Field forces are distinctly different than contact forces in that Select all that apply they are capable of acting over spatial separations they produce an effect even when the objects experiencing them do not touch the value is inversely proportional to the square of the separation distance they are generally much greater in magnitude than contact forces

Which of the following statements about the force of friction are accurate? (Choose all that apply)     The force of friction decreases as velocity increases.   Increasing the surface area of an object will increase the force of friction.   All objects have the same coefficient of friction with each other.   The force of friction acts in the direction opposite of motion.   The force of friction is determined, in part, by the magnitude of the normal force.   Increasing the mass of an object will increase the force of friction.

In this example, we are going to take a look at a different type of friction, one that is not described by equations for static-friction force and kinetic-friction force. When an object moves through a fluid (such as water or air), it exerts a force on the fluid to push it out of the way. By Newton's third law, the fluid pushes back on the object, in a direction opposite to the object's velocity relative to the fluid, always opposing the object's motion and usually increasing with speed. In high-speed motion through air, the resisting force is approximately proportional to the square of the object's speed v; it's called a drag force, or simply drag. We can represent its magnitude FD by FD=Dv2, where D is a proportionality constant that depends on the shape and size of the object and the density of air. When an object falls vertically through air, the drag force opposing the object's motion increases and the downward acceleration decreases. Eventually, the object reaches a terminal…

Question 2 To give a 22-kg child a ride, two teenagers pull on a 3.5- kg sled with ropes, as indicated in the figure (Figure 1). Both teenagers pull with a force of 55 N at an angle of 35° relative to the forward direction, which is the direction of motion. In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. You may want to review (Pages 134 - 136) . Part A Find the acceleration of the sled and child. Express your answer using two significant figures. Hν ΑΣφ ? a = m/s? Submit Request Answer Provide Feedback Figure 1 of 1 55 N 35° 57 N a 35° 55 N