Physics Force & Laws Of Motion Level: High School
Friction
A crate of oranges weighing 180 N rests on a flatbed truck 2.0 m from the back of the truck . The coefficient of friction between the crate and the bed are micro s = 0.30 and micro k = 0.20 . The truck drives on a straight level highway at a constant 8.0 m/s .a) What is the force of friction acing on the crate ?
b) IF the truck speed up with an acceleration of 1.0 m/s^2 , What is the force of friction on the crate ?
c) What is the maximum acceleration the truck cabin have without the crate starting to slide ?
Physics Force & Laws Of Motion Level: High School
In the fairly table Rapunzel , the beautiful maiden let her long golden hair hang down from the tower in which she was held prisoner so that her prince could use her hair as a climbing rope to climb the tower and rescue her . Estimate how much force is required to pull a strand of hair out of your head . Next estimate how many hairs might be growing out of Rapunzel’s head . If the prince has a mass of 60 kg , What is the force pulling on each strand of hair ? Will Rapunzel be bald by the time the prince reaches the top of the 30-m tower ?
Physics Force & Laws Of Motion Level: High School
Spring Constant
The forces required to extend a spring to various lengths are measured . The results are shown in the table below . Using the data in the table , plot a graph that helps you to answer the following two questions :a) What is the spring constant ?
b) What is the relaxed length of the spring ?
Force (N) 1.00 2.00 3.00 4.00 5.00
Spring Length 14.5 18.0 21.5 25.00 28.0
Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
A toy freight train consists of an engine and three identical cars . The train is moving to the right at constant speed along a straight , level track . Three spring scales are used to connect the cars as follows : spring scale A is located between the engine and the first car : scale B is between the first and second cars ; Scale C is between the second and third cars .a) If air resistance and friction are negligible , what are the relative reading on the three spring scales A, B and C ?
b) Repeat part (a) , taking air resistance and friction into consideration this time .
c) If air resistance and friction together cause a force of magnitude 5.5 N on each car , directed toward the left , find the readings of scales A , B and C
Physics Force & Laws Of Motion Level: High School
Tension in a String
A block is hanging from the ceiling by a single wire . When a horizontal force of 12 N is applied on the block the wire makes an angle of 20 degrees with the vertical, as shown in the figure at “click here” . What is the mass of the blocka) 0.44 kg
b) 1.2 kg
c) 1.3 kg
d) 3.4 kg
e) 3.6 kg
Physics Force & Laws Of Motion Level: High School
Tension in a String
A 10-m uniform beam of weight 100 N is supported by two ropes at the ends . If a 400-N person sits at 2.0 m from the left end of the beam , what is the tension in the left rope ?a) 130N
b) 250 N
c) 300 N
d) 370 N
e) 500 N
Physics Force & Laws Of Motion Level: High School
Conservation of Momentum
An object of mass 3 kg ,initially at rest , explodes breaking into two fragments of masses 1 kg and 2 kg ,respectively , which one of the following statements concerning the fragments after the explosion is true ?a) The larger fragment remains at rest
b) The larger fragment will have twice the speed of the smaller fragment
c) The larger fragment will have four times the speed of the smaller fragment .
d) Both fragments will fly with the same speed
e) The smaller fragment will have twice the speed of the larger fragment .
Physics Force & Laws Of Motion Level: High School
Impulse
Joe throws a 0.15 kg rubber ball directly downward to the floor . The ball’s speed just before impact is 6.5 m/s and just after the impact is 3.5 m/s . If the ball is in contact with the floor for 0.025 s , what is the magnitude of the average force that the floor exerts on the ball during the time of contact ?a) 3.0N
b) 18 N
c) 30 N
d) 60 N
e) 130 N
Physics Force & Laws Of Motion Level: High School
Friction
Two packages as UPS starts sliding down the 20 degree ramp . Package A (in front of B) has a mass of 5.0 kg and a coefficient of friction of 0.20 . Package B has a mass of 10 kg and a coefficient of friction of 0.15 . How long does it take package A to reach the bottom ?
Physics Force & Laws Of Motion Level: High School
A book of mass m 1kg slides across an ordinary table . What forces act on the book ?
Physics Force & Laws Of Motion Level: High School
Momentum
A car of mass 1000 kg moves with a speed of 20 m/s directly north . What is the car’s momentum ?
Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
A force of 30 N , directed to the east , is applied to a stationary crate of mass 3 kg , Determine the acceleration of the crate .
Physics Force & Laws Of Motion Level: High School
Tension in a String
A light fixture of mass 3 kg hangs from a wire . What is the tension in the wire ?
Physics Force & Laws Of Motion Level: High School
Spring Constant
A force of 100 N is needed to compress a spring by 0.02 meters . IF the force is directly proportional to the compression distance, determine the force required to compress the spring by 0.04 meters .
Physics Force & Laws Of Motion Level: High School
A spring is suspended vertically from a fixed support . The spring constant is k = 100 N/m . When a heavy object is attached to the bottom of the spring , the spring stretches by 0.2 meters . Determine the weight (force of gravity) pulling on the object , as well as the object’s mass .