 Calculate the acceleration that this object experiences 30 kg 150 N

Newton’s 2 nd Law (N2L) When F net = 0, acceleration = 0 The object is in equilibrium All forces acting on the object are balanced

 If an object dropped on Earth were able to fall without any air resistance, it would accelerate at a rate of g = 9.8 m/s 2  The only force acting on the object would be gravitational force Therefore, according to N2L F net = F W = ma Since Earth’s gravitational acceleration is a constant it has its own variable, g Therefore, F W = mg = m(9.8 m/s 2 ) Remember: weight ≠ mass!!!

 Since mass is used to calculate weight, mass and weight can never be equal. › Weight is dependent on location (on Earth, on the Moon, in space, etc) › Mass only depends on the amount of matter  Your mass would be the same on Earth or on the moon

 Mass is a scalar (same amount no matter where you are) › measured in kilograms  Weight is a force (the force of gravity pulling on an object) and a vector › Weight is measured in Newtons

All things fall to Earth with the same acceleration = g So, F W = mg Why don’t things appear to fall at the same rate?? Air Resistance The air must be moved out of the way in order for an object to move through it.

 Air density- more particles to move out of the way  Speed of the object- particles must be moved out of the way faster  Surface area of the object- more particles must be displaced at once.

Terminal velocity – highest speed reached while falling on Earth › Occurs when F w = F air › F air increases as your speed increases until it equals F w › When F w = F air the object is in equilibrium

1. One kilogram weights 2.2 pounds. Determine your mass using this as a conversion factor 2. Use your mass to calculate your weight