Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 422 · 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.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a tap handle (c) a crane (d) a bottle opener
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 5 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
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) distance from the pencil (b) the number of coins (c) where the pencil is (d) which side goes down
4. 4.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
5. 5.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
6. 6.⚖️ 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 measure it (b) we keep it the same (c) we change it
7. 7.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
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 the one thing we change. (a) True (b) False
9. 9.⚙️ Which of these is a lever? (a) a well pulley (b) a doorknob (c) a bottle opener (d) a flagpole
10. 10.⚙️ Which of these is a lever? (a) a flagpole (b) a ramp (c) a see-saw (d) a sloping road
11. 11.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) flick coins at faces (d) stand on the ruler
12. 12.⚙️ Which of these is a lever? (a) a doorknob (b) a well pulley (c) a flagpole (d) a spoon lifting a lid
13. 13.True or false: a slide is an inclined plane. (a) False (b) True
14. 14.True or false: a flat table is needed for the ruler lever. (a) True (b) False
15. 15.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) a battery cell (d) a 30 cm ruler
16. 16.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) sit farther from middle (d) jump up and down
17. 17.🔮 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 left side (b) the right side (c) both go up (d) neither, it balances
18. 18.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the spoon is hot (c) a lever boosts your push (d) the lid gets softer
19. 19.⚖️ 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
20. 20.⚖️ 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 2 cm to the right to balance it?
21. 21.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they are too shiny (d) they may swallow them
22. 22.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
23. 23.True or false: yeast is 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? Which of these is kept the same? (a) which side goes down (b) distance from the pencil (c) the same ruler
25. 25.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) coins of one kind (c) a battery cell (d) a mirror
26. 26.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a round pencil (c) a 30 cm ruler (d) coins of one kind
27. 27.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
28. 28.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
29. 29.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
30. 30.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
31. 31.⚙️ Which simple machine is a sloping road? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
32. 32.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) yeast (d) a 30 cm ruler
33. 33.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) False (b) True
36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) yeast (d) coins of one kind
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) coins of one kind (c) a round pencil (d) a flat table
38. 38.⚖️ 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
39. 39.True or false: a flagpole uses a pulley. (a) False (b) True
40. 40.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed

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