Question

use the following situations to answer the question:
a cat jumping on the counter
a book on a bookshelf
a cup sitting on a table
a bike accelerating 1.0 m/s^2
a house built on a concrete slab
a person slipping on a banana peel
which objects in the list experience an unbalanced net force?
the person and the house
the cat and the person
the cat, cup, and house
the bike and the person

Explanation:

Step1: Recall Newton's first - law concept

An object has an unbalanced net force when it is accelerating or changing its state of motion.

Step2: Analyze each situation

• A cat jumping on the counter: It is changing its motion (accelerating during the jump), so it has an unbalanced net force.
• A book on a bookshelf: It is at rest and not changing its state of motion, so the net force is balanced.
• A cup sitting on a table: It is at rest and not changing its state of motion, so the net force is balanced.
• A bike accelerating 1.0 m/s²: It is accelerating, so it has an unbalanced net force.
• A house built on a concrete slab: It is at rest and not changing its state of motion, so the net force is balanced.
• A person slipping on a banana peel: The person's motion is changing (falling or moving in an uncontrolled way), so it has an unbalanced net force.

Answer:

The bike and the person