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Chapters 3 and 4 by Mind Map: Chapters 3 and 4
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Chapters 3 and 4


rate of change of motion; change in velocity, m/s^2

a = change in velocity / change in time

9.8 m/s^2 in free fall

mass is indirectly proportionate; mass can be defined as amount of resistance to change in motion

F = ma is definition of acceleration; F is in Newtons and a is m/s^2

Newton's 2nd Law

Force vector = mass scalar * acceleration vector


avg v = displacement / time

instantaneous velocity: at a given moment, speed as time approaches 0

mass is not a factor

Position and Displacement

position needs origin, not always directional

displacement is vector, change in position

can be found using vectors and x and y components

Words of the Day


Modus Operandi

Ne Plus Ultra



Red Herring


1-D Motion

v(f) = v(0) + at

x = x(0) + v(0)t + 0.5at^2

v^2 = v(0)^2 + 2a(x(f) - x(0))

Examples: free fall, car moving in x or y direction only


Acceleration graphs

above x-axis is acceleration increasing, below is decreasing acceleration

Velocity graphs

parabolic identifies movement; open down is -a and open up is +a

2-D Motion

same equations as for 1-D, but with velocity and position for x and y separately

for y, a always is 9.8 m/s^2

Examples: catapault, kicking a soccer ball