Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 828 · 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.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) the right side (c) the left side (d) neither, it balances
2. 2.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) jump up and down (c) sit farther from middle (d) sit closer to middle
3. 3.⚖️ 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
4. 4.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
5. 5.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a ramp (c) a steering wheel (d) a crane
6. 6.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
7. 7.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) flick coins at faces (d) bend it till it snaps
8. 8.True or false: a crowbar is a lever. (a) False (b) True
9. 9.⚙️ Which of these uses a pulley? (a) a crowbar (b) a spoon lifting a lid (c) a well pulley (d) a sloping road
10. 10.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a magnet (d) a 30 cm ruler
12. 12.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
13. 13.True or false: a flagpole is an inclined plane. (a) True (b) False
14. 14.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
15. 15.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a battery cell (c) a 30 cm ruler (d) coins of one kind
16. 16.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a battery cell (c) coins of one kind (d) a 30 cm ruler
17. 17.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
18. 18.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
19. 19.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
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) distance from the pencil (b) which side goes down (c) the same ruler
21. 21.True or false: a steering wheel is a wheel and axle. (a) False (b) True
22. 22.⚖️ 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
23. 23.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
24. 24.⚖️ 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?
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 kept the same. (a) False (b) True
26. 26.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) always 10 (d) bigger on the left
27. 27.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
28. 28.⚖️ What is the turning point of a lever called? (a) the axle (b) the effort (c) the fulcrum (d) the load
29. 29.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) a magnet (d) a mirror
30. 30.⚖️ 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?
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) which side goes down (c) the same ruler (d) the kind of coins
32. 32.True or false: a tap handle is a wheel and axle. (a) False (b) True
33. 33.⚖️ 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 keep it the same (b) we change it (c) we measure it
34. 34.⚙️ Which simple machine is a ramp? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) True (b) False
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 12 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?
37. 37.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
38. 38.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
39. 39.True or false: a spoon lifting a lid is an inclined plane. (a) False (b) True
40. 40.⚙️ Which of these is a wheel and axle? (a) a well pulley (b) a doorknob (c) a see-saw (d) a crane

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