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Published byGabriel Curtis Modified over 5 years ago

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Physics Unit Four Forces that Affect Motion

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Force A push or a pull. Measured in newtons with a spring scale. 1 newton (N) = 1 kg m/s 2 An apple weighs about 1 newton. Calculate your weight in newtons: Weight in pounds = _____ 2.2 lbs/kg Mass in kg = _____ x 9.8m/s 2 = Weight in newtons _____ N

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Forces that affect motion F a Applied Force –a force exerted on an object by other objects in it’s environment. F f Frictional Force – a force that opposes motion between the object and the surface it rests upon F g Gravitational Force – the force of attraction between two objects with mass (ex. Between an object and the Earth, for example) F n Normal Force – the supportive force of the surface an object rests upon. It is equal to the force of gravity acting on the object. Normal means “perpendicular”

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If forces are balanced… No Motion No net (unbalance) forces. FgFg FnFn FfFf FfFf FgFg FnFn

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If forces are balanced… No Motion No net (unbalance) forces. FgFg FnFn FgFg FnFn 50N, up 50N, down

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If forces are unbalanced… Motion Net (unbalanced) force. FgFg FnFn Direction of motion FnFn FgFg

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Force Equations Acceleration –According to Newton’s 2nd Law of motion, the acceleration of an object is equal to the net force acting on it divided by the object’s mass –Formula: A = F / m –Therefore, doubling the mass of an object cuts its acceleration in half –The unit for acceleration is m/s 2

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Force –Force on an object is equal to its mass and acceleration –Formula: F= m(a) Force Equations

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Weight –Weight is the force of gravity acting on an object –Formula: W= m(g) –The unit for weight is also newtons because it is a force Force Equations

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Momentum –Momentum is the product of an object’s mass and its velocity –An object has a large momentum if the product of its mass and velocity is large. –Formula: Momentum ( P)= m(v) –The unit for momentum is kg*m/s Force Equations

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