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Forces in action (grade 6)
The type of force that occurs in this experiment is upthrust. Upthrust is the force that pushes an object up and makes it seem to lose weight in a fluid. My prediction was correct. The weight of the object measured in water was lower than the weight measured in air, due to the upthrust force of the water pushing up on the object. The more dense the fluid, the greater the upthrust force and the more the object's apparent weight is reduced.
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Forces are pushes or pulls causing motion changes. They are measured in newtons (N). Types include gravity and weight.
Gravity pulls objects down; it varies on the Moon. Mass is in grams; weight is measured in newtons.
Illustrates mass and weight correlation for various objects with numerical data.
Calculates mass and weight with given scenarios. Friction defined as resistance between surfaces.
Discusses air resistance and upthrust in fluids, showing how they counteract weight.
Mass defines matter amount; weight measured by forces due to gravity. Uses a spring balance.
Describes experimental predictions and processes measuring forces in air versus water with example data.
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Forces in action (grade 6)
- 2. In science, force, usually means either a Something that push or a pull cause an object moves, changes its speed, direction and shape.
- 3. C G H D B A E F I J K L
- 4. We cannot seeforces. We can measure them and sometimes feel the effects they have on things. Forces are measured in newtons (N) Some Types of Force Gravity Weight
- 5. The force ofgravity also exists on the Moon but it is not as strong as it is on the Earth. This is because the Moon is much smaller than the Earth.
- 7. Gravity is aforce that pulls objects downwards towards the centre of the earth
- 8. Mass : theamount of matter it contains It is measured in grams (g) or kilograms (kg) but it is NOT a force. Weight : the force caused by gravity pulling down on the mass of an object. It is measured in newtons (N).
- 9. No Objects Mass Weight (g) (N) 1 I 100 1 2 II 200 2 3 III 300 3 4 IV 400 4
- 10. 4.5 4 3.5 3 Weight (N) 2.5 2 1.5 1 0.5 0 100 200 300 400 Mass (g)
- 11. 1. if themass of an object is 560 grams, then how is it weight? 2. if the weight of an object is 5 N, what is the mass of the object?
- 12. Friction is theresistance between two surfaces that are in contact with each other.
- 14. Air resistance pushesagainst things which are moving.
- 15.
- 16. Upthrust isthe force that pushes an object up and makes it seem to lose weight in a fluid. (Remember, a fluid means a liquid or a gas)
- 17. When a forcework on an object, there always another force that work on it from the opposite site. e.g:
- 19. Mass is theamount of matter it contains Weight is the size of the force of the gravity depends on the object’s mass and its distance from the object it’s attracting.
- 20. We measure forcein newtons. We use an instrument called a spring balance known as a force meter or a newton meter.
- 21. I. Aim: Findout the different of force in the air and in the water II. Tools and materials Forcemeter Objects that sink in water (glass, plasticin, metal) water Jar
- 22. I predict thatthe weight of the object in the air will be _(higher than, lower than or equal to) _ the weight of the object in water. If I put more water into the beaker, I predict that the reading on the Newton meter will __(increase, decrease, or not be any different to before)
- 23. Attach an objectto the forcemeter Check the force needed to lift it in the air Put the object on the water in the jar and make sure that its not touch the bottom of the jar Record your data in a table Repeat your measurement for 3 times Do the same thing to other objects
- 24. 1. Plasticine Weight in Weight in the Upthrust on No. the air water object (N) (N) (N) I 4 0.5 4 – 0.5 = 3.5 N II 4 1.5 4 – 1.5 = 2.5 N III 4 1 4–1=3N Average 3N
- 25. 2. Metal Weight in Weight in the Upthrust on No. the air water object (N) (N) (N) I 2 1.5 2 – 1.5 = 0.5 N II 2 1.7 2 – 1.7 = 0.3 N III 2 1.7 2 – 1.7 = 0.3 N Average 0.37 N
- 26. Is there anydifferent when you measure the weight in the air and in the water?_____ Tell the difference___________ What type of force that occurs in this experiment?