- #1
jayberd
- 2
- 0
Problem:
A race car skidding out of control manages to slow down to 90km/h before crashing head-on into a brick wall. Fortunately, the driver is wearing a safety harness. Using reasonable values for the mass of the driver and the stopping distance, estimate the average force exerted on the driver by the safety harness, including its direction. Neglect any effects of frictional forces on the driver by the seat.
Equations:
F=ma this is net force, but what is average force?
vx=vox+axt
I tried using the vx equation to find the acceleration. I guessed the initial velocity of the car/driver was 130km/h and I also guessed it would take 5 seconds to bring the velocity down to 90km/h. I ended up getting a really tiny force no matter how I tried it. I also just tried finding the acceleration the normal way, but the same thing. Anyone else have a good way of going about this?
A race car skidding out of control manages to slow down to 90km/h before crashing head-on into a brick wall. Fortunately, the driver is wearing a safety harness. Using reasonable values for the mass of the driver and the stopping distance, estimate the average force exerted on the driver by the safety harness, including its direction. Neglect any effects of frictional forces on the driver by the seat.
Equations:
F=ma this is net force, but what is average force?
vx=vox+axt
I tried using the vx equation to find the acceleration. I guessed the initial velocity of the car/driver was 130km/h and I also guessed it would take 5 seconds to bring the velocity down to 90km/h. I ended up getting a really tiny force no matter how I tried it. I also just tried finding the acceleration the normal way, but the same thing. Anyone else have a good way of going about this?