A box $B$ sits in the back of a truck $T$ as the truck slows down for a stop (the box remains motionless relative to the truck). What is the appropriate symbol for the horizontal force that the contact interaction between the box and the truck exerts on the truck?
A) $\vec{F}_{N}^{B(T)}$

B) $\vec{F}_{N}^{\mathrm{T}(\mathrm{B})}$

C) $\vec{F}_{S F}^{B(T)}$

D) $\vec{F}_{S F}^{\mathrm{T}(B)}$

E) $\vec{F}_{K F}^{\mathrm{B}(\mathrm{T})}$

F) Other (specify)

Question

A box $B$ sits in the back of a truck $T$ as the truck slows down for a stop (the box remains motionless relative to the truck). What is the appropriate symbol for the horizontal force that the contact interaction between the box and the truck exerts on the truck?
A) $\vec{F}_{N}^{B(T)}$

B) $\vec{F}_{N}^{\mathrm{T}(\mathrm{B})}$

C) $\vec{F}_{S F}^{B(T)}$

D) $\vec{F}_{S F}^{\mathrm{T}(B)}$

E) $\vec{F}_{K F}^{\mathrm{B}(\mathrm{T})}$

F) Other (specify)

Quizplus · Accepted Answer

The correct symbol is $\vec{F}_{S F}^{\mathrm{T}(B)}$, which stands for the static friction force exerted by the truck on the box. This force is what prevents the box from sliding in the truck as it slows down. The notation indicates that it is a static friction ($SF$) force, with the superscript indicating the direction of the force (from the truck $T$ on the box $B$).

A Box BBB Sits in the Back of a Truck TTT As the Truck Slows Down for a Stop (The Box

A Box $B$ Sits in the Back of a Truck $T$ As the Truck Slows Down for a Stop (The Box