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!!

Solutions

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

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