• Got a question on how to use our new website? Check out our user guide here!

Physics Year 11 Question Help (1 Viewer)

flowerp

Member
Joined
May 15, 2017
Messages
42
Gender
Undisclosed
HSC
N/A
Hi, I would like help with the following question:

A car of mass 1500 kg is towing a trailer of mass 500 kg on level road.
i) What is the resultant force on the trailer when travelling at a steady speed of 60km/hr?
ii) What is the resultant force on the trailer when accelerating at 0.8 m/s^2?

Thank you!!!
 

Drdusk

sin(x) = tan(x) = x
Joined
Feb 24, 2017
Messages
264
Gender
Male
HSC
2018
Uni Grad
2023
i)
Remember the equation F = ma. Since the car & trailer is travelling at a constant speed 'a' must be zero. Which means the net resultant force is zero

ii) So we have a = 0.8. Just chuck that into F = ma, where m = 500kg as we need the resultant force on the trailer. This gives F = 400N.
However in most questions you would have friction, so you would've needed to balance the forces as so.

 

flowerp

Member
Joined
May 15, 2017
Messages
42
Gender
Undisclosed
HSC
N/A
i)
Remember the equation F = ma. Since the car & trailer is travelling at a constant speed 'a' must be zero. Which means the net resultant force is zero

ii) So we have a = 0.8. Just chuck that into F = ma, where m = 500kg as we need the resultant force on the trailer. This gives F = 400N.
However in most questions you would have friction, so you would've needed to balance the forces as so.

Thank you very much !!!!!!!!!!
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top