a. State Newton's secondlaw of motion
b. A car of mass 800 kg is travelling with a velocity of 20m's. When brakes are applied it stops after
travelling a distance of 8 meters. Find the retardation and theretarding force.
Answers
Answer:
Newton's three laws of motion may be stated as follows: Every object in a state of uniform motion will remain in that state of motion unless an external force acts on it. Force equals mass times acceleration [ ]. For every action there is an equal and opposite reaction.
Explanation:
a) Newton's second law states that the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.
b) 62
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Answer:
Given:
mass(m)=800kg
initial velocity (u)=20 m/s
final velocity (v) =0 m/s
distance(s)= 8m
We have to find acceleration which is the retardation.
2as = v square - u square
2a×8 = 0 square × 20 square
16a= - 400
a=-400/16
a= -25 m/s
Retarding force:
F=ma
F= 800 × (-25)
F= -20000N