Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 246 · 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.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
2. 2.⚖️ 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 keep it the same (b) we change it (c) we measure it
3. 3.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 5 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
5. 5.⚖️ 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 change it (b) we keep it the same (c) we measure it
6. 6.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a crowbar (c) a tap handle (d) a slide
7. 7.True or false: a well pulley is a lever. (a) True (b) False
8. 8.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they may swallow them (d) they are too shiny
9. 9.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) flick coins at faces (d) press it gently
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) the right side (b) the left side (c) both go up (d) neither, it balances
11. 11.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) equal on both sides (d) always 10
12. 12.⚙️ Which simple machine is a crowbar? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
13. 13.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) easier (d) the same
14. 14.⚖️ 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) which side goes down (c) the number of coins (d) distance from the pencil
15. 15.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) jump up and down (d) sit farther from middle
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
17. 17.⚖️ 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
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) turmeric powder (d) a flat table
19. 19.⚙️ Which of these is a wheel and axle? (a) a bottle opener (b) a crowbar (c) a steering wheel (d) a see-saw
20. 20.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a crane (c) a tap handle (d) a spoon lifting a lid
21. 21.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a spoon lifting a lid (c) a see-saw (d) a ramp
22. 22.⚖️ 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) the kind of coins (c) distance from the pencil
23. 23.⚙️ Which simple machine is a flagpole? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
24. 24.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) a round pencil (d) a flat table
25. 25.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
26. 26.True or false: a crane is a wheel and axle. (a) False (b) True
27. 27.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is what we measure. (a) False (b) True
29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a mirror (c) a 30 cm ruler (d) a round pencil
30. 30.⚖️ 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) True (b) False
31. 31.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a tap handle (c) a bottle opener (d) a well pulley
32. 32.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
33. 33.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
34. 34.True or false: a crane is an inclined plane. (a) False (b) True
35. 35.⚖️ 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 10 cm to the right to balance it?
36. 36.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
37. 37.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a flat table (c) a balloon (d) yeast
38. 38.True or false: a steering wheel is a lever. (a) False (b) True
39. 39.⚙️ Which of these uses a pulley? (a) a flagpole (b) a sloping road (c) a crowbar (d) a ramp
40. 40.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle

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