Question

1. name three forces involved in brushing your teeth.
2. choose three forces from table 1 on the first page of this section. for each force, give three examples from your daily experiences. share your answers with a classmate and add any of his or her examples that you find interesting.
3. what might be some of the advantages of using many different common names for forces when scientists agree that there are only four fundamental types? what might be some of the disadvantages of using common names?

Explanation:

For Question 3:

Forces in teeth brushing come from contact, friction, and muscle action.

For Question 4:

(Note: Since Table 1 is not provided, this uses standard fundamental forces as examples)

1. Gravitational force: Acts on all objects with mass.
2. Electromagnetic force: Governs interactions between charged particles.
3. Strong nuclear force: Holds atomic nuclei together.

For Question 5:

Common force names are intuitive for daily use, but can be imprecise. Scientists use fundamental forces for universal consistency.

Answer:

1. Question 3:

• Frictional force (between brush bristles and teeth)
• Applied force (from your hand on the brush)
• Normal force (teeth pushing back on brush bristles)

1. Question 4 (example fundamental forces):

• Gravitational force: 1) A ball falling to the ground, 2) The Moon orbiting the Earth, 3) Rain dropping from clouds
• Electromagnetic force: 1) A magnet sticking to a fridge, 2) Static electricity sticking a balloon to hair, 3) A battery powering a phone
• Strong nuclear force: 1) Holding protons together in a helium nucleus, 2) Keeping the nucleus of a carbon atom stable, 3) Binding particles in a uranium nucleus

1. Question 5:

Advantages of common names: 1) Easy to understand for everyday situations, 2) Relate directly to observable experiences, 3) Require no specialized scientific knowledge to use
Disadvantages of common names: 1) Can be ambiguous (different people may mean different things), 2) Do not account for the underlying universal physical principles, 3) Cannot be used to explain phenomena across different scientific contexts