Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 13 · 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.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
2. 2.⚙️ Which simple machine is a crane? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
3. 3.True or false: a sloping road is an inclined plane. (a) True (b) False
4. 4.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) bigger on the left (c) zero (d) always 10
5. 5.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) bend it till it snaps (d) flick coins at faces
6. 6.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
7. 7.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
8. 8.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a battery cell (c) a round pencil (d) a 30 cm ruler
9. 9.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
10. 10.⚙️ Which of these is an inclined plane? (a) a tap handle (b) a bottle opener (c) a slide (d) a crane
11. 11.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a spoon lifting a lid (c) a slide (d) a flagpole
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 2 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.⚖️ 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?
15. 15.⚙️ Which of these is a lever? (a) a slide (b) a sloping road (c) a bottle opener (d) a tap handle
16. 16.⚖️ 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 keep it the same (b) we measure it (c) we change it
17. 17.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) turmeric powder (c) a flat table (d) a round pencil
19. 19.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) a mirror
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) which side goes down (b) distance from the pencil (c) where the pencil is
21. 21.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
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) distance from the pencil (b) the number of coins (c) which side goes down
23. 23.True or false: a balloon is needed for the ruler lever. (a) True (b) False
24. 24.True or false: a bottle opener uses a pulley. (a) False (b) True
25. 25.True or false: a steering wheel is an inclined plane. (a) False (b) True
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
27. 27.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) True (b) False
30. 30.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they may swallow them (d) they are magnetic
31. 31.⚖️ 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) the same ruler (c) the number of coins (d) distance from the pencil
32. 32.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit closer to middle (c) sit farther from middle (d) jump up and down
33. 33.⚖️ 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 measure it (b) we keep it the same (c) we change it
34. 34.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
35. 35.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
36. 36.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
37. 37.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
39. 39.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) a lever boosts your push (c) the spoon is magnetic (d) the spoon is hot
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a mirror (c) coins of one kind (d) a 30 cm ruler

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