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Want to know the secret to the Force… Youngling, younglings gather round… Use equations you must KL physics2011

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Equations we will use Also the idea that Net force = the sum of all of the forces acting on the object

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Units to know QuantitySymbolUnit ForceNewton (N) MassmKilogram (kg) Accelerationm/s 2 TorqueτNewton meter (Nm) Lever armrMeter (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 Torque Not 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 Torque Torque is the effect of a force applied on an object that causes rotation. Lever arm r Fulcrum – 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 Torque Torque 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.

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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!

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