A1- kinematics

Question 1

what is kinematics

Answer 1

the study of the motion of bodies travelling through time and space without consideration to forces. This can be described in terms of position, velocity, and acceleration

Question 2

what is displacement?

Answer 2

the vector quantity of change in position, measured in mm, cm, or m.

Question 3

what is velocity?

Answer 3

• rate of change of position.
• v=displacement/time
  -can be average or instantaneous

Question 4

what is acceleration?

Answer 4

• rate of change of velocity
• a=change in v/time
• can be an average or instantaneous value

Question 5

what are the conditions for using equations of motion?

Answer 5

1. motion must be in a straight line
2. acceleration must be constant

Question 6

how can vectors be used in calculations more easily?

Answer 6

must be resolved into horizontal/vertical components by using trig/pythag.

these separate components can then be used in calculations as the horizontal and vertical components have no effect on each other- they are perpendicular.

e.g. can be added up/subtracted to find resultant force

Question 7

what is fluid resistance?

Answer 7

opposition to motion through contact with fluid

Question 8

what is terminal velocity?

Answer 8

there is no resultant force (AR and W are balanced) so velocity is constant.

Question 9

what is equilibrium?

Answer 9

forces are balanced therefore no resultant force, and so there is no change in motion.

Question 10

how does a flight path change due to fluid resistance?

Answer 10

• lower maximum height
• lower range
• shape not parabolic- a steeper fall
• time taken decreases