Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 416 · 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.True or false: a bottle opener is a lever. (a) True (b) False
2. 2.⚖️ 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 change it (b) we keep it the same (c) we measure it
3. 3.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
4. 4.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the axle (c) the effort (d) the load
5. 5.⚖️ 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?
6. 6.⚙️ Which of these is a wheel and axle? (a) a crane (b) a slide (c) a bottle opener (d) a tap handle
7. 7.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a ramp (c) a crane (d) a bottle opener
8. 8.⚙️ Which of these uses a pulley? (a) a flagpole (b) a spoon lifting a lid (c) a steering wheel (d) a slide
9. 9.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a see-saw (c) a sloping road (d) a flagpole
10. 10.True or false: a balloon is needed for the ruler lever. (a) True (b) False
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 12 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?
12. 12.⚖️ 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) the number of coins (c) distance from the pencil (d) the same ruler
13. 13.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) jump up and down (d) sit closer to middle
14. 14.⚖️ 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?
15. 15.🧺 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 flat table (d) yeast
16. 16.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) True (b) False
17. 17.True or false: yeast is not needed for the ruler lever. (a) True (b) False
18. 18.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
19. 19.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) press it gently (d) bend it till it snaps
20. 20.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are too shiny (d) they are magnetic
21. 21.⚙️ Which simple machine is a tap handle? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
22. 22.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
23. 23.⚖️ 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 change it (c) we keep it the same
24. 24.True or false: a tap handle uses a pulley. (a) False (b) True
25. 25.⚙️ Which simple machine is a slide? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
26. 26.⚙️ Which simple machine is a sloping road? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
28. 28.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) the spoon is hot (d) a lever boosts your push
29. 29.True or false: a ramp is a wheel and axle. (a) True (b) False
30. 30.⚖️ 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) True (b) False
31. 31.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a spoon lifting a lid (c) a doorknob (d) a slide
32. 32.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
33. 33.True or false: a well pulley is a wheel and axle. (a) True (b) False
34. 34.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) bigger on the left (d) zero
35. 35.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
36. 36.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a magnet (d) a flat table
38. 38.⚖️ 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 number of coins (c) distance from the pencil (d) where the pencil is
39. 39.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a crowbar (c) a spoon lifting a lid (d) a sloping road
40. 40.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True

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