Motion and momentum GapFill

Distance is how far an object moves, and does not take into account direction.  MassMomentumAccelerationVelocityDisplacementInertia is how far away from a starting position an object has travelled, and in which direction; it is a vector. Similarly,  massmomentumdisplacementinertiavelocityacceleration is the speed of an object, taking into account the direction of travel; this is also a vector.
 MassInertiaAccelerationMomentumVelocityDisplacement is another vector, and describes the rate at which an object speeds up or slows down.

Newton's laws describe how forces affect motion.
Newton's first law states that if an object has no forces acting on it, it will  slow downrotateremain at the same velocitybe stationaryfall to Earthspeed up.
Newton's second law can be stated by the equation  force = mass ÷ velocityforce = mass × acceleration²force = mass × accelerationforce = mass × velocityforce = mass ÷ accelerationforce = ½ mass × velocity².
Newton's third law states that when two objects interact,  they exert forces in the same directionone exerts a larger force on the othera non-contact force is producedfriction causes them to heat upthey each exert opposite and equal forces on the otherthey eventually come to a stop.
 VelocityDisplacementMomentumInertiaForceWeight is an object's resistance to acceleration.

Forces are very important when discussing vehicle safety. The distance that a vehicle travels before coming to a stop is called its stopping distance, which is equal to  thinking distance - braking distancethinking distance ÷ braking distancebraking distance ÷ thinking distancebraking distance - thinking distancebraking distance × thinking distancethinking distance + braking distance. Thinking distance is the distance travelled by a vehicle before the driver reacts to a hazard or other signal. Braking distance is the distance travelled by a vehicle while its brakes are applied, before it comes to a complete stop.
Thinking distance and reaction time can be affected by factors such as  distractions, alcohol or tirednessroad quality, car size or alcoholroad or brake qualityroad conditions, car speed or worn tyresage, alcohol or road qualitytiredness, car weight or weather. Braking distance can be affected by factors such as  tiredness, car weight or weatherdistractions, car speed or worn tyresage, alcohol or road qualitydistractions, alcohol, tiredness or car speedthe weather, car speed, or quality of brakes and tyresroad quality, car size or alcohol.