physic s. think back to gcse 1.write down the definition of velocity speed in a given direction...
TRANSCRIPT
PHYSICS
Think back to GCSE
1.Write down the definition of velocitySpeed in a given direction
2.Write down the calculation for velocityBut that is how you calculate speed,
which you just said is different to velocity
Monday 10 April 2023
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.
Distance (x)Displacement (s)
Velocity (v) = Displacement (s)Time (t)
Speed (v) = Distance (x) Time (t)
Scalar Vector
Magnitude
Direction
Magnitude
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
• Velocity
• Acceleration
• Momentum
• Force
• Displacement
• Electric field strength
• Time
• Distance
• Speed
• Temperature
• Mass
• Power
• Energy
Vectors Scalars
Vector Addition
• Is not like ordinary arithmetic • You have to take account of the direction• Two ways to do it
– Scale drawing– Trigonometry
H O
A
Fy
Fx
F
= Fcos
= Fsin