Final answer:
The student's question relates to using the equation Fnet=ma to solve problems involving net force, mass, acceleration, and friction in various contexts.
Step-by-step explanation:
Understanding Fnet = ma with Friction
The equation Fnet = ma is central to Newtonian mechanics and describes the relationship between the net force acting on an object, its mass (m), and the acceleration (a) it experiences. Furthermore, friction is a force that resists motion, often calculated as f = μkmg, where μk is the coefficient of kinetic friction and g is the acceleration due to gravity.
In solving the provided problems:
- Problem 46 involves calculating the applied force from an engine considering the car's weight, acceleration, and friction force.
- Problem 47 considers the net force on a body with mass and the force of Earth's gravity acting on it when no other external forces are present.
- Problem 48 addresses the vertical force a fireman must apply to slow down his descent on a pole, taking into account his mass and acceleration.
- Problem 49 asks for the force exerted by a catcher's glove on a ball, given the ball's mass, drop height, and the time it takes to stop.
Each of these problems requires the application of Newton's second law and understanding of forces such as friction and gravity.