Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 170 · 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.⚖️ 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 number of coins (b) where the pencil is (c) distance from the pencil (d) the kind of coins
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a mirror (c) a round pencil (d) coins of one kind
3. 3.🛟 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
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 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?
5. 5.⚙️ Which of these uses a pulley? (a) a slide (b) a steering wheel (c) a flagpole (d) a crowbar
6. 6.🔮 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) neither, it balances (c) the left side (d) the right side
7. 7.⚖️ 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
8. 8.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) False (b) True
9. 9.True or false: a crowbar is a lever. (a) False (b) True
10. 10.True or false: a balloon is needed for the ruler 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.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 8 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
13. 13.True or false: a mirror is needed for the ruler lever. (a) True (b) False
14. 14.True or false: a spoon lifting a lid uses a pulley. (a) False (b) True
15. 15.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) coins of one kind (d) a magnet
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 5 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
17. 17.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are too cold (d) they are magnetic
18. 18.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
19. 19.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 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?
22. 22.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a magnet (c) a 30 cm ruler (d) a flat table
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) coins of one kind (c) a flat table (d) a 30 cm ruler
25. 25.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
26. 26.True or false: a well pulley is a lever. (a) False (b) True
27. 27.⚙️ Which of these is an inclined plane? (a) a tap handle (b) a spoon lifting a lid (c) a bottle opener (d) a sloping road
28. 28.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
29. 29.⚙️ Which of these is a wheel and axle? (a) a flagpole (b) a spoon lifting a lid (c) a slide (d) a tap handle
30. 30.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
31. 31.True or false: yeast is not needed for the ruler lever. (a) True (b) False
32. 32.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
33. 33.⚙️ Which of these uses a pulley? (a) a see-saw (b) a crowbar (c) a doorknob (d) a well pulley
34. 34.True or false: a flat table is needed for the ruler lever. (a) True (b) False
35. 35.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 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?
36. 36.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) False (b) True
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 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?
38. 38.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
40. 40.⚖️ 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

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