Physics Test Question Solution?

  • Thread starter Thread starter MyNameIsMud
  • Start date Start date
  • Tags Tags
    Physics Test
AI Thread Summary
The physics problem involves a skateboarder who travels 3.2 meters while decelerating from 95 cm/s to 51 cm/s, with the goal of finding the constant acceleration and total time. To solve it, one should use kinematic equations that relate initial velocity, final velocity, displacement, and acceleration. It's crucial to convert the velocities from centimeters per second to meters per second for consistency in units. The discussion emphasizes the importance of applying the correct kinematic equation to derive the solution. Understanding these principles will lead to the correct answers for acceleration and time.
MyNameIsMud
Messages
1
Reaction score
0

Homework Statement


So I just had a Physics test and I couldn't get the solution to this problem. I was hoping someone could tell me how to do it correctly.

This isn't the exact wording, as I already forgot it, but here it goes:

A skateboarder moves on his skateboard horizontally 3.2m, in that distance his velocity changed from 95 cm/s to 51 cm/s. what is the acceleration assuming its constant? What is the total time of this event?


Homework Equations


5 equations for constant acceleration


The Attempt at a Solution


It's on my test paper.
 
Physics news on Phys.org
MyNameIsMud said:

Homework Statement


So I just had a Physics test and I couldn't get the solution to this problem. I was hoping someone could tell me how to do it correctly.

This isn't the exact wording, as I already forgot it, but here it goes:

A skateboarder moves on his skateboard horizontally 3.2m, in that distance his velocity changed from 95 cm/s to 51 cm/s. what is the acceleration assuming its constant? What is the total time of this event?


Homework Equations


5 equations for constant acceleration


The Attempt at a Solution


It's on my test paper.

Welcome to the PF.

What is the equation for acceleration in terms of Δv and Δt?

Be sure to be consistent in your units as well. It's probably best to convert those velocities into m/s before doing the calculation.
 
MyNameIsMud said:

Homework Statement


So I just had a Physics test and I couldn't get the solution to this problem. I was hoping someone could tell me how to do it correctly.

This isn't the exact wording, as I already forgot it, but here it goes:

A skateboarder moves on his skateboard horizontally 3.2m, in that distance his velocity changed from 95 cm/s to 51 cm/s. what is the acceleration assuming its constant? What is the total time of this event?

Homework Equations


5 equations for constant acceleration

The Attempt at a Solution


It's on my test paper.
One of those kinematic equations relates the following:
initial velocity
final velocity
displacement
acceleration​
Use that equation.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

High School Physics Question -- Skateboarder Jumps & Conservation of Momentum
Replies
3
Views
2K
Calculating Motion of a Test Balloon on a Methane Planet
2
Replies
62
Views
4K
Calculating Velocity after Skateboard Jump - A Physics Problem
Replies
1
Views
3K
An interesting GCSE question: Why are electric lamps connected in parallel in house wiring?
Replies
14
Views
409
Momentum and Impulse questions
Replies
1
Views
3K
Physics momentum/ speed question. Need help
Replies
6
Views
8K
Special Relativity: What are the events in the question?
Replies
29
Views
2K
Help with question on motion: Avoiding a rear-end collision
Replies
6
Views
3K
Question about springs and rotational/translational energy
Replies
4
Views
1K
Finding tension of a string spinning horizontally
Replies
9
Views
2K

Hot Threads

Recent Insights

Back
Top