Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 124 · 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 round pencil (b) coins of one kind (c) a balloon (d) a flat table
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 8 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
3. 3.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
4. 4.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) stand on the ruler (d) press it gently
5. 5.⚙️ Which simple machine is a sloping road? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
6. 6.⚙️ Which of these is a lever? (a) a sloping road (b) a see-saw (c) a flagpole (d) a doorknob
7. 7.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a flat table (c) a magnet (d) turmeric powder
8. 8.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit closer to middle (c) jump up and down (d) sit on the middle
9. 9.True or false: a bottle opener is a lever. (a) False (b) True
10. 10.⚖️ 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) True (b) False
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 magnet
12. 12.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
13. 13.⚖️ What is the turning point of a lever called? (a) the axle (b) the effort (c) the load (d) the fulcrum
14. 14.⚖️ 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
15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a mirror (d) coins of one kind
16. 16.⚖️ 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 change it (b) we keep it the same (c) we measure it
17. 17.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
18. 18.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 6 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) False (b) True
21. 21.🧺 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 flat table
22. 22.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the left side (c) the right side (d) both go up
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
24. 24.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a spoon lifting a lid (c) a steering wheel (d) a sloping road
25. 25.⚖️ 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
26. 26.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
27. 27.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a bottle opener (c) a well pulley (d) a doorknob
28. 28.⚖️ 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
29. 29.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
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.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) yeast (d) a 30 cm ruler
32. 32.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) always 10 (d) equal on both sides
33. 33.⚙️ Which of these is a lever? (a) a bottle opener (b) a doorknob (c) a sloping road (d) a crane
34. 34.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a balloon (c) a flat table (d) a 30 cm ruler
35. 35.⚖️ 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) the kind of coins (c) which side goes down
36. 36.⚖️ 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) True (b) False
37. 37.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) turmeric powder (c) a mirror (d) a magnet
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 10 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
39. 39.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
40. 40.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a battery cell (c) a magnet (d) a round pencil

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