Give a brief response to the following questions. 1 Why does dust fly off, when a hanging carpet is beaten with a stick? ② If your hands are wet and no towel is handy, you can remove some of the excess water by shaking them. Why does this work? ③ Why a balloon filled with air move forward, when its air is released? 4 Why does a hose pipe tend to move, backward when the fireman directs a powerful stream of water towards fire? 5 Your car is stuck in wet mud. Some students on their way to class see your predicament and help out by sitting on the trunk of your car to increase its traction. Why does this help? ⑥ How does friction help you walk? Is it kinetic friction or static friction? ✔ The parking brake on a car causes the rear wheels to lock up. What would be the likely consequence of applying the parking brake in a car that is in rapid motion? ⑤ Why is the surface of a conveyor belt made rough? • Why does a boatman tie his boat to a pillar before allowing the passengers to step on the river bank? 10 In uniform circular motion, is the velocity constant? Is the acceleration constant? Explain. 11 You tie a brick to the end of a rope and whirl the brick around you in a horizontal circle. Describe the path of the brick after you suddenly let go of the rope. 12 Why is the posted speed for a turn lower than the speed limit on most highways?

Dust flies off when a hanging carpet is beaten with a stick due to the force of the impact. The force causes the dust particles, which are loosely attached to the carpet fibers, to dislodge and become airborne.

Shaking wet hands works to remove excess water due to centrifugal force. As you shake your hands, the water droplets are forced outwards and off your hands.

A balloon filled with air moves forward when its air is released due to Newton's third law of motion: for every action, there is an equal and opposite reaction. The air rushing out of the balloon propels it in the opposite direction.

A hose pipe tends to move backward when a fireman directs a powerful stream of water towards fire due to the conservation of momentum. The water rushing out of the hose in one direction causes the hose to move in the opposite direction.

Students sitting on the trunk of a car stuck in wet mud helps increase its traction because the added weight increases the friction between the tires and the ground, making it easier for the car to move.

Friction helps you walk by providing a force that opposes your foot sliding. It is static friction that prevents your foot from sliding when you take a step.

If the parking brake is applied in a car that is in rapid motion, the rear wheels would lock up and skid, potentially causing the car to spin out of control.

The surface of a conveyor belt is made rough to increase friction, which helps to prevent items from sliding off.

A boatman ties his boat to a pillar before allowing passengers to step on the river bank to prevent the boat from drifting away due to the water's current or wind.

In uniform circular motion, the speed is constant but the velocity is not, because velocity is a vector quantity that includes both speed and direction. The acceleration is also not constant, as it is always directed towards the center of the circle.

If you let go of the rope, the brick would continue to move in a straight line in the direction it was moving at the moment you let go, due to Newton's first law of inertia.

The posted speed for a turn is lower than the speed limit on most highways because taking a turn at high speed can cause a vehicle to skid or roll over due to the centrifugal force.