پاورپوینت اموزش علوم نهم قوانین نیوتون / پاورپوینت اموزش علوم نهم قوانین نیوتون
Newton’s law’s Newton’s first law ■ if the resultant force acting on a stationary object is zero then the object will remain stationary. Newton’s first law ■ if the resultant force acting on a moving object is zero then the object will continue moving in the same direction at the same speed