Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 806 · 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.🛟 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
3. 3.⚖️ 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) where the pencil is (c) distance from the pencil (d) the same ruler
4. 4.⚖️ 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 keep it the same (b) we measure it (c) we change it
5. 5.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
6. 6.⚖️ 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 keep it the same (b) we change it (c) we measure it
7. 7.⚖️ 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 measure it (b) we keep it the same (c) we change it
8. 8.⚖️ 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) False (b) True
9. 9.⚙️ Which simple machine is a slide? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) coins of one kind (d) a balloon
11. 11.⚖️ 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
12. 12.⚙️ Which of these uses a pulley? (a) a slide (b) a crane (c) a steering wheel (d) a see-saw
13. 13.⚖️ 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) False (b) True
14. 14.⚙️ Which of these is a lever? (a) a flagpole (b) a slide (c) a crowbar (d) a well pulley
15. 15.True or false: a balloon is needed for the ruler lever. (a) True (b) False
16. 16.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) a lever boosts your push (c) the lid gets softer (d) the spoon is hot
17. 17.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
18. 18.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
19. 19.True or false: a see-saw is a lever. (a) False (b) True
20. 20.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the right side (b) neither, it balances (c) the left side (d) both go up
21. 21.True or false: a slide is a lever. (a) False (b) True
22. 22.⚙️ Which of these uses a pulley? (a) a see-saw (b) a spoon lifting a lid (c) a well pulley (d) a sloping road
23. 23.True or false: a crowbar is an inclined plane. (a) True (b) False
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a magnet (d) a round pencil
25. 25.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
26. 26.⚖️ 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) True (b) False
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
28. 28.⚙️ Which simple machine is a bottle opener? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
29. 29.True or false: yeast is not needed for the ruler lever. (a) False (b) True
30. 30.⚙️ Which of these is a wheel and axle? (a) a spoon lifting a lid (b) a see-saw (c) a steering wheel (d) a flagpole
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) False (b) True
32. 32.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
33. 33.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a crane (c) a see-saw (d) a ramp
34. 34.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
35. 35.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) jump up and down (d) sit farther from middle
36. 36.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a 30 cm ruler (c) a magnet (d) yeast
37. 37.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a balloon (c) a mirror (d) coins of one kind
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 3 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
39. 39.True or false: a crane is a lever. (a) False (b) True
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 5 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?

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