CHAPTER 1 STOP AND GO Hannah's dad is driving her to school Suddenly a dog darts in front of the car Hannah's dad slams on the brakes The car comes to a fast stop But Hannah's body keeps moving forward A car comes to a sudden stop when the brakes are pressed hard Un
Fortunately Hannah is wearing her seat belt The seat belt helps stop her motion as the car slows down Without the seat belt Hannah would keep moving forward That’s because all objects tend to keep doing what they are already doing This is called inertia A moving object tends to keep moving Its speed and direction will not change unless a net force acts on the object A net force is the
Wearing a seat belt is important when riding in cars total effect of all forces acting on the object
