# Physics on the go Mechanics Section 1

This covers Equations of motion, Graphs, Scalar and Vector quantities and Projectiles

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• Created by: Edward
• Created on: 28-12-12 10:55
• Mechanics Section 1
• Scalar
• A quantity that only requires magnitude, no direction
• Examples include mass, temperature, time
• Vector
• A quantity that requires both direction and magnitude
• Examples include acceleration, force, velocity
• Use pythagoras to find resultant force
• Find angle  of the force using either sin or cos
• Inside angle is cos, outside is sin
• Equations of motion
• SUVAT
• V=final velocity (ms^-1)
• U=initial velocity (ms^-1)
• A=acceleration (ms^-2)
• S=displacement (m)
• T=time (s)
• V^2=U^2+2AS
• S=0.5(V+U)T
• A=(V-U)/T
• S=UT+0.5AT^2
• Projectile motion
• At an angle
• Resole horizontally and vertically, use the vertical component to find time and height, use the horizontal component to find out the distance travelled whilst in the air
• Vertical
• Use equations of motion
• Horizontal
• At an angle
• Resole horizontally and vertically, use the vertical component to find time and height, use the horizontal component to find out the distance travelled whilst in the air
• Horizontal
• Free fall
• The motion of an object undergoing the acceleration of gravity
• Gravity=9.81ms^-2
• Displacement-Time graphs
• If graphs is curved it means object is accelerating/ decelerating
• To find velocity draw a tangent
• If linear, velocity is constant
• Using ICT to draw graphs
• Data is more accurate
• Data displayed in real time
• Higher sampling rate than human
• Velocity-Time graphs
• Distance travelled equals area
• Using ICT to draw graphs
• Data is more accurate
• Data displayed in real time
• Higher sampling rate than human