⚙️ Which simple machine is a ramp? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
17. 17.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a crowbar (c) a ramp (d) a steering wheel
18. 18.⚖️ 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 change it (b) we measure it (c) we keep it the same
19. 19.True or false: a steering wheel is a wheel and axle. (a) True (b) False
20. 20.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit on the middle (d) sit farther from middle
21. 21.⚙️ Which of these uses a pulley? (a) a doorknob (b) a well pulley (c) a bottle opener (d) a tap handle
22. 22.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) yeast (c) a 30 cm ruler (d) a round pencil
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
24. 24.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
26. 26.⚖️ 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) a lever boosts your push (d) the spoon is hot
27. 27.⚙️ Which of these is a lever? (a) a sloping road (b) a ramp (c) a crowbar (d) a doorknob
28. 28.⚖️ 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
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 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?
30. 30.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) flick coins at faces (d) press it gently
31. 31.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a balloon (c) a round pencil (d) yeast
32. 32.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a flat table (d) turmeric powder
33. 33.⚙️ Which of these uses a pulley? (a) a ramp (b) a sloping road (c) a slide (d) a crane
34. 34.🧺 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) a mirror
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) True (b) False
36. 36.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a battery cell (c) a round pencil (d) coins of one kind
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 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?
38. 38.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
39. 39.⚖️ 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
40. 40.⚖️ 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 number of coins (c) the kind of coins (d) which side goes down

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