Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 699 · 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.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a balloon (c) a 30 cm ruler (d) coins of one kind
2. 2.⚖️ 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 change it (b) we keep it the same (c) we measure it
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 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?
4. 4.⚙️ Which of these uses a pulley? (a) a crowbar (b) a crane (c) a tap handle (d) a doorknob
5. 5.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
6. 6.⚖️ 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) False (b) True
7. 7.⚖️ 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) False (b) True
8. 8.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the right side (c) both go up (d) the left side
9. 9.⚙️ Which simple machine is a slide? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
10. 10.True or false: yeast is needed for the ruler lever. (a) False (b) True
11. 11.True or false: a steering wheel is a lever. (a) False (b) True
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a flat table (d) a mirror
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
14. 14.⚙️ Which of these is a lever? (a) a sloping road (b) a spoon lifting a lid (c) a well pulley (d) a flagpole
15. 15.⚖️ 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 change it (c) we measure it
16. 16.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
17. 17.True or false: a doorknob is a wheel and axle. (a) False (b) True
18. 18.⚖️ 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 change it (b) we keep it the same (c) we measure it
19. 19.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
20. 20.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
22. 22.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) False (b) True
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the kind of coins”? (a) we change it (b) we measure it (c) we keep it the same
24. 24.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
25. 25.⚙️ Which simple machine is a ramp? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
26. 26.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) a battery cell
27. 27.⚖️ 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) where the pencil is (c) the number of coins (d) distance from the pencil
28. 28.⚖️ 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) distance from the pencil (c) which side goes down (d) where the pencil is
29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) the kind of coins (c) which side goes down
30. 30.⚙️ Which of these is a wheel and axle? (a) a crane (b) a slide (c) a flagpole (d) a tap handle
31. 31.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) bend it till it snaps (d) flick coins at faces
32. 32.True or false: a balloon is needed for the ruler lever. (a) True (b) False
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a magnet (d) a 30 cm ruler
34. 34.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the same ruler (b) which side goes down (c) distance from the pencil
36. 36.⚙️ Which simple machine is a steering wheel? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
37. 37.⚖️ 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 change it (c) we keep it the same
38. 38.⚙️ Which simple machine is a flagpole? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
39. 39.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a mirror (d) a flat table
40. 40.⚙️ Which of these is a lever? (a) a crowbar (b) a well pulley (c) a doorknob (d) a tap handle

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