Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 230 · 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 5 coins 6 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
2. 2.True or false: a crane is a wheel and axle. (a) False (b) True
3. 3.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
4. 4.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a ramp (c) a well pulley (d) a see-saw
5. 5.⚙️ Which of these is a lever? (a) a tap handle (b) a steering wheel (c) a well pulley (d) a crowbar
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 1 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?
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 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?
8. 8.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
10. 10.True or false: a flagpole is a wheel and axle. (a) False (b) True
11. 11.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
12. 12.⚙️ Which simple machine is a sloping road? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
13. 13.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) press it gently (d) flick coins at faces
14. 14.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) a magnet (d) coins of one kind
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
16. 16.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a crowbar (c) a tap handle (d) a bottle opener
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
18. 18.⚖️ 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?
19. 19.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too cold (d) they are too shiny
20. 20.⚙️ Which of these is a lever? (a) a sloping road (b) a ramp (c) a spoon lifting a lid (d) a slide
21. 21.True or false: a doorknob is a wheel and axle. (a) False (b) True
22. 22.⚙️ Which of these is a lever? (a) a steering wheel (b) a crane (c) a bottle opener (d) a doorknob
23. 23.⚙️ Which simple machine is a see-saw? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
24. 24.🧺 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 flat table (d) yeast
25. 25.⚖️ 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) where the pencil is (d) distance from the pencil
26. 26.True or false: a mirror is needed for the ruler lever. (a) False (b) True
27. 27.True or false: a spoon lifting a lid is a lever. (a) False (b) True
28. 28.True or false: a sloping road is an inclined plane. (a) False (b) True
29. 29.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit closer to middle (d) sit on the middle
30. 30.⚖️ 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 change it (b) we measure it (c) we keep it the same
31. 31.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
32. 32.True or false: a bottle opener is a lever. (a) False (b) True
33. 33.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
34. 34.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
35. 35.⚖️ 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?
36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) turmeric powder
37. 37.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) yeast (c) a magnet (d) a flat table
38. 38.True or false: yeast is needed for the ruler lever. (a) False (b) True
39. 39.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a sloping road (c) a spoon lifting a lid (d) a doorknob
40. 40.True or false: a well pulley is a wheel and axle. (a) True (b) False

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