Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 396 · 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.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
2. 2.⚙️ Which of these is a lever? (a) a crane (b) a doorknob (c) a well pulley (d) a crowbar
3. 3.True or false: a crane is a wheel and axle. (a) True (b) False
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) True (b) False
5. 5.⚙️ Which simple machine is a sloping road? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
6. 6.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
7. 7.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
8. 8.⚖️ 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
9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) False (b) True
10. 10.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
11. 11.⚖️ 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
12. 12.⚙️ Which of these is a lever? (a) a see-saw (b) a slide (c) a sloping road (d) a tap handle
13. 13.True or false: a see-saw is a wheel and axle. (a) True (b) False
14. 14.⚖️ 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 1 cm to the right to balance it?
15. 15.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) coins of one kind (d) a round pencil
16. 16.🔮 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) neither, it balances (c) the right side (d) the left side
17. 17.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
18. 18.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) a battery cell (d) coins of one kind
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 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.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the same ruler (b) the number of coins (c) distance from the pencil (d) which side goes down
21. 21.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a mirror (c) a battery cell (d) a magnet
22. 22.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a battery cell (d) a round pencil
24. 24.⚙️ Which of these uses a pulley? (a) a flagpole (b) a crowbar (c) a sloping road (d) a steering wheel
25. 25.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
26. 26.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
28. 28.⚙️ Which of these is a lever? (a) a slide (b) a well pulley (c) a spoon lifting a lid (d) a ramp
29. 29.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too shiny (c) they may swallow them (d) they are too cold
30. 30.⚖️ 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) a lever boosts your push (d) the spoon is magnetic
31. 31.⚙️ Which of these uses a pulley? (a) a crowbar (b) a see-saw (c) a spoon lifting a lid (d) a well pulley
32. 32.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
33. 33.True or false: a crowbar is a lever. (a) False (b) True
34. 34.⚖️ 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
35. 35.⚖️ 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
36. 36.⚖️ 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
37. 37.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) stand on the ruler (d) bend it till it snaps
38. 38.🧺 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 magnet (d) a flat table
39. 39.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
40. 40.⚙️ Which of these uses a pulley? (a) a tap handle (b) a crane (c) a slide (d) a ramp

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