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week 25 session 3
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  • The first answer in the multiple choice question must be the correct answer.

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true or false:The moon stay in fixed orbit around Earth due to the gravity between them.
true
true or false:Gravity affects only on the moving objects but doesn't affect the objects at rest.
false
true or false: Small planets have bigger gravity than big planet
false
true or false: Planets revolve around the Sun in fixed orbits due to the effect of gravity.
true
true or false: Gravity is attraction or repulsion force between two objects.
false
true or false: After leaving a squeezed spring, it has no force to return back to its original state.
false
true or false: Gravity Is similar to magnetism because both of them has only pulling force.
false
true or false: The force of magnet is always attraction force only.
false
true or false: Magnet has an invisible force called magnetism.
true
true or false: The change of an object position is called force.
false
true or false: Force is the reason of motion of any body
true
true or false: Magnet must touch objects to attract them.
false
The pulling force that causes object to fall down toward Earth's surface.
Gravity of Earth
The force that is found between two magnets or between the magnet and an object.
Magnetism
The change of an object position related to another object.
Motion
The effect that pull or push an object to make it move.
Force
The force of attraction that changes the direction of a moving object in air towards the ground.
Gravity
Give reasons for : Gravity of Earth Is greater than gravity of the moon.
Because the mass of Earth is greater than the mass of the moon
Give reasons for : The ball changes its direction after we throw it upwards.
Because gravity force always pull it downwards.
Give reasons for : Paper clips are pulled toward the magnet
Due to the force of magnetism
What happens if ... There is no gravity on Earth.
AII objects on its surface will float off into space
What happens if ... You squeeze a spring then leave it free.
The spring will be pushed back when you leave it free
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