PHY101 Assignment

Orange monkey team

phy101 Assignment No.01SolutionFall2021

Q1. The driver of a 2.0 × 103 kg red car traveling on the highway at 45m/s slams on his brakes to avoid striking a second yellow car in front of him, which had come to rest because of blocking ahead as shown in above Fig. After the brakes are applied, a constant friction force of 7.5 × 103 N acts on the car. Ignore air resistance.

1. Determine the least distance should the brakes be applied to avoid a collision

with the other vehicle? (b) If the distance between the vehicles is initially only 40.0 m, at what speed would the collision occur? (c) Write your conclusive observations on the result obtained from this numerical. I.e. the importance of Physics in daily life.

Solution

2.0 10

7.5 10 Given data in this Question mass of thecar is kg velocity of the car is u m s final velocity v Friction force is kg Questions force fr k k a Determine the least distance should the brakes be applied to avoid a collision with the other vehicle Determine the least distance s d solve we need accelration now F N mg friction Nor

0 ) mal force in opposite direction F

9. 8 7.5

.5 9.8

73. 5

n fr k k F mg m mg a g g and a a

(1) using eq(1) value find out and putting value 0=(45) 2( 10 ) 2( 10 ) (45) 73.5

S

1. 01 7 .5

Newton rd law v u as eq by s s m 40.0 ,

would the occure with velocity=40.0 m ?

V i b If the distance between the vehicles is initially only m at what speed would the collision occur What speed u ms

2013.

V m s Newton rd law v u as v v

Q2. Consider an automobile moving at v mph that skids d feet after its brakes lock. Calculate how far it would skid if it was moving at 2v and the brakes were locked.

Solution

per hour) per hour

1. 44704

i

i V V mph mph mile Convert mile V m s feet feet into meters s=0.30480 v v

1. 44704 2 (0.30480)
2. 1998 2(0.30480)( )
3. 1998

2(0.30480)

1. 3278

f i s d Convert

as a a a

a 2v then find the skid distance v -v 0.3278

1. 3278
2. 101

f i velocity is

as s s

s