Newton's second law Definition and 260 Threads

This question is driving me insane... An arrow, starting from rest, leaves the bow with a speed of 25.0 m/s. If the average force exerted on the arrow by the bow were doubled, all else remaining the same, with what speed would the arrow leave the bow? Of course, instinct says 50 m/s, but...

Hi I got a few questions that I could not answer about Newton's Second Law of Motion. Can someone please help me? 1) A 1.08 x 10^3 kg car uniformly accelerates for 12.0s from rest.. During this time the car travels 132 m north. What is the net force acting on the car during this acceleration...

Hi. I have this problem: The fastest cars can travel at 350km/h. When you take the foot of the gaspedal the air will decrease the speed of the car. This leads to a retardation (I hope it's the right word for it) at 1.1 g. Which force (N) will affect the driver (80kg)? The weight of the car...

A block of mass 2.0kg is placed on a smooth plane, inclined to the horizontal at an angle of 15degrees. The force of gravity, acting straight down on the block, is 20N. a) What is the acceleration of the block down the plane? I'm having trouble with this because I know: Net...

Science howework A crate rests on a horiontal floor. Only gravity and the support force of the floor act on it. A slight pull P is exerted on the crate, not enough to move it. A force of friction f now acts on it. is f, less than, equal, or greater than P? is the net force on the crate...

The differential equations that are mostly used in physics are second order, so I am wondering about the third order (or more)? It is clear that in real life, like when driving a car, acceleration changes many times and continuously, but do people ever add d3x/dt3 to Newton's second law? Is it...

I was reading a section about rocket propulsion in my general physics text and it came up with the following formula: m \frac{dv}{dt} = - v_{ex} \frac{dm}{dt} I don't have much trouble with this formula, but then it went ahead and substituted m dv/dt as the thrust experianced by the...

A string wrapped around a cylinder, and is held by a hand (to the up right of the cylinder so the cylinder is rotating clockwise) that is accelerated upward so that the centre of mass of the cylinder does not move. a) Find the tension in the string. b) Find the angular acceleration of the...

Hello everyone. I'm having a little trouble understanding the whole "ball and bowl" problem using Newton's Second Law. What I'm talking about involves a small shpere of mass m and radius r, rolling down a "bowl" (more like a hemisphere of radius R). How would one go about finding the KE of...

This question has been troubling me... : A physics teacher decides to use bathroom scales (calibrated in Newtons) in an elevator. The scales provide a measure of the force with which they push up on the teacher. When the lift is stationary the reading on the bathroom scales is 823 N. What...