Dynamics (Forces) 9. Explain using Newton's First Law why car seats have headrests or how the locking mechanism in a seatbelt works. Before coming to After coming to a suiciden shop sudden stop pendulum pure & l No headrest ibj Peace 10. Explain using Newton's Second Law why these three types of vehicles accelerate quickly or slowly. (a) (c) 11. Explain using Newton's Third Law why the cannons on this ship need to be held in place with ropes. Figure 6 shows a photograph of an early naval cannon tied to a ship. Explain why the ropes are necessary