select the correct answer. which is a good ex...
select the correct answer. which is a good example of a contact force? a. protons in the nucleus of an atom b. a ball falling down after its thrown up into the air c. a satellite orbiting earth d. a bat hitting a ball
Answer
# Answer:
D. a bat hitting a ball
# Explanation:
## Step1: Define contact force
A contact force is a force that occurs when two objects are in physical contact with each other.
## Step2: Analyze option A
Protons in the nucleus are held by nuclear - force, not a contact force as they are within the nucleus and not due to physical contact between separate objects.
## Step3: Analyze option B
A ball falling down after being thrown up is due to gravitational force. Gravity is a non - contact force that acts at a distance.
## Step4: Analyze option C
A satellite orbiting Earth is due to gravitational force between the Earth and the satellite, which is a non - contact force.
## Step5: Analyze option D
When a bat hits a ball, the bat and the ball are in physical contact with each other, and the force exerted by the bat on the ball is a contact force.