Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 128 · 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 4 coins 3 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
2. 2.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
3. 3.True or false: a ramp is an inclined plane. (a) True (b) False
4. 4.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) yeast
5. 5.⚖️ 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
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a 30 cm ruler (d) a balloon
7. 7.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) press it gently (d) stand on the ruler
8. 8.⚙️ Which of these uses a pulley? (a) a crane (b) a crowbar (c) a ramp (d) a tap handle
9. 9.True or false: a magnet is needed for the ruler lever. (a) False (b) True
10. 10.True or false: a spoon lifting a lid is a lever. (a) False (b) True
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
12. 12.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a magnet (c) a 30 cm ruler (d) a round pencil
13. 13.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
14. 14.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
15. 15.⚖️ 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?
16. 16.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a magnet (c) a balloon (d) a battery cell
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a round pencil (d) yeast
18. 18.⚖️ 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
19. 19.⚙️ Which simple machine is a see-saw? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
20. 20.🧺 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 30 cm ruler (d) a battery cell
21. 21.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) easier (d) impossible
22. 22.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) coins of one kind (c) a balloon (d) a battery cell
23. 23.⚙️ Which simple machine is a ramp? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
24. 24.True or false: a see-saw is a lever. (a) True (b) False
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
26. 26.⚖️ 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 change it (b) we measure it (c) we keep it the same
27. 27.True or false: a mirror is needed for the ruler lever. (a) True (b) False
28. 28.⚙️ Which simple machine is a slide? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
29. 29.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a balloon (c) a 30 cm ruler (d) yeast
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 number of coins (b) distance from the pencil (c) which side goes down
31. 31.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit on the middle (d) sit farther from middle
32. 32.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
33. 33.🔮 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) neither, it balances (d) the left side
34. 34.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
35. 35.⚖️ 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) False (b) True
36. 36.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a bottle opener (c) a sloping road (d) a doorknob
37. 37.⚖️ 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
38. 38.⚖️ 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 keep it the same (b) we measure it (c) we change it
39. 39.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a flagpole (c) a well pulley (d) a crowbar
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False

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