2 Vocabulary Force- A push or pull that acts on an object. Newton- The force that causes 1-kg mass to accelerate at a rate of 1 meter per second each second.(1m/s)2Net Force- The overall force acting on an objectafter all the forces are combined.Friction- A force that opposes the motion of objects that touchAs they move past each other.
3 Static friction- The friction force that acts on objects that are not moving.Sliding friction- A force that opposes the direction ofmotion of an object as it slides over a surface.Rolling friction- the friction force that acts on a rolling object.Fluid friction- opposes the motion of an object through afluid.Air resistance- fluid friction acting on an objectmoving through the air.
4 Gravity- A force that acts between any two masses. Terminal velocity- The constant velocity of a falling objectWhen the force of air resistance equals the force of gravity.Projectile motion- The motion of a falling object after it isgiven an initial forward velocity.Inertia- The tendency of an object to resist a changeIn its motion.Mass- A measure of the inertia of an object.
5 Momentum- The product of an objects mass and its velocity. Law of conservation of Momentum- If no net force act ona system, then the total momentum doesn't changeGravatational force- An attractive force that acts betweenThat acts between any two masses.inertia mass- determined by how much the objectsresists accelerateImpulse- A change in momentumGravitational mass- A measurement of how much gravityan object exerts on other objects.
6 Weight- The force of gravity acting on an object. Weak nuclear force- an attractive force that acts onlyover a short range.Strong nuclear force- A powerful force of attraction that actsonly on the neutrons and protons in the nucleus.Centripetal force- A force that makes a body followa curved path.Electromagnetic force- Acts between charged particals and isthe combination between all electrical and magnetic forces.
7 25 KEY FACTS The stronger the force, the grater the change in motion Isaac Newton was one of the first scientist to study gravity and forces; he also made the 3 laws of motion.The first law says that any object in motion will continue to move in the direction and speed unless forces act on it.The second law states that the greater the mass of an object, the more force it will take to accelerate the object .The third law states that for every action, there is an equal and opposite reaction.
8 6. Forces can speed and slow things own or completely stop them. 7 6. Forces can speed and slow things own or completely stop them . 7. Gravity keeps Earth and the other planets in our solar system to orbit around the sun. 8. Unlike force, Gravity has no duality; it only attracts and nuclear repels. 9. Friction often makes things hot. As a sliding object is slowed down, much of the energy of its momentum is turned into heat. 10. The two factors that affect resistance is size and shape. 11. You have more momentum when your doing more of something. 12. Air resistance is the reason objects have a terms all velocity. 13. Motion is the changing of position and location. 14. Motion requires a force to cause its change. 15. Force is measured in Newtons.
9 16. Balenced forces are forces that combined to produce a net force of zero. 17. When an unbalanced force acts on an object, the object accelerates. 18. There are 4 main types of friction; sliding friction, static friction, rolling friction, and fluid friction. 19. The greater force between two forces acting on an object will make that object accelerate in that direction. 20. Forces can make things change shape. For example if you squeez or kick a football, it will 21. You can measure force in Newtons. 22. Forces usually act in pairs. 23. To find the force you use the formula (F = M•A) 24. Two things of different masses will accelerate at 9.8 m/s If on earth. On other planets the acceleration iwill be different. 25.Two natural forces that we have experienced are the force of gravity and magnetic force.