12. When a head-on collision occurs between two cars, it is often said that occupants who do not wear their seat belts may be "thrown forward." Reword the statement to better use Newton's first law of motion. [Appendix A] 13. A large truck collides head-on with a compact car. The truck exerts a force on the car to crush its bumper and the small car exerts a force on the truck to crush its bumper. Identify which force, if any, is larger. Explain. [Appendix A] 14. List the four fundamental forces. [Appendix A] frod Use the information below to answer questions 15-16. When calculating weight on or near the Earth's surface, we typically multiply mass by the acceleration due to gravity (9.81 m/s). If the object is stationary, however, it may be written as 9.81 N/kg and is often called gravitational field strength. Using the units N/kg expresses the force acting on a mass while the units m/s express the acceleration of an object. 15. Determine the weight (i.e., force due to gravity) for a 65.0 kg person on the surface of the following planets: Planet a. Earth Gravitational field strength (N/kg) Weight (N) 9.81 b. Jupiter 22.88 C. Mars 3.72 d. Moon 1.62 the force eq 16. A 51.5 kg man has a weight of 504 N in an airplane flying at a high altitude. Determine the value of g (acceleration due to gravity) at his location. [9.79 N/kg]