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Physics question about forces.?
A person pushes a 40.0kg lawnmower. An applied push force 350N is along the shaft, the shaft has an angle 40.0 degrees above horizontal. The friction that acts between the grass and the wheels is 250N.
a) Determine the horizontal net force.
b) Determine the acceleration.
c) Determine the normal force.
We are given the answers but I think they might be wrong
a) 18.1N forward
b) o.453m/s^2
c) 617 N up
And also, is it possible to have a normal force that is bigger than a gravity force? It seems impossible because it would be floating or something.
Any explanation to this insanity will be cherished. Thank you.
1 Answer
- Demiurge42Lv 71 decade agoFavorite Answer
Find the horizontal and vertical components for the force applied by the person.
a) There are two horizontal forces, friction and the horizontal component from the person pushing. Add them together to get the total horizontal force. Don't forget that forces are vectors. One of these forces will be negative. The one that is negative will depend on which direction you pick to be the positive direction.
b) Use F = ma and the total force from part a.
c) There are 3 vertical forces.
1. The vertical component due to the person pushing.
2. The normal force
3. The force due to gravity
The sum of these forces will be zero since the mower isn't accelerating vertically.
