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KHTN 6 - ÔN TẬP HKI
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Low tides at ...
2 and 4
High tides at ....
1 and 3
C is ...
the Sun
B is ....
the Moon
A is ...
the Earth
Arun doesn't fall through the chair because the .................... from the chair is equal to his weight.
contact force
.................. is the name given to a cloud of dust and gas in space.
nebula
The force of …………………. caused by an object acts towards the centre of the object.
gravity
The forces that cause tides come from the ………………………….and the …………………..
Moon, Sun
The forces that cause tides are called …………………….....
tidal force
On Earth, a baby of weight 50 N. Calculate the mass.
5 kg
On Earth, a pig of mass 100 kg. Calculate the weight.
1000 N
On Earth, a person of weight 400 N. Calculate the mass.
40 kg
On Earth, a person of mass 60 kg. Calculate the weight.
600 N
……………. is the force of gravity on an object. It is measured in newtons.
weight
……………is the quantity of matter in an object. It is measured in kilograms.
mass