Force and Pressure 8 Assignment 04

Answers are at the end.

Mixed-Style Questions

1.

Statement: A force can act on an object without any interaction between two objects.

Is this true or false?

2.

Match the force type with its example:

Column A (Force Type)	Column B (Example)
A) Muscular force	1) A coin falls to the ground
B) Gravitational force	2) Kicking a football
C) Friction	3) A ball slows on the ground
D) Electrostatic force	4) A rubbed straw attracts paper

Provide the correct pairs (e.g., A-2, B-1, etc.).

3.

The force exerted by a magnet on another magnet without touching is an example of a ______ force.

4.

Statement: If two equal forces act on an object in opposite directions, the object will always move in the direction of the last applied force.

• Is this true or false?

5.

Why does a porter use a round piece of cloth on their head when carrying a heavy load? (Answer in 1-2 sentences.)

6.

Match the situation with the effect of force:

Column A (Situation)	Column B (Effect)
A) Pushing a ball on a table	1) Changes shape
B) Pressing a rubber ball	2) Starts motion
C) Flicking a hockey ball	3) Changes direction
D) Stopping a cricket ball	4) Decreases speed

Provide the correct pairs (e.g., A-2, B-1, etc.).

7.

When rubber baloon is filled with water, the rubber sheet bulges more when more water is added because the pressure increases with the ______ of the water column.

8.

Statement: Pressure is defined as force multiplied by the area on which it acts.

• Is this true or false?

9.

Name two non-contact forces mentioned in the chapter. (Answer in one sentence.)

10.

In a tug-of-war, the rope does not move when both teams pull equally hard. Explain why in terms of force. (Answer in 1-2 sentences.)

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Answers:

1. True/False: False
   
   • Explanation: Force requires interaction between at least two objects
2. Match the Following:
   • A-2 (Muscular force: Kicking a football)
   • B-1 (Gravitational force: Coin falls)
   • C-3 (Friction: Ball slows)
   • D-4 (Electrostatic force: Rubbed straw attracts paper)
3. Fill in the Blank: Non-contact force
   
   • Explanation: Magnetic force acts without contact
4. True/False: False
   
   • Explanation: Equal opposing forces result in a net force of zero, so the object does not move
5. Short Answer: A porter uses a cloth ring to increase the contact area with the load, reducing pressure on their head and making it easier to carry.
   
   • Explanation: Pressure = force/area
6. Match the Following:
   • A-2 (Pushing a ball: Starts motion)
   • B-1 (Pressing a ball: Changes shape)
   • C-3 (Flicking a ball: Changes direction)
   • D-4 (Stopping a ball: Decreases speed)
7. Fill in the Blank: Height
   
   • Explanation: Pressure increases with water column height
8. True/False: False
   
   • Explanation: Pressure = force/area, not force × area
9. Short Answer: Magnetic force and gravitational force are two non-contact forces mentioned in the chapter.
   
10. Short Answer: The rope does not move because the equal forces from both teams cancel each other out, resulting in a net force of zero.
    
    • Explanation: Equal opposing forces balance