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Questions and Answers
What force acts on a charged balloon when it sticks to a wall?
What force acts on a charged balloon when it sticks to a wall?
What are the forces acting on a plastic bucket containing water held above ground level in a person's hand?
What are the forces acting on a plastic bucket containing water held above ground level in a person's hand?
Which two forces act on a rocket immediately after it leaves the launching pad?
Which two forces act on a rocket immediately after it leaves the launching pad?
What causes the rise of water in a dropper when the bulb is released after pressing?
What causes the rise of water in a dropper when the bulb is released after pressing?
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Why do the forces acting on a bucket of water held above ground not cause a change in its state of motion?
Why do the forces acting on a bucket of water held above ground not cause a change in its state of motion?
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Which of the following is an example of a push situation?
Which of the following is an example of a push situation?
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What type of force causes a change in the shape of an object?
What type of force causes a change in the shape of an object?
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What happens when the north pole of a magnet interacts with another north pole?
What happens when the north pole of a magnet interacts with another north pole?
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Which statement correctly describes the force applied by an archer when stretching her bow?
Which statement correctly describes the force applied by an archer when stretching her bow?
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To draw water from a well, what action must be taken on the rope?
To draw water from a well, what action must be taken on the rope?
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When clay is pressed between hands, what happens to its state?
When clay is pressed between hands, what happens to its state?
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What type of force is responsible for the motion of the released arrow from the bow?
What type of force is responsible for the motion of the released arrow from the bow?
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To move a loaded trolley, what do we need to do?
To move a loaded trolley, what do we need to do?
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What forces act on the arrow while it is moving towards its target?
What forces act on the arrow while it is moving towards its target?
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What type of force is applied by the archer to stretch the bow?
What type of force is applied by the archer to stretch the bow?
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What is the result of the force applied when squeezing a lemon?
What is the result of the force applied when squeezing a lemon?
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What type of force is responsible for the change in state of motion when an athlete jumps over a bar?
What type of force is responsible for the change in state of motion when an athlete jumps over a bar?
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What happens to the shape of a spring when a load is suspended from it?
What happens to the shape of a spring when a load is suspended from it?
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What is the effect of hammering on a hot piece of iron by a blacksmith?
What is the effect of hammering on a hot piece of iron by a blacksmith?
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What causes the attraction between a rubbed balloon and a wall?
What causes the attraction between a rubbed balloon and a wall?
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When taking out paste from a toothpaste tube, what type of force is applied?
When taking out paste from a toothpaste tube, what type of force is applied?
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Study Notes
Force and Motion
- To change the state of motion of an object, a force must be applied.
- Pushing and pulling are common ways to apply force.
- Examples of pushing: kicking a football and pushing a heavy box.
- Examples of pulling: opening a drawer and pulling water from a well.
Force and Shape Change
- Force can change the shape of an object.
- Examples: pressing clay between hands and squeezing a plastic bottle.
Types of Forces
- Contact Force: Force applied through direct contact, examples: pushing a door, pulling a rope.
- Non-Contact Force: Force applied without physical contact, examples: gravity pulling objects towards Earth, magnetic force attracting or repelling.
- Muscular Force: Force exerted by living beings, examples: humans pushing a car, animal pulling a cart.
Forces in Real-World Situations
- Archer and Bow: The archer applies muscular force to stretch the bow, which changes its shape. The arrow's motion is influenced by contact forces (from the bow) and non-contact forces (gravity and air friction).
- Squeezing Lemon: Muscular force changes the lemon's shape to extract juice.
- Toothpaste Tube: Muscular force applied to the tube changes its shape to extract toothpaste.
- Load on a Spring: The load exerts a force on the spring, changing its shape (stretching it).
- High Jump: The athlete exerts muscular force on the ground, propelling them upwards.
Forces in Everyday Objects
- Blacksmith Hammering: The blacksmith utilizes muscular force to change the shape of hot iron.
- Charged Balloon and Wall: Electrostatic force attracts the charged balloon to the uncharged wall.
Balanced Forces
- The forces acting on a plastic bucket held in the hand are: muscular force (upwards) and gravity (downwards).
- These forces balance each other, resulting in no change in the bucket's motion.
Forces on a Rocket
- The forces acting on a rocket immediately after launch are: gravity pulling it downwards and friction from the atmosphere resisting its upward motion.
Atmospheric Pressure
- Atmospheric pressure is the force exerted by the weight of air on the earth's surface.
- This pressure can force water into a dropper.
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