Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 390 · 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 flat table (b) a round pencil (c) yeast (d) coins of one kind
2. 2.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
3. 3.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the spoon is hot (c) a lever boosts your push (d) the lid gets softer
4. 4.⚖️ 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
5. 5.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) sit closer to middle (d) jump up and down
6. 6.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) bend it till it snaps (d) press it gently
7. 7.⚖️ 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) which side goes down (c) the kind of coins (d) the number of coins
8. 8.⚙️ Which of these is a lever? (a) a see-saw (b) a steering wheel (c) a doorknob (d) a slide
9. 9.True or false: a crowbar is a wheel and axle. (a) True (b) False
10. 10.⚙️ Which of these uses a pulley? (a) a crane (b) a spoon lifting a lid (c) a bottle opener (d) a crowbar
11. 11.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
12. 12.⚖️ 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
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 12 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
14. 14.True or false: a see-saw is a lever. (a) False (b) True
15. 15.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
16. 16.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
17. 17.🧺 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 battery cell (d) a flat table
18. 18.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
19. 19.True or false: a crowbar is a lever. (a) False (b) True
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a balloon (d) coins of one kind
21. 21.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) harder (d) easier
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 the one thing we change. (a) True (b) False
23. 23.🔮 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) the left side (d) neither, it balances
24. 24.⚖️ 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
25. 25.🧺 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 mirror
26. 26.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a doorknob (c) a spoon lifting a lid (d) a sloping road
27. 27.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
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) True (b) False
29. 29.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too cold (d) they are too shiny
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) distance from the pencil (b) which side goes down (c) the same ruler
31. 31.⚙️ Which of these is a lever? (a) a well pulley (b) a steering wheel (c) a bottle opener (d) a flagpole
32. 32.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) a magnet (d) a round pencil
33. 33.⚖️ 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
34. 34.⚖️ 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
35. 35.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a sloping road (c) a tap handle (d) a see-saw
36. 36.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
37. 37.⚙️ Which simple machine is a see-saw? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
38. 38.⚖️ 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
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 10 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?
40. 40.⚙️ Which simple machine is a ramp? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever

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