(adsbygoogle = window.adsbygoogle || []).push({}); [SOLVED] The NET FORCE and a lawnmower

1. The problem statement, all variables and given/known data

Well im working on a quesiton here and am finding trouble with one part. The answers are in brackets. The trouble im having is with part c, where i believe you have to find the accleration then the time to work out power which is equal to work over time.

A person pulls on a 20 kg lawn mower with 25 N and moves it 4.5 m. The handle of the lawnmower in inclined at 15 degrees above the horizontal and the friction co-effiecient is 0.1 If vi=0 find

a.)amount of work done by person (108.7)

b.)amount of heat energy generated by friction (85.3)

c.)rate at which the person does work (18.6 Watts)

d.)the final speed of the lawnmower(1.53)

2. Relevant equations

p = w/t, F=ma ---> a =F/m

3. The attempt at a solution

Well part a is basicaly w= fcos15 * 4.5 m

and b is finding out friction by using force diagrams and finding Fn

but c i am not sure how to find the accel and consequently the time.

wat is the net force in the system? please help. thank you.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: The NET FORCE and a lawnmower

**Physics Forums | Science Articles, Homework Help, Discussion**