WorksheetsYazied Science chapter 2 Lessons 3&4 +quizzes
Total questions: 38
Worksheet time: 19mins
When two forces act on the same object and have direction , their strength can be added together !
true
false
Combined force can have a bigger effect !
true
false
When two forces act on the same object and have the same direction ,...........................
they lose their effect on the object .
their strengths can be added together and work as one bigger force
their strengths act separately each in different direction
Forces can be combined as long as they act in the same direction .
true
false
Two forces of equal strengths that combined to act on the same object but in opposite directions !
balanced forces
unbalanced forces
gravity
non-contact force
Balanced forces cancel each other
true
false
What is NOT true about balanced forces ?
balanced forces can affect the motion of an object
Force are only balanced when they act oppositely.
Balanced forces cancel each other .
Several forces can be balanced at the same time
The total of the forces acting on a body !
gravity
balanced force
net force
contact force
Two persons are pushing a box towards each other with the same strength! what do you think will happen ?
the box will move towards the who is pushing with greater force .
the box will not move .
The sun is the primary source of light energy for Earth .
true
false
Light energy travels as waves in straight lines , as long as nothing is in its way .
true
false
An area of partial darkness where light has been blocked by an object .
glass
path of light
light
shadow
If you hold your hand close to the wall and shine the flashlight on it ,........................................................
the shadow will be the same size as your hand .
the shadow will be smaller than your hand if you move your hand closer to the flashlight .
there will be no shadow as your hand blocks the light
A shadow appears when the light rays can not reach the wall .
true
false
The closer the light source to the object , ............................
the bigger is the shadow .
the smaller is the shadow .
there will be no shadow .
The angle at which light strikes an object also affects the size of a shadow .
true
false
Your shadow is longer at noon when sun is highest in the sky .
true
false
How does changing the position of a light source affect the size of an object's shadow ?
The further the light source from the object , the smaller the shadow is .
the closer the object to the light source , the smaller the shadow is
the further the object from the light source , the bigger the shadow is .
When light passes through a clear window ,...................
the window will have a big shadow if the light source is near .
the window will have smaller shadow if the light source is further .
the widow will have no shadow as the window is clear and nothing block the light path .
Due to ....................., objects tend to resist changes in motion .
acceleration
inertia
position
mass
Acceleration depends on the object's mass and the force acting on it .
true
false
Every force creates an equal and opposite force !
true
false
Opposite but equal forces !!
unbalanced
combined
balanced
net force
Air resistance is a non- contact force !
true
false
The force of air pushing against a moving object !
friction
air resistance
gravity
water resistance
A resistance force opposing motion!
gravity
friction
electric force
magnet
The property by which an object tends to remain at rest or in uniform straight-line motion !
friction
resistance
attraction
inertia
An object will remain at rest or in uniform motion unless acted on by an unbalanced external force.
Newton's first law
Newton's second law
Newton's third law
A greater force is required to accelerate an object with more mass at the same rate as an object with less mass .
Newton's first law
Newton's second law
Newtons third law .
Newton's third law !!
A greater force is required to accelerate an object with more mass at the same rate as an object with less mass.
For every action there is an equal and opposite reaction.
An object will remain at rest or in uniform motion unless acted on by an unbalanced external force.
A force of attraction between objects that is due to their masses.
magnetism
gravity
friction
contact force
Force equals mass times acceleration !
Newton's first law
Newton's second law
Newton's third law
A fireman turns on his hose & is knocked backwards .
Newton's first law
Newton's second law
Newton's third law
You have to push a heavy ball harder to get it to move as fast as a small one.
Newton's first law
Newton's second law
Newton's third law
Which example of the following explains Newton's first law ?
A soccer ball will not move until a player kicks it.
If air is let out of a balloon quickly, air pushes down & balloon goes up.
It takes less force to push a bike than a motorcycle.
In a plane taking off you feel pushed back into your seat.
Newton's first law
Newton's second law
Newton's third law
What laws of motion are demonstrated by a hammer pounding a nail into a board !
Newton's first law
Newton's second law
Newton's third law
All of the above
Spaceships travels million of miles without using fuel !
At space no force acts on it so there is no acceleration , besides inertia causes it keeps its speed .
force of gravity in space is stronger than that on Earth .
