23. what is the difference between mass and weight? 24. tell me what it means for an interaction/force to be non - contact and give an example. 25. draw and label all forces: a book sliding across a table to the right and slowing down 26. draw and label all forces: a skydiver falling at constant velocity 27. draw and label all forces: a ball being thrown upward

Question

Accepted Answer

### 23.
# Brief Explanation:
Mass is the amount of matter in an object, a scalar quantity measured in kilograms (kg). Weight is the force exerted on an object due to gravity, a vector quantity measured in newtons (N), calculated as $W = mg$ where $m$ is mass and $g$ is gravitational - acceleration.
# Answer:
Mass is the amount of matter, a scalar. Weight is the gravitational force on an object, a vector.

### 24.
# Brief Explanation:
A non - contact force is an interaction that occurs without physical contact between objects. An example is the gravitational force between the Earth and the Moon or the magnetic force between two magnets not touching.
# Answer:
A non - contact force acts without physical contact. Example: gravitational or magnetic force.

### 25.
# Brief Explanation:
The forces acting on the book are the force of gravity ($F_g$) pulling it downwards, the normal force ($F_N$) exerted by the table upwards perpendicular to the surface, and the frictional force ($F_f$) acting to the left (opposite to the direction of motion) which causes it to slow down.
# Answer:
Draw a downward arrow labeled $F_g$, an upward arrow labeled $F_N$ of equal length (since the book is not moving vertically), and a left - ward arrow labeled $F_f$.

### 26.
# Brief Explanation:
The skydiver falling at constant velocity is in equilibrium. The force of gravity ($F_g$) acts downwards and the air resistance force ($F_{air}$) acts upwards with equal magnitude.
# Answer:
Draw a downward arrow labeled $F_g$ and an upward arrow labeled $F_{air}$ of equal length.

### 27.
# Brief Explanation:
When a ball is thrown upward, the force of gravity ($F_g$) acts downwards throughout the motion. There is also an initial upward force ($F_{throw}$) when it is being thrown, but once it leaves the hand, only the gravitational force and air resistance (neglected in simple cases, but if considered, acts in the opposite direction of motion) act on it.
# Answer:
During the throw: Draw an upward arrow labeled $F_{throw}$ and a downward arrow labeled $F_g$. After leaving the hand: Draw only a downward arrow labeled $F_g$ (or $F_g$ and a small downward - acting air resistance arrow if considering air resistance).

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Question

Explanation:

23.

Answer:

24.