4
א - הגופים מתנגשים על משטח אופקי וחלק. בזמן ההתנגשות תנועת הגופים מושפעת רק מכוחות פנימיים.
לכן בזמן ההתנגשות התנע נשמר.
נכתוב את משוואת שימור התנע ונחשב מהמשוואה את מהירות הגופים U .
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ב - מהירות הגופים לאחר ההתנגשות היא חיובית, ניתן לקבוע שהגופים נעים לאחר ההתנגשות בכיוון הציר, ימינה.
ג - נחשב את גודל המתקף שהפעיל גוף 1 על גוף 2 בעזרת משפט התנע מתקף.
המתקף שהפעיל גוף 1 על גוף 2 שווה לשינוי בתנע של גוף 2:
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ד. נחשב את גודל המתקף שהפעיל גוף 2 על גוף 1 בעזרת משפט התנע מתקף.
המתקף שהפעיל גוף 2 על גוף 1 שווה לשינוי בתנע של גוף 1:
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לפי חוק ניוטון השלישי המתקף שהפעיל גוף 2 על גוף 1 שווה למתקף שהפעיל גוף 1 על גוף 2 אך הפוך לו בכיוונו.
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המתקף שהפעיל גוף 2 על גוף 1 הוא שלילי כיוון שגוף 2 מפעיל על גוף 1 בכיוון ההפוך לכיוון הציר.