Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 174 · 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.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) stand on the ruler (d) press it gently
2. 2.⚙️ Which of these is a lever? (a) a sloping road (b) a crowbar (c) a well pulley (d) a slide
3. 3.⚖️ 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 keep it the same (b) we change it (c) we measure it
4. 4.⚖️ 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 keep it the same (c) we measure it
5. 5.⚙️ Which simple machine is a flagpole? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
6. 6.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
7. 7.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
8. 8.🛟 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
9. 9.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) coins of one kind (c) a flat table (d) a round pencil
11. 11.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) which side goes down (c) the same ruler
12. 12.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
14. 14.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) easier (d) the same
15. 15.⚙️ Which simple machine is a sloping road? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
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 number of coins (b) which side goes down (c) distance from the pencil
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
18. 18.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
19. 19.⚖️ 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) False (b) True
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 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?
21. 21.⚖️ 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 measure it (b) we keep it the same (c) we change it
22. 22.⚙️ Which of these uses a pulley? (a) a tap handle (b) a spoon lifting a lid (c) a doorknob (d) a crane
23. 23.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
24. 24.⚖️ 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
25. 25.True or false: a flagpole uses a pulley. (a) False (b) True
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 3 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.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
28. 28.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
29. 29.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
30. 30.True or false: a crane is a lever. (a) True (b) False
31. 31.⚖️ 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) the kind of coins (b) distance from the pencil (c) the number of coins (d) where the pencil is
32. 32.⚖️ 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) where the pencil is (c) the number of coins (d) the same ruler
33. 33.⚖️ What is the turning point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
34. 34.True or false: a slide is a wheel and axle. (a) False (b) True
35. 35.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) a round pencil (c) a 30 cm ruler (d) coins of one kind
36. 36.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a 30 cm ruler (d) a battery cell
38. 38.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) always 10 (d) equal on both sides
39. 39.⚙️ Which of these is a lever? (a) a well pulley (b) a steering wheel (c) a crane (d) a bottle opener
40. 40.True or false: a flagpole is a lever. (a) True (b) False

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