شكل الاختبار التجريبي

مساء النور ياهلاا والله بالنجووم ✨✨

اليوم فيه كويز شامل لكل الأقسام متحمسسين ؟؟ 🤩🤩

يلاا رح نبدأ…

أول قسم معانا القرامر 👇🏻

ثاني قسم الريدنق 👇🏻

قطعة الاحتكاك


1) In general, smooth surfaces produce less friction than rough
surfaces. The strength of the force of friction depends on two
factors: how hard the surfaces push together and the types of
surfaces involved. Friction also increases if surfaces push hard
against each other. If you rub your hands together forcefully, there
is more friction than if you rub your hands together lightly.



(2) Even the smoothest objects have irregular, bumpy Surfaces.
When the irregularities of one surface come into contact with those
of another surface, friction occurs. Friction acts in a direction
opposite to the direction of the object's motion. Without friction, a
moving object might not stop until it strikes another object.
Static Fiction



(3) The friction that acts on objects that are not moving is called
static friction. Because of static friction, you must use extra force
to start the motion of stationary objects. For example, think about
what happens when you try to push a heavy desk across a floor. If
you push on the desk with a force less than the force of static
friction between the desk and the floor, the desk will not move.
Rolling Fiction



(4) When an object rolls across a surface, rolling friction occurs.
This type of friction is important to engineers who design certain
products. For example, skates, skateboards, and bicycles need
wheels that move freely. So engineers use ball bearings to reduce
the friction between the wheels and the rest of the product. These
ball bearings are small, smooth steel balls that reduce friction by
rolling between moving parts.

مخطط بياني عن السفر

قطعة الطبيب المساعد

My uncle Ahmad is a physician. He helps people when they are sick.
When his patients go to the office, he may ask them to breathe
while he listens to their chest. Then he listens to the sound of the
air in their lungs. He may have to ask them many questions and
examine them to see what is making them sick. He helps people
have better health.

مخطط عن وسائل التواصل الاجتماعي