Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 387 · 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.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) press it gently (d) stand on the ruler
2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) the same (d) easier
3. 3.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
4. 4.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
5. 5.🔮 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
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
7. 7.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
8. 8.⚖️ 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
9. 9.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
10. 10.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) always 10 (c) zero (d) equal on both sides
11. 11.True or false: a flagpole uses a pulley. (a) True (b) False
12. 12.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 10 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) the kind of coins (c) the number of coins (d) the same ruler
15. 15.⚖️ 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 change it (b) we measure it (c) we keep it the same
16. 16.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) False (b) True
17. 17.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
18. 18.True or false: a tap handle is a wheel and axle. (a) False (b) True
19. 19.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a ramp (c) a see-saw (d) a crowbar
20. 20.True or false: a ramp is a wheel and axle. (a) False (b) True
21. 21.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
22. 22.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we keep it the same (b) we measure it (c) we change it
24. 24.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
25. 25.True or false: a tap handle is a lever. (a) True (b) False
26. 26.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
27. 27.True or false: a crane uses a pulley. (a) False (b) True
28. 28.True or false: a doorknob uses a pulley. (a) True (b) False
29. 29.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) coins of one kind (c) a magnet (d) a balloon
30. 30.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the lid gets softer (c) the spoon is hot (d) the spoon is magnetic
31. 31.⚙️ Which simple machine is a crowbar? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
32. 32.True or false: a steering wheel is a wheel and axle. (a) True (b) False
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 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?
34. 34.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
35. 35.⚖️ 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
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 kept the same. (a) False (b) True
37. 37.⚖️ 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) which side goes down (b) the number of coins (c) distance from the pencil (d) the kind of coins
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
39. 39.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the load (d) the effort
40. 40.True or false: yeast is not needed for the ruler lever. (a) False (b) True

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