Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 577 · 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 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
2. 2.🔮 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 right side (b) neither, it balances (c) the left side (d) both go up
3. 3.True or false: a balloon is needed for the ruler lever. (a) False (b) True
4. 4.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
5. 5.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
6. 6.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
7. 7.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
8. 8.True or false: a flagpole is a lever. (a) False (b) True
9. 9.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) yeast (d) a 30 cm ruler
11. 11.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
12. 12.⚙️ Which of these uses a pulley? (a) a well pulley (b) a see-saw (c) a steering wheel (d) a ramp
13. 13.True or false: a see-saw 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? True or false: which side goes down is what we measure. (a) False (b) True
15. 15.True or false: a well pulley is a lever. (a) True (b) False
16. 16.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) coins of one kind (d) yeast
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
18. 18.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a crane (c) a sloping road (d) a steering wheel
19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a 30 cm ruler (c) a round pencil (d) a flat table
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False
21. 21.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
22. 22.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a tap handle (c) a slide (d) a flagpole
23. 23.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the spoon is hot (c) the lid gets softer (d) the spoon is magnetic
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a balloon (d) a flat table
25. 25.⚖️ 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?
26. 26.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
27. 27.⚖️ 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 2 cm to the right to balance it?
28. 28.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) flick coins at faces (d) bend it till it snaps
29. 29.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
30. 30.⚖️ 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
31. 31.True or false: turmeric powder is needed for the ruler lever. (a) True (b) False
32. 32.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
33. 33.⚙️ Which simple machine is a flagpole? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
34. 34.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a round pencil (d) a balloon
35. 35.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a tap handle (c) a spoon lifting a lid (d) a crane
36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
37. 37.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) equal on both sides (d) bigger on the left
38. 38.True or false: a magnet is needed for the ruler lever. (a) True (b) False
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
40. 40.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit closer to middle (d) sit on the middle

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