Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 389 · 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.🛟 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
2. 2.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
3. 3.True or false: a flat table is needed for the ruler lever. (a) False (b) True
4. 4.⚙️ Which simple machine is a spoon lifting a lid? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
5. 5.🛟 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
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
7. 7.True or false: a slide is an inclined plane. (a) True (b) False
8. 8.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) yeast (c) a round pencil (d) a magnet
9. 9.True or false: a well pulley is a lever. (a) False (b) True
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) neither, it balances (b) the right side (c) both go up (d) the left side
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 8 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
12. 12.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) bigger on the left (d) equal on both sides
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
14. 14.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
15. 15.⚖️ 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
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
17. 17.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a 30 cm ruler (d) turmeric powder
18. 18.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a steering wheel (c) a sloping road (d) a well pulley
19. 19.True or false: a magnet is needed for the ruler lever. (a) True (b) False
20. 20.⚖️ 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) distance from the pencil (c) where the pencil is
21. 21.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
22. 22.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a 30 cm ruler (d) a mirror
23. 23.True or false: a balloon is needed for the ruler lever. (a) False (b) True
24. 24.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
25. 25.⚖️ What is the turning point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) False (b) True
27. 27.⚖️ 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) the number of coins (c) which side goes down (d) distance from the pencil
28. 28.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a ramp (c) a flagpole (d) a spoon lifting a lid
29. 29.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) yeast (d) coins of one kind
30. 30.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) yeast (c) a 30 cm ruler (d) coins of one kind
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a round pencil (c) coins of one kind (d) a flat table
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 3 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a 30 cm ruler (d) turmeric powder
34. 34.⚖️ 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) True (b) False
35. 35.True or false: a flagpole uses a pulley. (a) False (b) True
36. 36.⚖️ 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) the number of coins (c) which side goes down (d) distance from the pencil
37. 37.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a steering wheel (c) a bottle opener (d) a flagpole
38. 38.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) which side goes down (c) the same ruler
40. 40.⚙️ Which simple machine is a doorknob? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley

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