حركة في خط مستقيم

Movement in a Straight Line

• Movement is described as one-directional, which can be straight, curved, or both.
• The speed of an object is equal to the distance covered in a time of 1 second, 1 minute, or 1 hour.
• Uniform motion is when the average speed is equal to the instantaneous speed.
• Speed multiplied by time equals distance.
• Distance and time are two factors describing an object's motion.
• Units of speed are m/s and km/h.
• Relative speed of a moving object compared to a stationary observer is the same as the actual speed.
• Relative speed of a moving object compared to a moving observer moving in the same direction and at the same speed is zero.
• Relative speed of a moving object compared to a moving observer moving in the opposite direction and at the same speed is twice the actual speed.

Calculating Speed

• Speed = Distance / Time
• Average speed = Total distance / Total time
• Relative speed changes depending on the observer's motion.
• If the observer is stationary, relative speed equals actual speed.
• If the observer is moving in the opposite direction, relative speed = actual speed + observer's speed.
• If the observer is moving in the same direction, relative speed = actual speed - observer's speed.
• If the observer is moving in the same direction and at the same speed, relative speed = 0.

Graphing Motion

• Graphing distance against time for uniform motion shows a straight line with a positive slope passing through the origin.
• Graphing speed against time for uniform motion shows a horizontal line parallel to the time axis.
• The rate of change of distance is speed, and the rate of change of speed is acceleration.
• Units of speed are m/s; units of acceleration are m/s².
• Initial speed is zero when an object starts from rest and moves with uniform positive acceleration.
• Final speed (v₂) is greater than initial speed (v₁) when an object moves with positive acceleration.
• An object moving with negative acceleration means its speed decreases over time.
• Uniform motion means zero acceleration.
• Final speed of an object moving from rest with uniform acceleration is determined by the equation v₂ = u + at.
• Uniform acceleration means an object's speed increases by equal amounts in equal time intervals.
• Zero acceleration means an object has uniform motion.
• The ratio of final speed to initial speed for an object with negative acceleration is less than 1.

Acceleration

• Acceleration = Change in speed / Time
• Acceleration is the rate of change in speed.
• Uniform acceleration is when an object's speed changes by equal amounts in equal time intervals.
• Positive acceleration means increasing speed.
• Negative acceleration means decreasing speed.

يتناول هذا الاختبار مفاهيم الحركة في خط مستقيم، بما في ذلك السرعة والمسافة والوقت. سيساعدك على فهم كيف تتعلق هذه المفاهيم ببعضها البعض، وأهمية السرعة النسبية. كما سيتم اختبار معرفتك عن كيفية حساب السرعة والسرعة المتوسطة.