Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 766 · 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 simple machine is a tap handle? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
2. 2.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the effort (d) the fulcrum
3. 3.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) yeast (c) turmeric powder (d) a 30 cm ruler
4. 4.⚙️ Which simple machine is a well pulley? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
5. 5.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) zero (d) equal on both sides
6. 6.⚖️ 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 measure it (c) we change it
7. 7.True or false: a sloping road is a wheel and axle. (a) False (b) True
8. 8.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) easier (d) the same
9. 9.True or false: a flagpole uses a pulley. (a) False (b) True
10. 10.⚖️ 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
11. 11.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
12. 12.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) stand on the ruler (d) bend it till it snaps
13. 13.⚖️ 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?
14. 14.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too cold (d) they are too shiny
15. 15.⚖️ 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?
16. 16.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a tap handle (c) a sloping road (d) a crowbar
17. 17.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
18. 18.⚖️ 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 kind of coins (b) which side goes down (c) where the pencil is (d) the same ruler
19. 19.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
20. 20.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a magnet (d) a round pencil
22. 22.⚖️ 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) which side goes down (b) distance from the pencil (c) where the pencil is (d) the same ruler
23. 23.⚖️ 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
24. 24.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) a mirror
25. 25.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
27. 27.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a ramp (c) a bottle opener (d) a crowbar
28. 28.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the lid gets softer (c) the spoon is magnetic (d) the spoon is hot
29. 29.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
30. 30.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a battery cell (c) turmeric powder (d) a mirror
31. 31.⚖️ 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) False (b) True
32. 32.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a balloon (c) a battery cell (d) a round pencil
33. 33.⚙️ Which of these is a wheel and axle? (a) a bottle opener (b) a ramp (c) a steering wheel (d) a slide
34. 34.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
35. 35.⚖️ 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
36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) turmeric powder
37. 37.⚙️ Which of these is a lever? (a) a doorknob (b) a ramp (c) a see-saw (d) a slide
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
39. 39.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a doorknob (c) a slide (d) a crowbar
40. 40.True or false: a steering wheel is a lever. (a) False (b) True

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