Physics Force & Laws Of Motion Level: High School
Tension in a String
A pendulum (see the figure at “click here”) is 0.800 m long and the bob has a mass of 1.00 kg . When the string makes an angle of theta = 15.0 degree with the vertical , the bob is moving at 1.40 m/s . Let g = 9.80 m/s^2 . Find the tangential and centripetal acceleration components and the tension in the string . [Draw an FBD for the bob . Choose the x-axis to be tangential to the motion of the bob and y-axis to be centripetal. Apply Newton’s second law.]
Physics Force & Laws Of Motion Level: High School
Banking of roads
A curve in a stretch of a highway has radius R , The road is banked at angle theta , to the horizontal . The coefficient of static friction between the tires and road is micro s . What is the fastest speed that a car can travel through the curve ?
Physics Force & Laws Of Motion Level: High School
Tension in a string
A 45-N lithograph is supported by two wires . One wire makes a 25 degree angle with the vertical and the other makes a 15 degree angle with the vertical . Find the tension in each wire .
Physics Force & Laws Of Motion Level: High School
Tension in a string
A pulley is hung from the ceiling by a rope. A block of mass M is suspended by another rope that passes over the pulley and is attached to the wall (the figure below) . The rope fastened to the wall makes a right angle with the wall . Neglect the masses of the rope and the pulley . Find ,a) The tension in the rope from which the pulley hangs and
b) The angle theta , that the rope makes with the ceiling .
Physics Force & Laws Of Motion Level: High School
Centrifugal Force
A centrifuge is used to separate particles from a solution in which they are suspended . This can only work if they are spun out toward the walls before they come to rest at the bottom of the container. Compare the weight of a particle with force exerted on it by the walls of centrifuge 19.0 cm in diameter rotating at 3200.0 rev / sec . Give your answer as a ratio .
Physics Force & Laws Of Motion Level: High School
Banking
An engineers is to design a highway for the worst case scenario – slick conditions where there is negligible friction between a car’s tires and the road . How steeply should the road be banked at a curve whose radius of curvature is 218.0 m , if it is to be safe for vehicles traveling at 59.0 mph ?
Physics Force & Laws Of Motion Level: High School
The drawing at “click here” shows a baggage carousel at an airport . Your suitcase has not slid all the way down the slope and is going around at a constant speed on a circle (r = 10.8m) as the carousel turns . The coefficient of static friction between the surface and the carousel is 0.760, and the angle theta in the drawing is 33.2 degrees . How much time is required for your suitcase to go around once ?
Physics Force & Laws Of Motion Level: High School
A car traveling down hill with a constant velocity, which of the following is true .a) There is a net force acting on the car in the downhill direction .
b) There is a net force on the car in the uphill direction .
c) Uphill force acting on the car balance and cancel one another .
d) There is no force acting on the car .
Physics Force & Laws Of Motion Level: High School
Impulse
A 200 g ball hits a wall perpendicular with a velocity of 30 m/s and rebounds back with a velocity of 20 m/s if the collision lasts for 5 ms , find the average force exerted by the ball on the wall .a) 1000 N
b) 2000 N
c) 4000 N
d) 6000 N
Physics Force & Laws Of Motion Level: High School
A 80 kg crate is pulled up a frictionless 300 incline by a rope with an acceleration of 1.5 m/s^2 . If the rope is parallel to the incline what is the tension in the rope ? (Assuming g = 10 m/s^2 )a) 400 N .
b) 520 N.
c) 120 N .
d) 280 N .
Physics Force & Laws Of Motion Level: High School
Friction
A women is driving in her car delivering a crate of flowers sitting next to her passenger seat . The coefficient of static friction between her blue jeans and her leather seats in her car is .58 . She also know a right hand bend in the road ahead has a radius of curvature of 70 m . What minimum speed in km/hr is needed around the curve for her to get the crate of flowers to slide to her side of the car .
Physics Force & Laws Of Motion Level: High School
Third Law of Motion
For each of the following intersections , identify the action and reaction forces .a) A hammer and a nail
b) Earth’s gravity pulls down on a book
c) A helicopter blade pushes air downward
Physics Force & Laws Of Motion Level: High School
Second Law of Motion
A net force of 14 N gives a cart an acceleration of 2 m/s . What is the mass of the cart
Physics Force & Laws Of Motion Level: High School
First Law of Motion
If an object is at rest , can we conclude that there are no external force acting on it ? Explain .
Physics Force & Laws Of Motion Level: High School
Finally you are leaving Omaha to get a few days of fall break , but your car breaks down in the middle of nowhere . A tow truck weighing 4000 lbs comes along and agrees to tow your car , which weighs 2000lbs , to the nearest town . The driver of the truck attaches his cable to your car at an angle of 20 degrees to the horizontal. He tells you that his cable has a strength of 500 lbs . He plans to take 10 seconds to tow your car at a constant acceleration from rest in a straight line along the flat road until he reaches the maximum speed limit of 45 miles / hour . Can the driver carry out his plan ? You assume that rolling friction behave like kinetic friction , and the coefficient of rolling friction between your tires and the road is 0.10 .