Physics Force & Laws Of Motion Level: High School
A 25 kg chair initially at rest on a horizontal floor requires a 365 N horizontal force to set it in motion . Once the chair is in motion, a 327 N horizontal force keeps it moving at a constant velocity .a) Find the coefficient of static friction between the floor and the chair .
b) Find the coefficient of kinetic friction between the floor and the chair .
Physics Force & Laws Of Motion Level: High School
A 75 kg man is in an elevator that is accelerating downward at the rate of 1.5 m/s .a) What is the true weight of the man in Newton’s ?
b) What is the net force acting on the man required to produce the acceleration ?
c) What is the apparent weight of the man in Newtons ?
d) What is the force on the man’s feet by the floor of the elevator ?
Physics Force & Laws Of Motion Level: High School
A racecar rounds a curve at 80 m/s . The radius of the curve is 400 m and the mass of the car is 1500 kg .a) What is the car’s centripetal acceleration ?
b) What is the net force on the car ?
Physics Force & Laws Of Motion Level: High School
The engine of a car is part of the car and cannot push directly on the car to accelerate it . Explain what external force acting on the car is responsible for the acceleration of the car .
Physics Force & Laws Of Motion Level: High School
If a curve with a radius of 80 m is perfectly banked for a car traveling 70 km/h , What must be the coefficient of static friction for a car not to skid when traveling at 90 km/h ?
Physics Force & Laws Of Motion Level: High School
The braking mechanism on an aircraft carrier can bring a 2 top plane to a stop in a time of 1.8 seconds . The plane lands at 80 mph . Determine the force required and the deceleration rate .
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 4 kg rifle firing an 8 g bullet at 650 m/s obeys the law of conservation of momentum .Determine the recoil speed of the rifle .
Physics Force & Laws Of Motion Level: High School
A car is traveling at 50.0 km/h on a flat highway ,a) If the coefficient of friction between road and tires on a rainy day is 0.100 , What is the minimum distance in which the car will stop ?
b) What is the stopping distance when the surface is dry and the coefficient of friction is 0.600 ?
Physics Force & Laws Of Motion Level: High School
A dockworker loading crates on a ship finds that a 20 kg crate , initially at rest on a horizontal surface , requires a 75 N horizontal force to set it in motion . However , after the crate in motion , a horizontal force of 60 N is required to keep it moving with a constant speed . Find the coefficients of static and kinetic friction between crate and floor .
Physics Force & Laws Of Motion Level: High School
A 1000 kg car is pulling a 300 kg trailer . Together , the car and trailer have an acceleration of 2.15 m/s squared in the forward direction . Neglecting friction force on the trailer , determinea) The net fore on the car
b) The net force on the trailer
c) The force exerted by the trailer on the car
d) The resultant force exerted by the car on the road
Physics Force & Laws Of Motion Level: High School
A 6.0 kg object undergoes an acceleration of 2.0 m/s squared .a) What is the magnitude of the resultant force acting on it ?
b) If this same force is applied to a 4.0 kg object , what acceleration is produced ?
Physics Force & Laws Of Motion Level: High School
To measure the static friction coefficient between a 2.1 kg block and a vertical wall , the setup shown in the drawing is used . A spring (spring constant = 411 N/m) is attached to the block . Someone pushes on the end of the spring in a direction perpendicular to the wall until the block not slip downward . If the spring in a setup is compressed by 0.072 m , What is the coefficient of static friction ?
Physics Force & Laws Of Motion Level: High School
Conservation of Momentum
Bullets are fired from and airplane in the forward direction of motion . The momentum of the airplane will be .
Physics Force & Laws Of Motion Level: High School
A Muck truck and a Volkswagen traveling at the same speed collide head on . The impact force is ?Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
In order to catch a ball , a baseball player extends the hand forward before the impact with the ball and then lets it ride backwards in the direction of the balls motion upon impact . Why, doing this reduces the force of impact on the players hand principally ?