Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 43 · 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 may swallow them (b) they are too cold (c) they are magnetic (d) they are too shiny
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 6 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 10 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
4. 4.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) the spoon is magnetic (d) a lever boosts your push
5. 5.⚖️ 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) the number of coins (c) which side goes down
6. 6.⚙️ Which of these is an inclined plane? (a) a sloping road (b) a doorknob (c) a well pulley (d) a flagpole
7. 7.⚖️ 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
8. 8.🧺 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 flat table (d) a mirror
9. 9.True or false: yeast is not needed for the ruler lever. (a) False (b) True
10. 10.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
11. 11.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) bigger on the left (c) always 10 (d) zero
12. 12.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) flick coins at faces (d) stand on the ruler
13. 13.⚙️ Which of these is a lever? (a) a doorknob (b) a see-saw (c) a steering wheel (d) a tap handle
14. 14.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) yeast (c) a magnet (d) a flat table
15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a round pencil (d) a magnet
16. 16.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
17. 17.True or false: a tap handle is a wheel and axle. (a) True (b) False
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
19. 19.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
20. 20.True or false: a doorknob is an inclined plane. (a) True (b) False
21. 21.⚖️ 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 same ruler (b) distance from the pencil (c) which side goes down (d) the kind of coins
22. 22.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
23. 23.True or false: yeast is needed for the ruler lever. (a) True (b) False
24. 24.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
25. 25.⚖️ 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) where the pencil is (c) which side goes down
26. 26.⚙️ Which simple machine is a flagpole? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
27. 27.⚖️ 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
28. 28.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit closer to middle (c) sit farther from middle (d) sit on the middle
29. 29.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) True (b) False
31. 31.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a mirror (c) a magnet (d) a 30 cm ruler
32. 32.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we change it (b) we measure it (c) we keep it the same
33. 33.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a tap handle (c) a well pulley (d) a slide
34. 34.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
35. 35.True or false: a ramp uses a pulley. (a) False (b) True
36. 36.True or false: a steering wheel is a wheel and axle. (a) True (b) False
37. 37.True or false: a flagpole uses a pulley. (a) True (b) False
38. 38.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
39. 39.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) coins of one kind (c) a round pencil (d) a flat table
40. 40.True or false: a well pulley uses a pulley. (a) True (b) False

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