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WorksheetsYazied 7 Science ( k) unit #1 lesson #2 ( Gravity & friction
Total questions: 41
Worksheet time: 29mins
The force of attraction between objects due to their masses
(a)
Gravity is a --------------- force !
contact
noncontact
The amount of matter in an object !
(a)
A measure of the pull of gravity on that mass .
(a)
Weight is a force !
true
false
An object's -------------- is constant !
mass
weight
----------------- changes due to the change in the force of gravity !
weight
mass
Mass and weight are measured using the same unit .
true
false
Which of the following statements is TRUE ??
the pull of objects toward Earth is the only gravitational force on Earth .
The gravitational force exerted on you is equal to the gravitational force you exert on Earth
Gravitational force on Earth and the moon has equal effect on objects .
Every object exerts a gravitational force on every other object .
The surface gravity of the moon is --------of Earth !
(a)
Objects near Earth's surface are attracted toward Earth's -------------------
(a)
A force that every mass exerts on every other mass !
(a)
The strength of a force between two objects depends on the -------------of the objects and the ------------------between them .
(a)
Mass and Weight are the same.
TRUE
FALSE
A person would weigh less on on the Moon than on the Earth because . . .
Moon has more mass, and therefore less gravity
Moon has more mass, and therefore more gravity
Moon has less mass, and therefore more gravity
Moon has less mass and therefore less gravity
Two factors affecting gravity.
(a)
Objects with more mass produce a stronger force of gravity than objects with less mass.
True
False
CAUSE: The Distance between two objects increase.
Effect: The force of gravity between them increase.
Effect: The force of gravity between them decrease.
As mass increases, what happens to the gravitational force?
It increases.
It decreases.
It stays the same.
It acts as a 3rd degree derivative function.
As the distance between 2 objects increases, what happens to gravitational force?
It increases.
It decreases.
It stays the same.
A contact force that resists motion between two objects !
(a)
the resistance you feel when you push an object across the floor !
(a)
A smooth surface produces less friction than a rough one !
true
false
Frictional force depends on ____
surface area in contact
roughness of surface
both a and b
none of the above
The rouugher the surface, the faster an object will travel over the surface
true
false
Rough surfaces have _________
greater friction
less friction
the same level of friction
Earth's gravity acts downwards towards the center of the Earth .
true
false
The gravitational force between Earth and Moon results in --------------------------and -------------------------
(a)
A curved path tat objects take around planets , stars or moon .
(a)
Objects near the Earth's surface are attracted towards -----------------
(a)
Friction opposes motion !
true
false
The direction of force of friction is always _____ to the direction of motion
same
opposite
unchanged
none of these
Without friction, an object in motion would never stop.
true
false
The force that opposes the motion of objects through air !
(a)
Is friction between a moving object and the air around the object !
(a)
The number of of air molecules in a given volume !
(a)
To slow down the fall of an object , you want to -----------the air resistance !
decrease
increase
Removing air to create a vacuum , like in space , ----------------------------- the amount of air resistance acting on a monving object !
decreases
increases
The more air resistance there is , the more faster the object will fall !
true
false
the amount of air resistance acting on an object depends on ------------ ,----------------------- and the ----------- of the object and the -----------------------------------of air
(a)
