force. a push or a pull a force gives energy to an object causing it to… –start moving, stop...
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Force
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• a push or a pull• a force gives energy to an object causing it to…– start moving, stop moving, or change direction
• the unit of measurement is Newtons (N)– used to be a kg(m/s2)– this is about ¼ pound
• forces in the same direction are added to make the resulting force stronger
• forces in different directions are subtracted which makes the resulting force weaker– if these forces are equal, they are balanced forces
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Types of Forces• Contact Forces: the objects involved are touching
each other and friction is created– friction is a force that is in the opposite
direction to the moving object and therefore, slows it down
– 3 types of friction• rolling• sliding• fluid – this is caused by an object moving
through a liquid or a gas
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• Non-contact forces: objects are pushed or pulled without being touched– gravity
– electricity
– magnetism
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F = Forcem = massa = acceleration
F = ma or F = m·a or F = m x a or F = m(a)
Force formula
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Two ways an object has force and how to use the force formula
1. Object is accelerating.– if it is rolling, flying, and/or sliding it has a
force– think of a car hitting you
2. Object is NOT moving (more on this later)– this is a result of gravity– think of a car on top of you!
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Example problem• A rocket has a mass of 3.5 kg and an acceleration
of 3.0 m/s2. What is the rocket’s force?
m=3.5kg F=ma a=3.0m/s2
given formula set up problem answer w/ unit of measurement
A kg(m/s2) is the same as a Newton so 10.5 N would be the same, but simpler.
3.5kg(3.0m/s2) 10.5 kg(m/s2)