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pantera1 [17]
2 years ago
9

why does a car slide when it rolls over an icy patch on a road? A. cars have more momentum on icy surfaces. B. there is less fri

ction between the cars tires and the ice than between the car tires and the road. C. there is more friction between the cars tires and the ice than between the car tires and the road. D. cars have less momentum on icy surfaces.
Physics
2 answers:
Vaselesa [24]2 years ago
6 0
The answer is B
because if you compare a regular road and ice... ice is smoother and therefore has less friction 
sweet-ann [11.9K]2 years ago
6 0
B) because a road is usually covered in rocks which increases the friction, but since its now covered in ice which is usually a smooth surface is has less friction leading to the car sliding. Also if the top of the ice has melted it may hav left behind water and hitch is a lubricant and reduces friction
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the net external force on the 24-kg mower is stated to be 51 N. If the force of friction opposing the motion is 24 N, what force
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Answer:

PART A)

External force will be 75 N

PART B)

distance moved will be 1.125 m

Explanation:

PART A)

Given that net force on the mower is

F_{net} = 51 N

now we also know that friction force due to ground is given as

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now we have

F_{net} = F_{ext} - F_f

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so external force will be 75 N

PART B)

deceleration due to friction when external force is removed from it

a = \frac{F_f}{m}

a = \frac{24}{24} = 1 m/s^2

now we can find the distance by kinematics

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d = 1.125 m

so the distance moved will be 1.125 m

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3 years ago
the police department determined that the force required to drag a 130 N(29 lb) car tire across the pavement at a constant veloc
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f = μR, where μ is the friction coefficient and R is the reaction force, which will be equal to the weight.
100 = μ x 130
μ = 0.77
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