Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 378 · 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) impossible (b) the same (c) harder (d) easier
2. 2.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
3. 3.True or false: a slide is an inclined plane. (a) False (b) True
4. 4.⚖️ 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
5. 5.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
6. 6.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
7. 7.🔮 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
8. 8.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a round pencil (c) a battery cell (d) a magnet
9. 9.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) coins of one kind (c) a round pencil (d) a 30 cm ruler
11. 11.True or false: a mirror is needed for the ruler lever. (a) True (b) False
12. 12.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
13. 13.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a round pencil (d) a balloon
14. 14.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a flat table (c) a mirror (d) a balloon
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 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?
16. 16.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the axle (c) the load (d) the effort
17. 17.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
18. 18.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) a balloon (d) a battery cell
19. 19.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) a magnet (d) a round pencil
20. 20.True or false: a doorknob is a wheel and axle. (a) False (b) True
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 12 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
22. 22.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) a flat table (d) a battery cell
23. 23.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
24. 24.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) False (b) True
25. 25.⚙️ Which of these is a lever? (a) a flagpole (b) a ramp (c) a spoon lifting a lid (d) a tap handle
26. 26.⚖️ 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) where the pencil is (c) which side goes down (d) distance from the pencil
27. 27.⚖️ 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
28. 28.⚙️ Which of these is a lever? (a) a see-saw (b) a crane (c) a steering wheel (d) a tap handle
29. 29.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) a lever boosts your push (d) the spoon is hot
30. 30.🛟 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
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) a battery cell (d) coins of one kind
32. 32.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a spoon lifting a lid (c) a crowbar (d) a see-saw
33. 33.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) press it gently (d) bend it till it snaps
34. 34.True or false: a well pulley is a lever. (a) False (b) True
35. 35.⚙️ Which simple machine is a doorknob? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 1 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
37. 37.⚙️ Which of these uses a pulley? (a) a see-saw (b) a crane (c) a bottle opener (d) a sloping road
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
40. 40.True or false: a well pulley is a wheel and axle. (a) True (b) False

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