1.
إذا تحرك جسم بسرعة ثابتة وخط مستقيم فيكون تسارعة
Correct Answer
A. صفر
Explanation
If an object is moving at a constant speed in a straight line, its acceleration is zero. This means that the object is not changing its speed or direction. Acceleration is the rate at which an object's velocity changes, and if the velocity is constant, there is no change and therefore no acceleration.
2.
إذا أثرت قوة من الجسم أ على الجسم ب مقدارها 30 نيوتن نحو الشرق فإن ب يؤثر على أ بقوة مقدارها
Correct Answer
C. 30 نيوتن شرقا
Explanation
The question states that if a force of 30 Newtons from object A affects object B towards the east, then object B will affect object A with a force of 30 Newtons towards the east. This means that the force exerted by object B on object A will be equal in magnitude (30 Newtons) and in the same direction (east). Therefore, the correct answer is "30 نيوتن شرقا" (30 Newtons towards the east).
3.
إذا تحرك جسم تحت تاثير قوتين بسرعة ثابتة وفي خط مستقيم وكانت إحدى القوتين 50 نيوتن شرقا والثانية
Correct Answer
B. 50 غربا
Explanation
The correct answer is "50 غربا" because the two forces mentioned in the question are equal in magnitude but opposite in direction. Since they cancel each other out, the net force on the body is zero, resulting in no acceleration or change in velocity. Therefore, the body will continue to move at a constant speed in a straight line.
4.
محصلة الفوى تكون أكبر على الجسم
Correct Answer
D. المتحرك
Explanation
The explanation for the given correct answer is that when an object is moving at a constant speed in a straight line, the net force acting on it is zero. This means that the forces acting in the opposite direction of the motion, such as friction, are equal in magnitude to the forces acting in the direction of motion. Therefore, the net force on the moving object is balanced, resulting in a zero net force. On the other hand, the static object does not have any opposing force to balance the applied force, so the net force on the static object is not zero.
5.
يعتمد القصور الداتي للجسم على
Correct Answer
C. الكتلة
Explanation
The correct answer is "الكتلة" (mass). The inherent limitation of the body depends on its mass, which refers to the amount of matter contained in the object. Mass affects the body's ability to resist changes in motion or acceleration. Objects with larger masses require more force to move or accelerate, while objects with smaller masses can be moved or accelerated more easily. Therefore, the mass of an object is a crucial factor in determining its inertia and the amount of force needed to overcome it.
6.
إذا أثرت قوة على جسم كتلته 2000 كغم فحركته بتسارع 0.05 م/ث 2فإن القوة المؤثرة على الجسم تساوي
Correct Answer
A. 100 نيوتن
Explanation
The force acting on an object can be calculated using the formula F = m × a, where F is the force, m is the mass, and a is the acceleration. In this case, the mass of the object is given as 2000 kg and the acceleration is given as 0.05 m/s^2. Plugging these values into the formula, we get F = 2000 kg × 0.05 m/s^2 = 100 N. Therefore, the force acting on the object is 100 Newtons.
7.
إذا علمت أن كتلة حجر 50 كغم والقوة التي يجر بها الكلب العربة التي تحمل الحجر 100 نيوتن فإن التسارع
Correct Answer
A. 2م/ث
Explanation
The correct answer is 2م/ث. This can be determined using Newton's second law of motion, which states that the acceleration of an object is equal to the net force acting on it divided by its mass. In this case, the net force is 100 N and the mass is 50 kg. Therefore, the acceleration can be calculated as 100 N / 50 kg = 2م/ث.
8.
حينما تضرب الكرة بقدمك فإن قوى الفعل ورد الفعل لا يلغيان بعضهما لأن
Correct Answer
C. القوتين تؤثران في جسمين مختلفين
Explanation
When you kick the ball with your foot, the forces of action and reaction do not cancel each other out because they are acting on different bodies. The force of your foot on the ball is greater than the force of the ball on your foot.
9.
لا يرتد المدفع بالسرعة نفسها التي تنطلق بها القذيفة على الرغم من الفعل ورد الفعل متعاكسان في المقدار لاأن
Correct Answer
C. لأن كتلة القصور لكل منهما مختلفة
Explanation
The correct answer is because the mass of the cannon and the projectile are different.
10.
عندما تتحرك الدراجة إلى الأمام فإن قوة الإحتكاك تكون
Correct Answer
B. للخلف
Explanation
When a bicycle moves forward, the force of friction is directed backward. This is because the friction force always opposes the motion of an object. Therefore, the correct answer is "للخلف" which means "backward" in Arabic.
11.
قوة الاحتكاك المسئولة عن إحداث القوة المركزية التي تجعل السيارة تدور أو تنحنى
Correct Answer
A. قوة الاحتكاك الحركي
Explanation
The correct answer is قوة الاحتكاك الحركي. This is because frictional force is responsible for causing the centripetal force that makes the car rotate or turn. Frictional force acts in the opposite direction to the motion of the car and helps to keep it on the road while turning. The other options mentioned, such as قوة الاحتكاك السكوني (static frictional force) and قوة الاحتكاك الحركي وقوة الاحتكاك السكوني (both kinetic and static frictional forces), are not directly related to causing the centripetal force needed for rotation or bending of the car.
12.
سبب خطورة السير بسرعة كبيرة عند الدوارات والانحناءات في حال كون الشارع مبللا
Correct Answer
B. لأن قوة الاحتكاك الحركي تكون أقل
Explanation
سبب خطورة السير بسرعة كبيرة عند الدوارات والانحناءات في حال كون الشارع مبللا هو أن قوة الاحتكاك الحركي تكون أقل. عندما يكون الشارع مبللاً، يزداد انزلاق الإطارات على السطح المبلل، مما يقلل من قوة الاحتكاك بين الإطارات والطريق. وبسبب السرعة العالية، يصبح من الصعب على السائق السيطرة على المركبة والتوقف في الوقت المناسب، مما يزيد من خطر وقوع حوادث.
13.
إذا انقطع حبل المصعد فإن قراءة الميزان في المصعد
Correct Answer
D. صفر
Explanation
When the elevator cable is cut, the elevator becomes detached from the support and falls freely. During this free fall, there is no contact force between the elevator and the scale, so the reading on the scale will be zero.