Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 279 · 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 an inclined plane? (a) a well pulley (b) a doorknob (c) a ramp (d) a crane
2. 2.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
3. 3.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they may swallow them (d) they are too shiny
4. 4.⚙️ Which of these uses a pulley? (a) a ramp (b) a steering wheel (c) a tap handle (d) a flagpole
5. 5.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) stand on the ruler (d) bend it till it snaps
6. 6.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the axle (c) the effort (d) the load
7. 7.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit farther from middle (c) sit closer to middle (d) sit on the middle
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) both go up (b) neither, it balances (c) the left side (d) the right side
9. 9.⚖️ 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
10. 10.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) coins of one kind (d) a battery cell
11. 11.True or false: a doorknob is an inclined plane. (a) True (b) False
12. 12.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
13. 13.⚖️ 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 number of coins (b) the kind of coins (c) where the pencil is (d) which side goes down
14. 14.⚖️ 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) a lever boosts your push (d) the spoon is hot
15. 15.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
16. 16.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
17. 17.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) True (b) False
18. 18.⚖️ 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 1 cm to the right to balance it?
19. 19.⚙️ Which of these is a lever? (a) a flagpole (b) a ramp (c) a bottle opener (d) a steering wheel
20. 20.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
21. 21.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
22. 22.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a balloon (c) a magnet (d) a 30 cm ruler
23. 23.True or false: a slide is an inclined plane. (a) False (b) True
24. 24.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
25. 25.True or false: a see-saw is a lever. (a) True (b) False
26. 26.True or false: a balloon is needed for the ruler lever. (a) False (b) True
27. 27.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a slide (c) a spoon lifting a lid (d) a bottle opener
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 8 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
29. 29.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
30. 30.True or false: a steering wheel is a wheel and axle. (a) True (b) False
31. 31.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
32. 32.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
33. 33.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
35. 35.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
36. 36.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
37. 37.⚖️ 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
38. 38.⚖️ 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 number of coins (b) distance from the pencil (c) which side goes down
39. 39.⚖️ 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
40. 40.⚖️ 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

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