F2 - SEM2 - Force and motion - 11.3 Gravity Flashcards
T or F
Magnetic force is a contact force
False
Magnetic force is a non-contact force
T or F
Gravity is a non-contact force
True
Gravity is a non-contact force
Fill in the blank
The force of gravity exerted by ________ pull object towards ________
The force of gravity exerted by “the Earth” pull object towards “the centre of the Earth”
How to draw the force of gravity acting on an object?
draw from the object’s centre and points downwards or towards the Earth’s cenre
T or F
Force of gravity only pull object to Earth
False
Force of gravity exists between any two objects
The force of gravity exists between any two objects. Why do you and the book not stick together?
The force of gravity between two objects increase with their mass.
Your mass and the book’s mass are too small therefore the force of gravity between you and the book is unnoticeable.
T or F
The greater the mass of an object, smaller the force of gravity act on it
False
The greater the mass of an object, greater the force of gravity act on it
What is Free fall?
An object falls freely under the influence of gravity only
T or F
Free fall is non-uniform motion
True
Free fall is non-uniform motion
What are the differences between mass of an object and weight of an object?
Mass of an object - amount of matter in the object, measured in kilogram (kg) / gram (g)
Weight of an object - the force of gravity acting on the object, measured in newton (N)
T or F
Weight of an object is always the same but the mass of the object may be different in different locations in space.
False
Mass of an object is always the same - object has same amount of matter
Weight of the object may be different in different locations in space - Moon has a smaller mass than Earth therefore the force of gravity acting on the object (weight) on Moon is smaller than on Earth
For 1-kg mass, what is the weight on Earth and on Moon?
Earth - 10 N
Moon - 1.6 N
