Speed bump reaction force on a car

AI Thread Summary
A car with a mass of 1950 kg hits a speed bump at a speed of 19.4 m/s, with the bump being 0.05 m high and at a 45° angle. The discussion centers on calculating the force acting on the front axle at the moment of impact, with some participants suggesting that the question may actually be about impulse rather than force. The force is considered indeterminate, as it depends on factors like tire rigidity. Participants recommend working symbolically and addressing the impulse direction and the movement of the car's tires post-impact. The conversation emphasizes the need for a conservation equation to relate these variables effectively.
Duffelmop
Messages
2
Reaction score
0

Homework Statement


Hi I need to solve the next problem: a car with a total mass of 1950KG hits a speed bump at 19,4m/s. The speed bump is 0,05m high and has a angle of 45°. The car hits the bump with the front axle first. How much force acts on the front axle on the moment of impact.

Homework Equations


I started with Newton's law... but I totally messed it up...
Also did some search work, but it made it only more complex for me:
http://www.shimrestackor.com/Code/User_Manual/Sections/Suspension_Velocity/suspension-velocity.htm

The Attempt at a Solution

Sorry for my bad english.
 
Physics news on Phys.org
Are you sure you have quoted the question exactly? Seems like it should be asking for impulse, not force.
 
haruspex said:
Are you sure you have quoted the question exactly? Seems like it should be asking for impulse, not force.

They asked us to answer how much force was acting on the car in those conditions. It was an exam question this morning, and i really couldn't solve it. It seems for me like there is something missing...
 
Duffelmop said:
They asked us to answer how much force was acting on the car in those conditions. It was an exam question this morning, and i really couldn't solve it. It seems for me like there is something missing...
The force is indeterminate, since it will depend on e.g. the rigidity of the tyres. Assume it means impulse.
It's best to work symbolically and only plug numbers in at the end. Let the car be moving initially at speed u, have mass m, and tyres radius r.
Let the impulse from the speed bump be J and the horizontal component of the car's speed immediately afterwards be v.
For simplicity, we can take the car's mass as being m/2 at the middle of the front wheels and m/2 at the middle of the back wheels.
1. In what direction will the impulse be?
2. In what direction will the front tyres be moving immediately after impact, and at what speed? (Assume no bounce.)
3. In what direction will the rear tyres be moving?

Can you write a conservation equation to relate these?
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Normal Reaction Forces on a Moving Car
Replies
4
Views
3K
Vertical acceleration due to car going over speed bump
Replies
11
Views
21K
Force on the car in a collision
Replies
38
Views
3K
Bump detection using accelerometer inside car, estimating suspension damping
Replies
15
Views
12K
Can a Strong Man Push Two Freight Cars at Different Speeds?
Replies
3
Views
3K
Normal Force of Car Hitting A Bump
Replies
5
Views
18K
Problem on Mechanics (Newton's law of motion)
Replies
4
Views
2K
How Do You Calculate Car Speed When Dodging a Water Balloon?
Replies
9
Views
3K
Coriolis Force on a Race Car at 45 Degrees North
Replies
3
Views
2K
Auto/Motor Design to 3D print RC car - Steering
Replies
8
Views
5K

Hot Threads

Recent Insights

Back
Top