Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 215 · 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.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
2. 2.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are magnetic (c) they are too cold (d) they may swallow them
3. 3.⚖️ 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 keep it the same (b) we change it (c) we measure it
4. 4.True or false: a flagpole uses a pulley. (a) False (b) True
5. 5.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a tap handle (c) a bottle opener (d) a well pulley
6. 6.⚙️ Which of these is a lever? (a) a see-saw (b) a steering wheel (c) a tap handle (d) a crane
7. 7.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a mirror (d) a round pencil
8. 8.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
9. 9.🧺 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 magnet (d) a 30 cm ruler
10. 10.⚖️ 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
11. 11.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) a battery cell (d) a round pencil
12. 12.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
13. 13.True or false: a crane is a lever. (a) False (b) True
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the same ruler (b) where the pencil is (c) which side goes down (d) the kind of coins
15. 15.⚙️ Which simple machine is a crowbar? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
16. 16.⚙️ Which simple machine is a flagpole? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
17. 17.⚖️ 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 change it (c) we keep it the same
18. 18.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) bend it till it snaps (d) stand on the ruler
19. 19.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
20. 20.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
21. 21.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a round pencil (c) a mirror (d) a battery cell
22. 22.⚖️ 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
23. 23.⚖️ 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
24. 24.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the load (c) the effort (d) the axle
25. 25.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a see-saw (c) a bottle opener (d) a crane
26. 26.⚖️ 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 measure it (b) we keep it the same (c) we change it
27. 27.⚖️ 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
28. 28.⚙️ Which of these uses a pulley? (a) a well pulley (b) a see-saw (c) a ramp (d) a sloping road
29. 29.⚖️ 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
30. 30.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
31. 31.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
32. 32.True or false: a see-saw is an inclined plane. (a) True (b) False
33. 33.True or false: yeast is needed for the ruler lever. (a) False (b) True
34. 34.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
35. 35.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
36. 36.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) equal on both sides (d) zero
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 5 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
38. 38.⚙️ Which of these is an inclined plane? (a) a ramp (b) a see-saw (c) a flagpole (d) a spoon lifting a lid
39. 39.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
40. 40.True or false: a tap handle uses a pulley. (a) False (b) True

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