Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 831 · 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: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) harder (d) the same
2. 2.⚖️ 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?
3. 3.⚖️ 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) where the pencil is
4. 4.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
5. 5.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
6. 6.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a battery cell (c) a 30 cm ruler (d) a round pencil
7. 7.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
8. 8.🧺 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 mirror (d) a flat table
9. 9.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the load (c) the effort (d) the axle
10. 10.⚖️ 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 on the middle (d) sit farther from middle
11. 11.⚖️ 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 change it (b) we keep it the same (c) we measure it
12. 12.True or false: yeast is not needed for the ruler lever. (a) False (b) True
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 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?
14. 14.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a ramp (c) a crowbar (d) a bottle opener
15. 15.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) stand on the ruler (d) flick coins at faces
16. 16.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a balloon (c) a flat table (d) a 30 cm ruler
17. 17.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) zero (d) always 10
18. 18.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too cold (c) they are too shiny (d) they are magnetic
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 8 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
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 kind of coins (b) which side goes down (c) where the pencil is (d) distance from the pencil
22. 22.True or false: a flat table is needed for the ruler lever. (a) False (b) True
23. 23.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a well pulley (c) a bottle opener (d) a tap handle
24. 24.⚙️ Which simple machine is a crane? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
25. 25.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) True (b) False
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False
27. 27.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a mirror (d) a 30 cm ruler
28. 28.⚖️ 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 measure it (c) we keep it the same
29. 29.True or false: a slide is a lever. (a) False (b) True
30. 30.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
31. 31.⚙️ Which of these uses a pulley? (a) a crane (b) a crowbar (c) a slide (d) a steering wheel
32. 32.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
33. 33.⚙️ Which simple machine is a ramp? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
34. 34.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
35. 35.⚙️ Which of these uses a pulley? (a) a ramp (b) a crowbar (c) a flagpole (d) a steering wheel
36. 36.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) both go up (c) the right side (d) the left side
37. 37.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
38. 38.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a balloon (c) a 30 cm ruler (d) coins of one kind
39. 39.⚖️ 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) the spoon is magnetic (d) a lever boosts your push
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the number of coins (b) distance from the pencil (c) which side goes down

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