1. Force 2. Net force 3. Balanced forces 4. Unbalanced forces 5. Gravity 6. Friction 7. Inertia 8. Newton’s First Law of Motion a. a resistance to motion that occurs when surfaces are in contact with each other b. an attractive force that all objects exert on each other c. when all the forces acting on an object create a net force of zero, and the object does not move d. the tendency of an object to continue its current motion or lack of motion e. states that an object at rest stays at rest and an object in motion stays in motion at the same speed and in the same direction, unless acted upon by another force f. when all the forces acting on an object create a net force greater than zero, and the object moves g. the sum of all the forces acting on an object h. any push or pull on an objectCHALLENGE! Think about how Newton’s First Law of Motion applies to you. Imagine that you are riding in a car when the driver abruptly steps on the brake. Use Newton’s First Law of Motion and any applicable vocabulary terms from above to explain why your body tends to move forward when this happens.

When the driver abruptly steps on the brake, the car's motion changes rapidly. According to Newton's First Law of Motion, an object at rest tends to stay at rest, and an object in motion tends to stay in motion at the same speed and in the same direction unless acted upon by another force.

In this situation, your body is in motion because the car was moving. When the driver steps on the brake, the car decelerates rapidly, but your body tries to resist this change in motion due to inertia. Your body tends to continue moving forward with the same speed that the car was moving before the braking.

However, the friction between your body and the seatbelt or the car seat provides a force that opposes your forward motion. This friction creates a net force that slows your body down. Although your body may move forward slightly due to inertia, the seatbelt or the car seat exerts a force in the opposite direction to prevent you from being thrown forward. Therefore, the friction and the seatbelt or car seat act as a balanced force to stop your forward motion and keep you restrained in the car.