Q1) Mohammed is standing on a moving wakway in an airport.The walk way is moving at a steady velocity of 1.5m/s.
a)Mohd. starts to walk forwards with a velocity2m/s.what is his resultant velocity?
b)Mohd. then realises that he is walking the wrong way andturns around and runs back woth a velocity3.4m/s.what is his new resultant velocity?
Q2)Two people are pushing a disabled car. One exerts a force of 200 N east, the other a force of 150 N east. What is the net force exerted on the car? (Assume friction to be negligible.)
3)Two soccer players kick a ball simultaneously
from opposite sides. Red #3 kicks with 50 N of force while Blue #5 kicks
with 63 N of force. What is the net force on the ball?
Q4) An airplane heads due north at 100 m/s through a 30 m/s cross wind
blowing from the east to the west. Determine the resultant velocity of
the airplane (relative to due north). 5) A man tries to row diretly across a river.He rows at a velocity of 3m/s. The river has a velocity 4m/s parallel to the banks.calculate the resultant velocity of the boat.
6) Two forces are of magnitude450N and 240n respectively.Determine
a) maximum magnitude of resultant forces
b)minimum magnitude of resultant forces
c)The resultant force when the forces act right angles to each other
Q7) A swimmer who can swim in still water at a speed of 4km/h is swimming in a river.The river flows at a speed of 3km/h. Calculate the speed of the swimmer relative to the bank when he swims
a) upstream
b) down stream
c) directly across the river.
RESOLUTION OF VECTORS
Resolution of vectors means splitting/resolving a vector in to two perpendicular components .
It is the reverse process of finding resultant .
Horizontal component = F cos θ
Vertical Component = F Sin θ where θ is the
angle the vector F makes with the horizontal
direction
Q8)A javelin is thrown with a velocity 20m/s at an angle of 45˚ to the horizontal.
a) What is the vertical component of this velocity?
b)What is the horizontal component of this velocity?
Q9) a ball is kicked with a force of 120N at 25˚
to the horizontal .
a) What is the vertical component of this force?
b)What is the horizontal component of this force?
Please help me with this question.
ReplyDeleteIn soccer practice Thato runs 74m in a direction of W30°S, he turns around and walks 22m in a direction of 30° North of East. Graphically determin the resultant displacement of Thato by means of addition of vectora