Question

In: Physics

On his way to class, a student on a skateboard is accelerating on a downhill stretch....

On his way to class, a student on a skateboard is accelerating on a downhill stretch. Which of the following are true.

I know the answer is

a) the skateboarder is moving in the direction of the net force

b) the skateboarder is subjected to a net external force in the direction of motion

c) the skateboarders acceleration is in the direction of the net force

I am struggling to understand why all three of these answers are correct. Could you possibly explain to me why each of these is correct. I know it is in correlation with Newtons first law but i need further explanation to help understand it because it is not clicking in my head.

Thank you for your time!!

Expert Solution

Newton's first law of motion predicts the behavior of objects for which all existing forces are balanced. The first law - sometimes referred to as the law of inertia - states that if the forces acting upon an object are balanced, then the acceleration of that object will be 0 Objects at equilibrium (the condition in which all forces balance) will not accelerate. According to Newton, an object will only accelerate if there is a net or unbalanced force acting upon it. The presence of an unbalanced force will accelerate an object - changing its speed, its direction, or both its speed and direction.

Newton's second law

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object

now come to the questions

the skateboarder is moving in the direction of the net force

so ther there is net force or external net force or residual force after all focee has been balanced

so the object will move downhill because there will be net force componant in the direction of downhill

like a box on a friction less inclined plane moves down because ther is net force downward

b) the skateboarder is subjected to a net external force in the direction of motion

yes , it is correct becuse without net force he will not move in that direction unless there is no net force

the skateboarders acceleration is in the direction of the net force

because

a = Fnet / m

genius_generous answered 1 year ago

For a project in his statistics class, a student is attempting to create a formula for...

For a project in his statistics class, a student is attempting to create a formula for the number of cars in the dorm parking lot that are either sedans, SUVs or pickup trucks. His formula states that there should be 20% sedans, 55% SUVs and 25% pickups. To validate his formula, he finds the following actual values for the 100 vehicles in the lot: Sedan: 25 SUV: 45 Pickup: 30 Can we believe that his formula is correct? Use an alpha...

Joshua is a 7 years old class 2 student who lives with his parents and his...

Joshua is a 7 years old class 2 student who lives with his parents and his 4 siblings in a rural settlement and has been diagnosed with a CHRONIC ILLNESS of TUBERCULOSIS that will require frequent admission or visits to the hospital. His father is a security officer and his mother stays home and is a house wife. TUBERCULOSIS 1. overview and Etiology of the chronic illness you have chosen. 2. Discuss the significance of the pathophysiology and clinical manifestations...

Joshua is a 7 years old class 2 student who lives with his parents and his...

Joshua is a 7 years old class 2 student who lives with his parents and his 4 siblings in a rural settlement and has been diagnosed with a CHRONIC ILLNESS of TUBERCULOSIS that will require frequent admission or visits to the hospital. His father is a security officer and his mother stays home and is a housewife. TUBERCULOSIS Using the development theory, discuss the impacts of the chronic illness on Joshua's growth and development with reference to the literature. Discuss...

a. ) Rainwater harvesting is regarded as the simplest way of improving food security and accelerating...

a. ) Rainwater harvesting is regarded as the simplest way of improving food security and accelerating environmental rehabilitation in the arid and semi-arid lands. Describe and discuss various technologies for rainwater harvesting for agriculture and domestic/livestock water supply ) What are the steps and data requirements in the design of an earth dam as a water harvesting and storage structure in an arid and semi-arid area?

Suppose the government is considering an increase in the toll on a certain stretch of high-way...

Suppose the government is considering an increase in the toll on a certain stretch of high-way from $0.40 to $0.50. At present, 50,000 cars per week use that highway stretch; after the toll is imposed, it is projected that only 40,000 cars per week will use the highway stretch. (a)(15 pts) Assuming that the marginal cost of highway use is constant (i.e., the supply curve is horizontal) and equal to $0.40 per car, what is the net cost to society...

Suppose the government is considering an increase in the toll on a certain stretch of high-way...

Suppose the government is considering an increase in the toll on a certain stretch of high-way from $0.40 to $0.50. At present, 50,000 cars per week use that highway stretch; after the toll is imposed, it is projected that only 40,000 cars per week will use the highway stretch. (a)(15 pts) Assuming that the marginal cost of highway use is constant (i.e., the supply curve is horizontal) and equal to $0.40 per car, what is the net cost to society...

Mr. Fantastic (from the fantastic four) has the ability to stretch his body. Describe his super...

Mr. Fantastic (from the fantastic four) has the ability to stretch his body. Describe his super power using the material property terms. Make sure to include the following terms in your description: Elongation to failure, elastic modulus, stiffness, and yield strength. You may need to perform a quick internet search to understand his character superpowers. If you are not familiar with the character please read the powers and abilities section of this website https://comicvine.gamespot.com/mr-fantastic/4005-2151/ to get a general idea of...

Another student must pass through 12 sets of traffic lights on his way to university each...

Another student must pass through 12 sets of traffic lights on his way to university each day. Suppose that each of the lights is green 36% of the time, yellow 5% of the time, and red 59% of the time. Suppose it is known that the traffic lights function independently. (a) What is the probability that the student encounters exactly five red lights on his way to university one day? (b) What is the probability that the student encounters at...

***Given a class called Student and a class called Course that contains an ArrayList of Student....

***Given a class called Student and a class called Course that contains an ArrayList of Student. Write a method called dropStudent() as described below. Refer to Student.java below to learn what methods are available.*** Course.java import java.util.*; import java.io.*; /****************************************************** * A list of students in a course *****************************************************/ public class Course{ /** collection of Students */ private ArrayList<Student> roster; /***************************************************** Constructor for objects of class Course *****************************************************/ public Course(){ roster = new ArrayList<Student>(); } /***************************************************** Remove student with the...

Mr. Cooper recently gave a test to his 50 student history class. The scores were normally...

Mr. Cooper recently gave a test to his 50 student history class. The scores were normally distributed with a mean of 75 and a standard deviation of 7. 1) What percentage of students scored higher than 85?% (Round to two decimal places) 2) What percentage of students scored between 73 and 80?% (round to two decimal places) 3) 75% of the students scored higher than what score? (Round to two decimal places) 4) 30% of students scored lower than what...

Question

On his way to class, a student on a skateboard is accelerating on a downhill stretch....

Solutions

Expert Solution

Related Solutions

For a project in his statistics class, a student is attempting to create a formula for...

Joshua is a 7 years old class 2 student who lives with his parents and his...

Joshua is a 7 years old class 2 student who lives with his parents and his...

a. ) Rainwater harvesting is regarded as the simplest way of improving food security and accelerating...

Suppose the government is considering an increase in the toll on a certain stretch of high-way...

Suppose the government is considering an increase in the toll on a certain stretch of high-way...

Mr. Fantastic (from the fantastic four) has the ability to stretch his body. Describe his super...

Another student must pass through 12 sets of traffic lights on his way to university each...

***Given a class called Student and a class called Course that contains an ArrayList of Student....

Mr. Cooper recently gave a test to his 50 student history class. The scores were normally...