Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 970 · 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.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) harder (d) impossible
2. 2.⚙️ Which of these is a lever? (a) a sloping road (b) a ramp (c) a see-saw (d) a crane
3. 3.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
4. 4.🔮 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) neither, it balances (c) both go up (d) the right side
5. 5.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 1 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?
7. 7.🛟 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
8. 8.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) False (b) True
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) distance from the pencil (b) which side goes down (c) the kind of coins (d) the same ruler
10. 10.True or false: a steering wheel is a lever. (a) True (b) False
11. 11.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a magnet (c) coins of one kind (d) a 30 cm ruler
13. 13.True or false: a well pulley is an inclined plane. (a) False (b) True
14. 14.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
15. 15.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
16. 16.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
17. 17.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too cold (c) they are too shiny (d) they are magnetic
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 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?
19. 19.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
20. 20.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a magnet (c) a balloon (d) a battery cell
21. 21.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) sit farther from middle (d) jump up and down
22. 22.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) coins of one kind (c) a 30 cm ruler (d) a flat table
23. 23.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
24. 24.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
26. 26.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
27. 27.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
28. 28.True or false: a balloon is needed for the ruler lever. (a) True (b) False
29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a round pencil (c) a 30 cm ruler (d) a flat table
30. 30.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) a lever boosts your push (c) the spoon is hot (d) the lid gets softer
31. 31.⚖️ 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
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
33. 33.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) the kind of coins (c) distance from the pencil
34. 34.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) yeast (c) a battery cell (d) a round pencil
35. 35.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
36. 36.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
37. 37.True or false: a ramp is a wheel and axle. (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 “distance from the pencil”? (a) we keep it the same (b) we change it (c) we measure it
39. 39.⚖️ 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 same ruler (b) distance from the pencil (c) where the pencil is (d) which side goes down
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 12 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?

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