Presentation on theme: "Force Chapter 4 (Ewen et al. 2005) Objectives: Related force and the law of inertia. Apply the law of acceleration."— Presentation transcript:
Force Chapter 4 (Ewen et al. 2005) Objectives: Related force and the law of inertia. Apply the law of acceleration.
What causes an object to accelerate? Answer: forces Force is any push or pull Forces, when unbalanced, change the motion of an object. When balanced, motion stays constant.
Newton (N) in the SI system Pounds (lb) in the English system 4.45 N = 1 lb
Newton discovered three relationships or laws between forces and motion. Law of inertia: Newton’s first law Law of acceleration: Newton’s second law Law of action and reaction: Newton’s third law
An object in motion continues that motion with the same velocity, and a body a rest continues at rest unless an unbalance force acts on it.
The property of a body that causes it to remain at rest if at rest or to continue moving with a constant velocity. It is an object’s resistance to a change in motion. Inertia is directly related to mass of an object. More mass, more inertia Units for mass: kilogram (SI), slug (US) 1kg = 0.0685 slug
Relates the applied force, the mass, and the acceleration of an object. It states that Acceleration is directly proportional to force And, inversely proportional to mass. Units for force 1 N = 1 kg m/s 2 1 lb = 1 slug ft/s 2
What force is necessary to produce an acceleration of 6.00 m/s 2 on a mass of 5.00kg?
What force is necessary to produce an acceleration of 2.00 ft/s 2 on a mass of 3.00 slugs?
Find the acceleration produced by a force of 500 N applied to a mass of 20.0 kg.