want to know the secret to the force… youngling, younglings gather round… use equations you must...
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Want to know the secret to the Force…
Youngling, younglings gather
round…Use equations you
must
KL physics2011
![Page 2: Want to know the secret to the Force… Youngling, younglings gather round… Use equations you must KL physics2011](https://reader036.vdocuments.net/reader036/viewer/2022062515/56649c8a5503460f949446e8/html5/thumbnails/2.jpg)
Equations we will use
�⃗�=𝑚�⃗�
𝜏= �⃗� 𝑟Torque
FAlso the idea that Net force = the sum of all of the forces acting on the object
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Units to knowQuantity Symbol Unit
Force Newton (N)
Mass m Kilogram (kg)
Acceleration m/s2
Torque τ Newton meter (Nm)
Lever arm r Meter (m)
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Example 1 – Finding Mass
What is the mass of a 650 N dog?
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Example 2 – Finding Net Force
A rocket engine applies an upward force of 500 N to a small rocket. The rocket has a mass of 35 kg. Find the net force on the rocket.
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Example 3 – Finding acceleration A rocket engine applies an upward force of 500 N to a small rocket. The
rocket has a mass of 35 kg. Find the acceleration of the rocket.
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Whoa there Yoda…What’s TorqueNot every force moves in a straight line, think about using a wrench or opening a
door.
Torque is the effect of a force applied on an object that causes rotation.
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Whoa there Yoda…What’s TorqueTorque is the effect of a force applied on an object that causes rotation.
Lever arm
rFulcrum – center of rotation
Lever arm – distance from fulcrum to the point the force is applied
Direction of rotation – clockwise (cw) or counter –clockwise (ccw)
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Whoa there Yoda…What’s TorqueTorque is the effect of a force applied on an object that causes rotation.
Lever arm
r
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Whoa there Yoda…What’s Torque
The amount of the force and the distance from the axis of rotation determine the torque.
𝜏= �⃗� 𝑟
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Example 4 – Finding Torque
How much force will a technician need to tighten a bolt to 100 Nm if the longest wrench he can find is 0.2m long?
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Use the force…
Armed you are now…Practice you must…
Prepare yourself young Jedi. Yes…you will be tested!