Forces and the Laws of Motion

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Presentation transcript:

Forces and the Laws of Motion Changes in Motion

Force Force – the cause of acceleration, or the change in an object’s velocity Causes objects to speed up, slow down, start motion, stop motion, change direction Force is measured in Newtons (N) 1 Newton equals the amount of force necessary to accelerate a 1kg mass 1m/s2 1N=1kgm/s2 Weight is a force caused by the interaction between gravitational acceleration and an object’s mass

Force

Force Forces can act through contact or at a distance Contact force – force that arises from the physical contact of two objects Field force – force that can exist between objects, even in the absence of physical contact between the objects Gravity, electromagnetic force

Force Diagrams Force diagram – a diagram of the objects involved in a situation and the forces exerted on the objects Draw arrows with the tail of the arrow on the object and the head of the arrow in the direction of the force

Force Diagrams

Force Diagrams