A Concrete Slab Is Moved Across a Room with a Force

question 107

Multiple Choice

A concrete slab is moved across a room with a force of 250 N, while friction acts on the slab with a force of 15 N. What is the net force acting on the slab?

• A)250 N
• B)265 N
• C)235 N
• D)15 N

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Definitions:

Sensory Adaptation

The process by which sensory receptors become less sensitive to constant stimuli over time.

Difference Threshold

The minimum difference in stimulation that a person can detect 50% of the time, also known as the just noticeable difference.

Retina

The light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information.

Retinal Disparity

A binocular cue for perceiving depth. By comparing retinal images from the two eyes, the brain computes distance— the greater the disparity (difference) between the two images, the closer the object.