A large crate is stationary on an ramp angled 35 degrees above the horizontal. Which of the following is

Question

the most accurate statement? (1 point)

The kinetic friction is acting on the crate at a constant, non-zero amount

The angle of the hill is high enough to cause the crate to begin to slide down the hill

The static friction force of the crate is higher than the component of gravity force pulling the crate down
the hill

The friction on the hill is low enough so that the crate will begin to slide down the hill

Answer 1

To determine the most accurate statement about the large crate that is stationary on a ramp angled at 35 degrees, let's analyze each option:

1. The kinetic friction is acting on the crate at a constant, non-zero amount: This is not accurate. Kinetic friction only acts when there is motion relative to the surface, and since the crate is stationary, kinetic friction does not apply.

2. The angle of the hill is high enough to cause the crate to begin to slide down the hill: This statement is also not accurate because the crate is stationary, which indicates that the angle is not steep enough for the gravitational force component parallel to the ramp to overcome static friction.

3. The static friction force of the crate is higher than the component of gravity force pulling the crate down the hill: This statement is true. The static friction force can adjust to balance the gravitational force component acting down the ramp as long as the crate remains stationary.

4. The friction on the hill is low enough so that the crate will begin to slide down the hill: This statement is not accurate because the crate is stationary; if it were to slide, it would mean that the static friction is insufficient. However, since the crate is stationary, we can conclude static friction is adequate.

The most accurate statement is: The static friction force of the crate is higher than the component of gravity force pulling the crate down the hill.