Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 209 · 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.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
2. 2.⚖️ 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) where the pencil is (b) the number of coins (c) the kind of coins (d) distance from the pencil
3. 3.⚖️ 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
4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) a battery cell
5. 5.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a magnet (c) coins of one kind (d) a balloon
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
7. 7.⚖️ 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?
8. 8.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
9. 9.True or false: a sloping road is an inclined plane. (a) False (b) True
10. 10.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
11. 11.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) bend it till it snaps (d) stand on the ruler
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) coins of one kind (d) a mirror
13. 13.⚙️ Which simple machine is a bottle opener? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
14. 14.True or false: a spoon lifting a lid is a lever. (a) False (b) True
15. 15.⚖️ 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 same ruler (c) the number of coins (d) which side goes down
16. 16.⚖️ 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 measure it (c) we keep it the same
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 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?
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
19. 19.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
20. 20.⚙️ Which simple machine is a crowbar? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
21. 21.True or false: a crowbar is a lever. (a) False (b) True
22. 22.True or false: a doorknob is a wheel and axle. (a) True (b) False
23. 23.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
24. 24.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
25. 25.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
26. 26.True or false: turmeric powder is needed for the ruler lever. (a) True (b) False
27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we measure it (b) we keep it the same (c) we change it
29. 29.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) sit farther from middle (d) jump up and down
30. 30.⚙️ Which simple machine is a doorknob? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
31. 31.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
32. 32.⚙️ Which simple machine is a sloping road? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
33. 33.⚖️ 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) False (b) True
34. 34.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
35. 35.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too shiny (c) they are too cold (d) they may swallow them
36. 36.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) yeast (d) a magnet
37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) False (b) True
38. 38.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) a lever boosts your push (c) the spoon is hot (d) the spoon is magnetic
39. 39.⚖️ 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
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) False (b) True

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