What is the resultant force and the direction of the object?
R = 0 Newton ; Forces are balanced = the object is not moving
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15
What is the formula of moment of a force? State the unit.
moment = Force x perpendicular distance from the pivot ; unit = Nm
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15
What is the resultant force and the direction of the object?
R = 7-5 = 2 N ; downward
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15
What is the formula of weight? State the unit of weight.
Weight = mass x gravity (the unit is in Newton)
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15
Mention 3 vectors quantity.
weight, force, moment
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20
The gravitational field strength of Venus is 8.9 N/kg. An astronaut weighs 1200 N on the Earth. What will his weight be on the Venus?
Weight on the Venus = (1200 / 10) x 8.9 = 1068 N
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10
A force that impedes motion/it acts in the opposite direction to motion is called ....
friction
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baam
Lose 25 points!
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rocket
Go to first place!
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shark
Other team loses 20 points!
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lifesaver
Give 25 points!
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20
Calculate the mass of the object if the density is 3.5 g/mL.
mass = density x Volume = 3.5 x (22-16) = 21 g
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15
What is the density formula and state the SI unit.
density = mass / Volume ; SI unit = kg/m3
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10
The turning effect is measured by a physical quantity known as .....
moment of a force
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20
Why is oil and water cannot be mixed? And the position of the oil always on top than position of the water.
Because water and oil have the different density. The density of water is greater than the density of oil, so oil it will float.
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trap
No points!
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gift
Win 25 points!
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shark
Other team loses 20 points!
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thief
Give points!
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20
Explain why the object of cork is float but the lead is sink?
The cork float because the density of cork is lower than the density of water ; The lead sink because the density of lead is higher than the density of water.
