Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 394 · 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 5 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?
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) neither, it balances (b) the right side (c) the left side (d) both go up
3. 3.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) impossible (d) the same
4. 4.⚖️ 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 measure it (b) we change it (c) we keep it the same
5. 5.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) a 30 cm ruler (d) a mirror
6. 6.⚖️ 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 keep it the same (b) we change it (c) we measure it
7. 7.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they are magnetic (d) they may swallow them
8. 8.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
9. 9.⚖️ 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 number of coins (b) which side goes down (c) distance from the pencil (d) the kind of coins
10. 10.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 5 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
12. 12.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
13. 13.⚙️ Which simple machine is a ramp? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
14. 14.True or false: a tap handle is a wheel and axle. (a) True (b) False
15. 15.True or false: a bottle opener is a lever. (a) True (b) False
16. 16.⚖️ 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) False (b) True
17. 17.⚖️ 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 lid gets softer (d) the spoon is hot
18. 18.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a tap handle (c) a slide (d) a crowbar
19. 19.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a battery cell (c) a 30 cm ruler (d) a balloon
20. 20.True or false: a crane is an inclined plane. (a) True (b) False
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a battery cell (c) a flat table (d) coins of one kind
22. 22.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
23. 23.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a crane (c) a doorknob (d) a see-saw
24. 24.⚙️ Which simple machine is a crowbar? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
25. 25.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) zero (c) bigger on the left (d) always 10
26. 26.⚙️ Which simple machine is a tap handle? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) yeast (c) a 30 cm ruler (d) a round pencil
28. 28.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
29. 29.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit on the middle (c) sit closer to middle (d) jump up and down
30. 30.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a magnet (c) a flat table (d) a round pencil
31. 31.⚖️ 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 number of coins (c) distance from the pencil
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 8 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?
33. 33.⚙️ Which of these uses a pulley? (a) a slide (b) a doorknob (c) a crane (d) a sloping road
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 8 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?
35. 35.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
36. 36.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a magnet (c) coins of one kind (d) a round pencil
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 5 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
39. 39.⚙️ Which of these is a lever? (a) a crowbar (b) a doorknob (c) a crane (d) a steering wheel
40. 40.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False

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