Educational worksheet on friction, including questions and images to identify forces like friction and air resistance.

Task: Solve the worksheet on friction and explain the solution.

#### Part 1: Fill in the blanks with the words given in the word bank.

The word bank provided is:
- slow down
- air resistance
- frictional force
- friction
- larger
- greater

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1. __________ is the force which opposes motion when two surfaces are in contact.
- Answer: Frictional force
- Explanation: Friction is the force that resists the relative motion of solid surfaces, fluid layers, or material elements sliding against each other. It opposes motion when two surfaces are in contact.

2. Friction can __________ or stop moving objects.
- Answer: Slow down
- Explanation: Friction acts as a resistive force, which can reduce the speed of a moving object or eventually bring it to a stop.

3. Friction is also known as __________.
- Answer: Friction
- Explanation: This is a straightforward question. Friction is the term used to describe the resistive force between surfaces in contact.

4. Friction is __________ between rough surfaces than between smooth surfaces.
- Answer: Greater
- Explanation: Rough surfaces have more irregularities, which increase the contact area and the forces of attraction between the surfaces, leading to greater friction compared to smooth surfaces.

5. __________ is friction between the surface of the object and the air.
- Answer: Air resistance
- Explanation: Air resistance is a type of friction that occurs when an object moves through the air. It is the force that opposes the motion of the object due to the interaction between the object's surface and the air molecules.

6. An object with __________ surface area will experience greater air resistance.
- Answer: Larger
- Explanation: The surface area of an object affects the amount of air resistance it experiences. A larger surface area means more interaction with air molecules, resulting in greater air resistance.

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#### Part 2: Which type of force is present in the following pictures?

1. First Picture (Person pushing a table):
- Forces acting: The person is applying a pushing force on the table.
- Type of force: Friction
- Explanation: When the person pushes the table, there is friction between the table's legs and the floor. This friction opposes the motion of the table.

2. Second Picture (Parachute in the air):
- Forces acting: The parachute is slowing down the descent of the person due to its interaction with the air.
- Type of force: Air resistance
- Explanation: The parachute increases the surface area exposed to the air, which creates significant air resistance. This force opposes the downward motion caused by gravity.

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Final Answers:

#### Part 1:
1. Frictional force
2. Slow down
3. Friction
4. Greater
5. Air resistance
6. Larger

#### Part 2:
1. Friction
2. Air resistance

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Final Answer Box:
\boxed{
\begin{array}{l}
\text{1. Frictional force} \\
\text{2. Slow down} \\
\text{3. Friction} \\
\text{4. Greater} \\
\text{5. Air resistance} \\
\text{6. Larger} \\
\text{Picture 1: Friction} \\
\text{Picture 2: Air resistance}
\end{array}
}