Physics: Newton's Third Law, Easy 10 points?

1) For every force applied, there is an equal and opposite force exerted. I f you push on the inside of the care, the car is pushing back and there is no other substance you can push on to move the car. If you are outside the car, You are exerting a force against the car and the ground. The car pushes back, but since you are also pushing off the ground and not the car, you can move it.

2)Force=mass x acceleration. So a=F/m.

The mass of the Earth is so large compared to that tiny amount of Force you apply, that the acceleration will be very small as well. It's like dividing 1/10000. The answer is too small to pay attention to.

3) Fnet=F1+F2+F3...

There is usually more than one force acting on an object. If you are standing still, the Force of Gravity is pushing you down against the Earth and you are exerting a Force against gravity to hold yourself up called the Normal Force. So Fgravity + Fnormal = Fnet

1 ) you're applying a force to the ground and in your body you are transferring the force to the car through you hands. where as in side the car you are pushing on the dash board in one direction then opposing that motion in the other by pushing against your seat.

2)F_you=Mass_ of you*acceleration_of_ you

F_earth= Mass_earth*acceleration_earth

F_you=F_earth

acceleration_earth=(Mass_ of you*acceleration_of_ you)/Mass_earth

this is very small and is insignificant when you factor in all the different directions the earth is continuously being pushed in by others stepping. the gravity created by the sun holds the earth to a specific path.

3) think football. a net force comes about when sum of the forces in on direction ie x, y, or z. when blocking is done force is applied by both players. if the offensive player applies a greater force that the defensive player. the defensive play is pushed back. this can go either way. when there is a stalemate between the 2 players the net force = 0