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Questions and Answers
A book rests on a table. Which force is primarily responsible for preventing the book from moving downwards?
A book rests on a table. Which force is primarily responsible for preventing the book from moving downwards?
- Static friction between the book and table.
- Sliding friction between the book and table.
- The normal force exerted by the table on the book. (correct)
- The gravitational force exerted by the Earth on the book.
Two objects with masses $m_1$ and $m_2$ are separated by a distance $r$. According to the law of universal gravitation, if the distance between them is doubled, what happens to the gravitational force between them?
Two objects with masses $m_1$ and $m_2$ are separated by a distance $r$. According to the law of universal gravitation, if the distance between them is doubled, what happens to the gravitational force between them?
- It is reduced to one-fourth of its original value. (correct)
- It remains the same.
- It is doubled.
- It is reduced by half.
A car is moving at a constant velocity on a straight, level road. Which of the following statements is most likely true regarding the forces acting on the car?
A car is moving at a constant velocity on a straight, level road. Which of the following statements is most likely true regarding the forces acting on the car?
- The force of friction is greater than the applied force from the engine.
- There are no forces acting upon the car.
- The applied force from the engine is greater than the force of friction.
- The net force acting on the car is zero. (correct)
Which of the following scenarios involves fluid friction as the primary opposing force?
Which of the following scenarios involves fluid friction as the primary opposing force?
How does increasing the mass of an object affect the gravitational force between it and another object?
How does increasing the mass of an object affect the gravitational force between it and another object?
A heavy box is at rest on a horizontal floor. A person applies a force to the box, but it doesn't move. What type of friction is primarily acting on the box?
A heavy box is at rest on a horizontal floor. A person applies a force to the box, but it doesn't move. What type of friction is primarily acting on the box?
Consider two identical magnets. If the distance between them is tripled, what happens to the magnetic force between them?
Consider two identical magnets. If the distance between them is tripled, what happens to the magnetic force between them?
Which of the following is an example of a non-contact force?
Which of the following is an example of a non-contact force?
Flashcards
Force
Force
A push or pull on an object.
Contact Force
Contact Force
A push or pull between objects that are touching.
Non-Contact Force
Non-Contact Force
A push or pull between objects not touching .
Friction
Friction
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Static Friction
Static Friction
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Sliding Friction
Sliding Friction
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Fluid Friction
Fluid Friction
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Gravity
Gravity
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Study Notes
- Forces can change the motion of an object.
Contact and Non-Contact Forces
- Contact forces involve objects touching each other
- Non-contact forces act without direct contact.
- Essential questions include: What are some contact and non-contact forces? What is the law of universal gravitation? How does friction affect the motion of sliding objects?
Types of Forces
- A force is a push or pull on an object.
- Contact Force: A push or pull on one object by another touching it.
- Example: Pushing a container or pressing computer keys.
- Non-Contact Force: A push or pull on one object by another without touching it.
- Examples: Gravity, magnetic forces, and electrical forces.
Types of Friction
- Friction resists the motion of two touching objects.
- Static Friction: Prevents objects from sliding past each other.
- Sliding Friction: Opposes the motion of objects sliding past each other.
- Fluid Friction: Friction between a surface and a fluid like water or air (air resistance)
Static vs. Sliding Friction
- Static friction is equal to 0N when the static friction is -100N and the applied force is 100N.
- Sliding friction is present when there is relative motion
Effect of Mass and Distance on Gravity
- Gravity: An attractive force between all objects with mass.
- Mass: Amount of matter in an object.
- A change in mass affects gravitational pull, a greater mass meaning more gravitational pull.
- A change in distance affects gravitational pull, with greater distance reducing gravitational pull.
Weight vs. Mass
- Weight: The amount of gravitational force on an object, measured in newtons.
- For an astronaut with a weight of 539N and a mass of 55kg on Earth, weight would change on the moon.
Electrical Forces
- Static Charge: Unbalanced positive or negative charge on an object.
- Opposite charges attract each other.
- The same charges repel each other.
- The more charge, the greater the electrical force (attractive or repulsive).
- The more distance, the less electrical force.
Magnetic Forces
- Magnet: Object that attracts metal iron.
- Magnetic Pole: Where the force on a magnet is strongest.
- Opposite poles attract each other.
- The same poles repel each other.
- Magnetic strength increases with magnet size.
- Magnetic force weakens with distance.
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Description
Explore the effects of forces on object motion, differentiating between contact forces requiring physical touch and non-contact forces acting at a distance. Understand universal gravitation and the impact of friction, including static, sliding, and fluid friction.
