Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 216 · 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.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) harder (d) easier
2. 2.⚙️ Which simple machine is a tap handle? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
3. 3.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) a magnet (d) coins of one kind
4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a round pencil (c) a flat table (d) a 30 cm ruler
5. 5.True or false: a flat table is needed for the ruler lever. (a) True (b) False
6. 6.True or false: a steering wheel is a wheel and axle. (a) False (b) True
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 3 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?
8. 8.⚙️ Which of these is an inclined plane? (a) a crane (b) a ramp (c) a doorknob (d) a crowbar
9. 9.⚖️ 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 number of coins (b) distance from the pencil (c) the kind of coins (d) which side goes down
10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
11. 11.⚙️ Which simple machine is a ramp? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
12. 12.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
13. 13.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a flat table (c) coins of one kind (d) a round pencil
14. 14.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
15. 15.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
16. 16.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) jump up and down (c) sit farther from middle (d) sit closer to middle
17. 17.⚖️ 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 keep it the same (b) we change it (c) we measure it
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
19. 19.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a 30 cm ruler (c) a battery cell (d) a magnet
20. 20.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
21. 21.⚙️ Which simple machine is a bottle opener? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
22. 22.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
23. 23.⚖️ 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) False (b) True
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) distance from the pencil (b) the kind of coins (c) which side goes down
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
27. 27.🔮 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
28. 28.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 8 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
30. 30.⚙️ Which simple machine is a see-saw? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
31. 31.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a spoon lifting a lid (c) a crowbar (d) a ramp
32. 32.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a crane (c) a ramp (d) a crowbar
33. 33.True or false: a balloon is needed for the ruler lever. (a) False (b) True
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 2 cm to the right to balance it?
35. 35.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is magnetic (c) a lever boosts your push (d) the spoon is hot
36. 36.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
37. 37.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) zero (d) bigger on the left
38. 38.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a magnet (c) a 30 cm ruler (d) a flat table
39. 39.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a slide (c) a well pulley (d) a flagpole
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a mirror (d) coins of one kind

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