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Force-c.1300, from O.Fr. force, from L.L. fortia, from neut. pl. of L. fortis "strong"
Physics usage: an amount of push or pull in a direction
Contact forces
Non-contact forces
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Contact forces
-push or pull due to physical contact between two objects
Write a non-sports example of contact force.
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Non-contact forces
-push or pull occurring even though there is no physical contact
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Types of forces:
Gravitational :Non-contact force that pushes objects downward
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Types of forces:
Normal:
Contact force that a surface exerts on an object with which it is in contact (perpendicular)
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Types of forces:
Friction:
Contact force that a surface exerts on an object with which it is in contact (parallel)
Smooth surface=
less friction
Rough surface=
more friction
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Types of forces:
Push/pull:
force that opposes friction push/pull
friction
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Identify the force for the pictures. Why?
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How we calculate force:
F= m x a *units= Newtons (N)
F=force
m=mass
a=acceleration
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Calculate the force for the following
1.An object of mass 3 kg accelerating at 5 m/s2.
2.A ball of 2 kg thrown at an acceleration of 56 m/s2.
3.A sumo wrestler of 30kg being thrown at 4 m/s2.
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If the applied forces are….. …then the net force is.
20 N
10 N
30 N
10 N 25 N15 N
Movement=unbalanced force (force is not zero)
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10 N 10 N
No movement= balanced force (force is zero)
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Balanced or unbalanced? Why?
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Use the current vocabulary to summarize your learning of forces.