Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 796 · 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.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) turmeric powder
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a flat table (c) a round pencil (d) a 30 cm ruler
4. 4.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a magnet (c) a battery cell (d) coins of one kind
5. 5.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a 30 cm ruler (c) a flat table (d) coins of one kind
8. 8.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a mirror (c) a battery cell (d) a round pencil
9. 9.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
10. 10.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
11. 11.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
12. 12.⚖️ 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
13. 13.True or false: a see-saw is an inclined plane. (a) False (b) True
14. 14.True or false: a well pulley uses a pulley. (a) False (b) True
15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a magnet (c) coins of one kind (d) a flat table
16. 16.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
17. 17.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit on the middle (c) sit closer to middle (d) sit farther from middle
18. 18.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a magnet (c) a round pencil (d) coins of one kind
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) False (b) True
20. 20.True or false: a balloon is needed for the ruler lever. (a) True (b) False
21. 21.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
22. 22.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is hot (c) a lever boosts your push (d) the spoon is magnetic
23. 23.⚖️ 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 measure it (b) we keep it the same (c) we change it
24. 24.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a flat table (d) a balloon
25. 25.⚖️ 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?
26. 26.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a bottle opener (c) a sloping road (d) a doorknob
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
28. 28.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) stand on the ruler (d) bend it till it snaps
29. 29.⚙️ Which simple machine is a tap handle? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
30. 30.⚙️ Which of these is a lever? (a) a sloping road (b) a see-saw (c) a steering wheel (d) a well pulley
31. 31.⚙️ Which simple machine is a bottle opener? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
32. 32.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) yeast (d) coins of one kind
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
34. 34.⚖️ 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 number of coins (b) distance from the pencil (c) where the pencil is (d) which side goes down
35. 35.⚖️ 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?
36. 36.⚖️ 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) where the pencil is (d) the kind of coins
37. 37.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a crane (c) a bottle opener (d) a well pulley
38. 38.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
39. 39.⚖️ 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) True (b) False
40. 40.⚙️ Which of these uses a pulley? (a) a doorknob (b) a ramp (c) a see-saw (d) a crane

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