No, Friction was not Negligible. If you push a block on a surface, it will not continue to move unless you are still pushing it.
The book continue to move due to its inertia
Explanation:
We can answer this question by using Newton's first law, which states that:
"When an object is moving with constant velocity (or it is at rest), it will continue moving with constant velocity (or will stay at rest) unless acted upon an external unbalanced force".
This law is also known as law of inertia.
If we apply this law to the situation in the problem, we notice that:
- Before the car stops, the book is moving with constant velocity (25 mph) together with the car
- When the car stops, there are no external forces acting on the book, which is free to continue its motion: so, the book will continue moving at 25 mph forward, due to its inertia. The book will be eventually stopped when it hits the floor (because the floor applies an unbalanced force on it).
Learn more about inertia:
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Answer:
100m
Explanation:
100m
s=ut+1/2at^2
s= unknown, u=0, a=2, t=10
s=0*10+1/2(2)(10)^2
s=1/2(2)(100)
s=1(100)
displacement = 100 meters
Answer:
kicking ball and throwing stone
Answer:
13.94 rpm
Explanation:
Given that,
The diameter of the pulley, d = 14 foot
Radius, r = 7 foot
The linear velocity of the pulley, v = 14 mph = 20.53 ft/s
We need to find the angular velocity in rpm.
We know that, the relation between the linear velocity and the angular velocity is as follows :
or
So, the angular velocity of the pulley is 13.94 rpm.
