Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 668 · 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.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a balloon (c) a flat table (d) a magnet
2. 2.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) flick coins at faces (d) press it gently
3. 3.True or false: a see-saw is a wheel and axle. (a) False (b) True
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 kind of coins (b) distance from the pencil (c) where the pencil is (d) the number of coins
5. 5.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the left side (c) both go up (d) the right side
6. 6.⚖️ 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) True (b) False
7. 7.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) bigger on the left (d) zero
8. 8.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
9. 9.True or false: yeast is not needed for the ruler lever. (a) False (b) True
10. 10.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
12. 12.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) impossible (d) the same
13. 13.True or false: a flat table is needed for the ruler lever. (a) False (b) True
14. 14.⚖️ 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 measure it (b) we keep it the same (c) we change it
15. 15.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “which side goes down”? (a) we measure it (b) we change it (c) we keep it the same
16. 16.⚖️ 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 keep it the same (b) we measure it (c) we change it
17. 17.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is hot (c) a lever boosts your push (d) the spoon is magnetic
18. 18.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a spoon lifting a lid (c) a crowbar (d) a well pulley
19. 19.⚖️ 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 1 cm to the right to balance it?
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) True (b) False
21. 21.⚖️ 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 measure it (b) we keep it the same (c) we change it
22. 22.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
23. 23.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
24. 24.True or false: a magnet is needed for the ruler lever. (a) True (b) False
25. 25.⚙️ Which of these is a lever? (a) a crane (b) a flagpole (c) a bottle opener (d) a well pulley
26. 26.🧺 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
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 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?
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) distance from the pencil (c) the number of coins (d) the kind of coins
29. 29.True or false: a slide uses a pulley. (a) True (b) False
30. 30.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a balloon (c) coins of one kind (d) a 30 cm ruler
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) coins of one kind (d) a mirror
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 10 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
33. 33.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
34. 34.⚖️ What is the turning point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
35. 35.⚙️ Which of these uses a pulley? (a) a ramp (b) a well pulley (c) a doorknob (d) a bottle opener
36. 36.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a bottle opener (c) a crane (d) a slide
37. 37.True or false: a bottle opener is a lever. (a) True (b) False
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) True (b) False
39. 39.⚙️ Which of these is an inclined plane? (a) a tap handle (b) a flagpole (c) a ramp (d) a well pulley
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a round pencil (d) a battery cell

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