Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 983 · 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) a balloon (b) a round pencil (c) yeast (d) a mirror
2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
4. 4.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
5. 5.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
6. 6.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) sit closer to middle (d) jump up and down
7. 7.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
8. 8.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
9. 9.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they may swallow them (d) they are magnetic
10. 10.🔮 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) the right side (c) both go up (d) neither, it balances
11. 11.⚙️ Which of these is an inclined plane? (a) a ramp (b) a bottle opener (c) a crane (d) a doorknob
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
13. 13.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) stand on the ruler (d) press it gently
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 8 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
15. 15.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a sloping road (c) a tap handle (d) a see-saw
16. 16.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) coins of one kind (d) a mirror
17. 17.True or false: a ramp is a wheel and axle. (a) False (b) True
18. 18.⚖️ 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 change it (b) we keep it the same (c) we measure it
19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) yeast (c) coins of one kind (d) a round pencil
20. 20.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) a lever boosts your push (c) the lid gets softer (d) the spoon is magnetic
21. 21.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
22. 22.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a flat table (c) a 30 cm ruler (d) a round pencil
23. 23.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) equal on both sides (c) bigger on the left (d) zero
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a balloon (c) a flat table (d) a round pencil
25. 25.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) True (b) False
26. 26.True or false: a bottle opener is a lever. (a) False (b) True
27. 27.⚙️ Which simple machine is a crane? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
28. 28.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
29. 29.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
31. 31.True or false: a steering wheel is a wheel and axle. (a) False (b) True
32. 32.⚖️ 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) the same ruler (c) the kind of coins (d) the number of coins
33. 33.True or false: a well pulley is a wheel and axle. (a) True (b) False
34. 34.True or false: a bottle opener is a wheel and axle. (a) True (b) False
35. 35.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
36. 36.⚖️ 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 change it (c) we keep it the same
37. 37.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) a round pencil (d) a balloon
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) False (b) True
39. 39.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
40. 40.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley

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