Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 672 · 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 is not needed for the ruler lever? (a) coins of one kind (b) yeast (c) a flat table (d) a 30 cm ruler
2. 2.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
3. 3.⚖️ 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) where the pencil is (b) the number of coins (c) distance from the pencil (d) which side goes down
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 12 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “distance from the pencil”? (a) we measure it (b) we keep it the same (c) we change it
7. 7.⚙️ Which of these is an inclined plane? (a) a crane (b) a doorknob (c) a bottle opener (d) a slide
8. 8.⚖️ 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) the number of coins (c) the same ruler (d) distance from the pencil
9. 9.⚖️ 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) True (b) False
10. 10.🧺 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 round pencil (d) a battery cell
11. 11.⚖️ 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) True (b) False
12. 12.True or false: a flagpole is a wheel and axle. (a) True (b) False
13. 13.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
14. 14.⚖️ 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
15. 15.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they may swallow them (d) they are too shiny
16. 16.🔮 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) the right side (c) neither, it balances (d) the left side
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a flat table (c) a round pencil (d) coins of one kind
18. 18.⚙️ Which simple machine is a bottle opener? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
19. 19.⚙️ Which simple machine is a flagpole? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
20. 20.⚖️ 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 measure it (c) we change it
21. 21.True or false: a flat table is needed for the ruler lever. (a) False (b) True
22. 22.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) press it gently (d) flick coins at faces
23. 23.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
24. 24.True or false: a well pulley is a lever. (a) True (b) False
25. 25.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
26. 26.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
27. 27.⚖️ 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?
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.⚖️ 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
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
31. 31.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a balloon (c) coins of one kind (d) yeast
32. 32.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the axle (d) the effort
33. 33.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a 30 cm ruler (d) a mirror
34. 34.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a doorknob (c) a bottle opener (d) a see-saw
35. 35.⚖️ 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
36. 36.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) a battery cell (d) a 30 cm ruler
37. 37.True or false: a steering wheel uses a pulley. (a) True (b) False
38. 38.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is hot (c) a lever boosts your push (d) the spoon is magnetic
39. 39.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
40. 40.True or false: a flagpole is a lever. (a) False (b) True

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