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Kinematics Flashcards

(3 cards)

1
Q

A paraglider P of mass 95 kg is pulled by a wire attached to a boat,
The wire makes an angle of 25° with the horizontal water surface.
Acceleration of P is 1.4 m s^-2.
The tension in the wire at time t = 5.0 s is 280 N.
1. the vertical lift force F supporting P,
2.the force R due to air resistance acting on P in the horizontal direction.

A
  1. F = vertically downwards component of tension + weight
    F = 280sin25 + (95×9.81)
  2. a= 1.4 ms‐²
    Fr = ma = 95 x 1.4
    Fr = Ht(horizontal component of tension) - Fa.r(air resistance opposing the motion)
    133 = 280cos25 - R
    R = 120.8 N
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2
Q

Describe the acceleration of a ball as it freefalls in air until it reaches terminal velocity

A
  1. Initial acceleration is 9.81 ms‐².
  2. Acceleration decreases gradually
  3. Final accn is zero
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3
Q

From time t = 12 s, the velocity of each car remains constant at its value at t = 12 s.
Determine the time t at which car Q passes car P. [Steps no values. Also you have a v-t graph for both cars]

A
  1. Calculate relative speed between the two cars
  2. Find distance between them at t 12s.
  3. Use s = d/t
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