Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 327 · 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.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
2. 2.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a magnet (c) a battery cell (d) turmeric powder
3. 3.⚙️ Which simple machine is a see-saw? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
4. 4.⚖️ 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 same ruler (b) the number of coins (c) the kind of coins (d) distance from the pencil
5. 5.True or false: a crowbar is a wheel and axle. (a) False (b) True
6. 6.True or false: a spoon lifting a lid uses a pulley. (a) True (b) False
7. 7.True or false: yeast is not needed for the ruler lever. (a) False (b) True
8. 8.⚖️ What is the turning point of a lever called? (a) the axle (b) the load (c) the effort (d) the fulcrum
9. 9.⚖️ 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 measure it (c) we keep it the same
10. 10.⚖️ 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 change it (b) we keep it the same (c) we measure it
11. 11.⚖️ 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
12. 12.⚖️ 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) False (b) True
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) False (b) True
14. 14.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) a flat table (c) coins of one kind (d) a round pencil
15. 15.⚙️ Which simple machine is a bottle opener? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
16. 16.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) always 10 (d) equal on both sides
17. 17.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
18. 18.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) stand on the ruler (d) bend it till it snaps
19. 19.⚖️ 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
20. 20.🧺 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 mirror
21. 21.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) a lever boosts your push (c) the spoon is magnetic (d) the lid gets softer
22. 22.⚙️ Which of these is a lever? (a) a bottle opener (b) a tap handle (c) a steering wheel (d) a doorknob
23. 23.⚙️ Which simple machine is a steering wheel? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
24. 24.⚖️ 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
25. 25.⚙️ Which of these is a wheel and axle? (a) a slide (b) a crowbar (c) a tap handle (d) a flagpole
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
27. 27.⚖️ 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
28. 28.⚙️ Which of these is a lever? (a) a slide (b) a spoon lifting a lid (c) a crane (d) a steering wheel
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
30. 30.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
31. 31.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
33. 33.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a round pencil (c) a mirror (d) yeast
34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a flat table (d) turmeric powder
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a magnet (c) a flat table (d) a 30 cm ruler
36. 36.🔮 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) the left side (d) neither, it balances
37. 37.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a 30 cm ruler (c) turmeric powder (d) a battery cell
38. 38.⚙️ Which simple machine is a ramp? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 10 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?

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