Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 64 · 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.🛟 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
2. 2.⚖️ 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 keep it the same (b) we change it (c) we measure it
3. 3.⚖️ 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) distance from the pencil (c) the number of coins (d) where the pencil is
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 1 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?
5. 5.True or false: a slide is a lever. (a) False (b) True
6. 6.⚖️ 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
7. 7.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
8. 8.⚖️ 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) the kind of coins (d) which side goes down
9. 9.🔮 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 left side (b) neither, it balances (c) the right side (d) both go up
10. 10.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
11. 11.🧺 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 flat table (d) a battery cell
12. 12.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a ramp (c) a bottle opener (d) a see-saw
13. 13.⚖️ 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) True (b) False
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we keep it the same (b) we change it (c) we measure it
15. 15.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
16. 16.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) a 30 cm ruler (c) a round pencil (d) coins of one kind
17. 17.🧺 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 magnet
18. 18.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
19. 19.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
20. 20.⚙️ Which of these is a lever? (a) a doorknob (b) a bottle opener (c) a sloping road (d) a flagpole
21. 21.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) flick coins at faces (d) stand on the ruler
22. 22.⚖️ 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 change it (b) we keep it the same (c) we measure it
23. 23.⚖️ 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 change it (c) we keep it the same
24. 24.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) where the pencil is (b) which side goes down (c) distance from the pencil
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 5 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?
28. 28.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) a magnet (d) a battery cell
29. 29.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a slide (c) a steering wheel (d) a see-saw
30. 30.⚖️ 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) distance from the pencil (c) which side goes down
31. 31.⚙️ Which simple machine is a flagpole? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
32. 32.⚖️ 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 number of coins
33. 33.⚖️ 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
34. 34.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
35. 35.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
36. 36.True or false: a ramp uses a pulley. (a) True (b) False
37. 37.⚖️ 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?
38. 38.⚖️ 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) False (b) True
39. 39.True or false: a steering wheel is a wheel and axle. (a) True (b) False
40. 40.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True

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