Mechanics> An object of mass 1kg moving on a horizon...

An object of mass 1kg moving on a horizontal surface with initial velocity 8m/s comes to rest after 10s . If one wants to keep the object moving on the same surface with velocity 8m/s the force required is....1. 0.4N2. 0.8N3. 1.2N4. Zero

Asmita Pandey , 8 Years ago

Grade 11

2 Answers

Diwankar singh

Last Activity: 8 Years ago

mass=1kginitial velocity`u`=8m/sfinal velocity`v`=0m/stime=10 sec.therefore, acceleration=v-u/t =0-8/10 =-0.8m/s^2Force=mass*acceleration =1*(-0.8) = -0.8NWe know that force cannot be in negative therefore, force applied =0.8N

nidhi

Last Activity: 7 Years ago

v = u + at

v = 0

0 = 8 – $\displaystyle \mu$ g(10)

$\mu$ = 8/100 = 0.08

To move the body withconstant velocity on this surface, internal force applied should be equal to friction force

F = $\mu$ mg

= (0.08)(1)(10)

= 0.8N

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Mechanics> An object of mass 1kg moving on a horizon...

An object of mass 1kg moving on a horizontal surface with initial velocity 8m/s comes to rest after 10s . If one wants to keep the object moving on the same surface with velocity 8m/s the force required is....1. 0.4N2. 0.8N3. 1.2N4. Zero

Asmita Pandey , 8 Years ago

Diwankar singh

nidhi

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