Trouble finding Fnet without a known mass for an acceleration. Please assist.

  • Thread starter Thread starter *sperry*
  • Start date Start date
  • Tags Tags
    Acceleration Mass
AI Thread Summary
The discussion centers on calculating the time, acceleration, and net force experienced by a car moving through a muddy area. The car's initial and final velocities, along with the distance of the muddy surface, are provided, allowing for the determination of time and acceleration. However, the net force calculation is problematic due to the absence of the car's mass, which is necessary to apply Newton's second law. Participants express confusion over how to derive the net force without this critical information. The conversation highlights the importance of having all variables, particularly mass, to solve physics problems accurately.
*sperry*
Messages
1
Reaction score
0
1. A car is moving to the right with velocity 22.2 m/s when it enters an area having a soft, muddy surface. If the soft surface is only 25.0 m long, but the car slows to 15.3 m/s while going through the muddy area, answer the following:

A) What length of time (in seconds) was the car in the muddy area?

B) What acceleration did the car experience?

C) What was the value of the net force causing the acceleration?



2. 2d/vi+vf=ΔT
a=vf^2-vi^2/2d
Fnet=ma



3. A) ΔT=1.33s

B) a=-5.19m/s

C) Answer is apparently -6220 N but I don't know how to get it.



I have trouble getting C. I don't have a mass so I'm not sure how to find Fnet. I feel like I'm missing a relationship here.
 
Physics news on Phys.org
Without the mass you cannot determine the force. Did you leave any information out of the problem statement?
 

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 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Figure 1 Overall Structure Diagram Figure 2: Top view of the piston when it is cylindrical A circular opening is created at a height of 5 meters above the water surface. Inside this opening is a sleeve-type piston with a cross-sectional area of 1 square meter. The piston is pulled to the right at a constant speed. The pulling force is（Figure 2）： F = ρshg = 1000 × 1 × 5 × 10 = 50,000 N. Figure 3: Modifying the structure to incorporate a fixed internal piston When I modify the piston...
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

Calculate the Acceleration of this Car
Replies
7
Views
940
Calculate gravitational acceleration without mass of both objects
Replies
1
Views
2K
Radial & Tangential Acceleration of a Car at Indianapolis 500 | Physics Solution
Replies
7
Views
4K
The point at which 2 vehicles meet
Replies
22
Views
2K
Trouble finding correct acceleration of a ball
Replies
6
Views
1K
Positive or negative final velocity? Constant acceleration
Replies
8
Views
4K
Kinematics question, easier way to do this?
Replies
6
Views
3K
How to find coefficient of friction *Without* mass?
Replies
3
Views
22K
Do I need to consider mass in the equations?
Replies
3
Views
1K
Forces involved in egg-drop experiment: 25 Newtons to Break an Egg?
Replies
7
Views
9K

Hot Threads

Recent Insights

Back
Top