Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 745 · 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.⚖️ 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) where the pencil is
2. 2.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
3. 3.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
4. 4.⚙️ Which of these is a lever? (a) a ramp (b) a well pulley (c) a doorknob (d) a bottle opener
5. 5.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
6. 6.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) a round pencil (d) a balloon
7. 7.⚙️ Which of these uses a pulley? (a) a doorknob (b) a ramp (c) a crane (d) a spoon lifting a lid
8. 8.⚙️ Which simple machine is a flagpole? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
9. 9.⚖️ 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) which side goes down (c) the same ruler (d) distance from the pencil
10. 10.True or false: a steering wheel is an inclined plane. (a) False (b) True
11. 11.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) turmeric powder (c) a round pencil (d) a 30 cm ruler
12. 12.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) easier (d) harder
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
15. 15.⚖️ 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 number of coins (b) the same ruler (c) which side goes down (d) distance from the pencil
16. 16.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
17. 17.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
18. 18.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
19. 19.🔮 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) both go up (c) neither, it balances (d) the right side
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) False (b) True
21. 21.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
22. 22.⚖️ 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 change it (b) we measure it (c) we keep it the same
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) False (b) True
24. 24.True or false: a sloping road is an inclined plane. (a) False (b) True
25. 25.⚙️ Which simple machine is a spoon lifting a lid? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
26. 26.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too shiny (c) they are magnetic (d) they are too cold
27. 27.⚙️ Which simple machine is a doorknob? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
28. 28.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) True (b) False
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 10 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
31. 31.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) equal on both sides (d) bigger on the left
32. 32.⚙️ Which simple machine is a crowbar? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
33. 33.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a magnet (c) a balloon (d) turmeric powder
34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) a battery cell
35. 35.⚙️ Which of these is a lever? (a) a doorknob (b) a tap handle (c) a see-saw (d) a flagpole
36. 36.True or false: a sloping road is a wheel and axle. (a) True (b) False
37. 37.⚖️ 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 keep it the same (b) we measure it (c) we change it
38. 38.🛟 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
39. 39.True or false: a bottle opener is a lever. (a) False (b) True
40. 40.⚖️ 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 change it (b) we measure it (c) we keep it the same

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