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PHYSICS

PHYSICS. Think back to GCSE Write down the definition of velocity Speed in a given direction Write down the calculation for velocity But that is how you calculate speed, which you just said is different to velocity. Monday, 08 September 2014. 1.1.2 Scalars and Vectors.

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PHYSICS

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  1. PHYSICS

  2. Think back to GCSE • Write down the definition of velocity • Speed in a given direction • Write down the calculation for velocity • But that is how you calculate speed, which you just said is different to velocity

  3. Monday, 08 September 2014 1.1.2 Scalars and Vectors • Learning Objectives: • Understand the difference between scalars and vectors. • Add and subtract vectors. • Work out the x and y components of a vector.

  4. Distance (x) Displacement (s)

  5. Vector Scalar Speed (v) = Distance (x) Time (t) Velocity (v) = Displacement (s) Time (t) Magnitude Magnitude Direction 

  6. Vectors • Some quantities need to have a direction to be meaningful. • Force for instance can be big or small but we need to know the direction it acts if it is to be useful. • Vectors are quantities that have BOTH a Magnitude and a Direction • We can represent them with ARROWS 10 N Right 10 N Left or -10N

  7. Vectors Scalars • Velocity • Acceleration • Momentum • Force • Displacement • Electric field strength • Time • Distance • Speed • Temperature • Mass • Power • Energy

  8. Vector Addition • Is not like ordinary arithmetic • You have to take account of the direction • Two ways to do it • Scale drawing • Trigonometry

  9. H O  A

  10. = Fsin Fy F  = Fcos Fx

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