According to Newton's first law of motion, the forces acing on the large
crate at rest on the ramp are balanced such that there is no net force acting on it.
The correct options are;
Reasons:
The weight, which is the gravity force, of the large crate acts vertically
towards the ground and the normal reaction of the ground to the weight
results in a normal force.
Therefore;
- Normal force and gravity force are present.
The presence of the normal force and friction at the contact surface
between ramp and the crate provides a friction force that acts along the
surface of the ramp.
Therefore;
- A friction force is present.
Given that the crate is at rest, the friction force is equal to the component
of the weight acting along the ramp, such that the two forces balance.
The crate is at rest therefore, the weight, the normal reaction, and the
friction force all balance each other and no other forces are required for
the crate to remain at rest.
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