Section 2: Friction & Gravity friction- the force that two surfaces exert on each other when they rub against each other. 4 Types of Friction: (strongest to weakest) 1)Static 2)Sliding 3)Rolling 4)Fluid - air resistance is the most common form.
gravity – a force that pulls objects toward each other. Gravity causes objects to accelerate toward earth at: 9.8 m/s 2.
momentum – the product of an object’s mass and velocity. momentum = (mass)(velocity) p = mv measured in units of: kilogram-meter/second
Law of Conservation of Momentum states that: the total momentum of a group of objects remains constant in other words: the total momentum of objects before a collision equals the total momentum after a collision.
8 1.5 m/s 0.25 kg 0 m/s 0.3 kg C Before the collision p = (0.25 kg)(1.5 m/s)p = (0.3 kg)(0 m/s) p =.38 kgm/s p = 0 kgm/s p t =.38 kgm/s + 0 kgm/s p t = 0.38 kgm/s
After the collision 8 0.25 kg 0.3 kg C 0.75 m/s p = (0.25 kg)(0.75 m/s)p = (0.3 kg)(0.63 m/s) p = 0.19 kgm/s p t = 0.19 kgm/s + 0.19 kgm/s p t = 0.38 kgm/s 0.63 m/s
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