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Questions and Answers
A book rests on a table. Which of the following forces is primarily responsible for preventing the book from moving downwards?
A book rests on a table. Which of the following forces is primarily responsible for preventing the book from moving downwards?
- Static friction between the book and the table.
- The gravitational force exerted by the Earth on the book.
- The normal force exerted by the table on the book. (correct)
- Sliding friction between the book and the table.
A car is driving down a highway. What type of friction is primarily acting on the tires?
A car is driving down a highway. What type of friction is primarily acting on the tires?
- Magnetic friction
- Static friction (correct)
- Sliding friction
- Fluid friction
Two objects with masses $m_1$ and $m_2$ are separated by a distance $r$. According to the law of universal gravitation, what happens to the gravitational force between them if the distance $r$ is doubled?
Two objects with masses $m_1$ and $m_2$ are separated by a distance $r$. According to the law of universal gravitation, what happens to the gravitational force between them if the distance $r$ is doubled?
- The gravitational force is reduced to one-fourth. (correct)
- The gravitational force is doubled.
- The gravitational force is halved.
- The gravitational force is quadrupled.
Which of the following is an example of a non-contact force?
Which of the following is an example of a non-contact force?
An astronaut has a mass of 60 kg. What happens to the astronaut's mass when they travel to the moon?
An astronaut has a mass of 60 kg. What happens to the astronaut's mass when they travel to the moon?
A hockey puck slides across the ice, gradually slowing down. Which type of friction is primarily responsible for its deceleration?
A hockey puck slides across the ice, gradually slowing down. Which type of friction is primarily responsible for its deceleration?
If an object experiences balanced forces, what can be said about its motion?
If an object experiences balanced forces, what can be said about its motion?
Consider two scenarios: In scenario 1, a small car is traveling at 30 mph, and in scenario 2, a large truck is traveling at 30 mph. Which of the following statements is true regarding the force required to stop each vehicle in the same amount of time?
Consider two scenarios: In scenario 1, a small car is traveling at 30 mph, and in scenario 2, a large truck is traveling at 30 mph. Which of the following statements is true regarding the force required to stop each vehicle in the same amount of time?
Flashcards
Force
Force
A push or pull on an object, measured in newtons (N).
Contact Force
Contact Force
A force requiring direct contact between objects.
Non-Contact Force
Non-Contact Force
A force that acts without direct contact between objects.
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 change the motion of an object.
Gravity & Friction
- Contact forces and non-contact forces both exist.
- The law of universal gravitation is a factor.
- Friction affects the morion when two objects are sliding against one another.
Types of Forces
- A force is a push or pull on an object.
- Forces are measured in newtons (N).
- Contact force is a push or a pull on one object by another that is touching it, like pushing a container, pressing on computer keys, or friction.
- Non-contact force is a push or pull on one object by another without touching it, like gravity, magnetic, and electrical forces.
Types of Friction
- Friction resists the motion of two objects that are touching.
- Static friction prevents objects from sliding past each other.
- Sliding friction opposes the motion of objects sliding past each other.
- Fluid friction acts between a surface and a fluid, such as water or air (air resistance).
Static vs. Sliding Friction
- Static friction example: If the static friction is -100N and the applied force is 100N, the net force is 0N
- Sliding friction example: If the sliding friction is -70N and the applied force is 200N, the net force is equal to the calculation of 200N-70N.
Gravity
- Gravity is an attractive force between all objects that have mass.
- Mass is the amount of matter in an object.
- The more mass, the more gravitational pull.
- The greater the distance, the less gravitational pull.
Weight vs. Mass
- Weight varies based on gravitational pull.
- Mass is constant regardless of location.
- An astronaut weighs 539N and has a mass of 55kg on Earth, their weight would be less on the moon.
Electrical force
- Static Charge: unbalanced positive or negative charge on an object.
- Opposite charges attract each other.
- The same charges repel each other.
- Amount of charge affects electric charge: The more charge the greater the electrical force (attraction or repulsion).
- Distance affects electric charge: the more distance the less electrical force.
Magnetic Force
- Magnet: object that attracts metal iron
- Magnetic Pole: place on a magnet where the force it applies is the strongest
- Opposite poles (charges) attract each other
- The same poles (charges) repel each other
- The Size of the Magnet affect magnetic strength.
- The Distance: The further away the magnets are the weaker the magnetic force
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Description
Discover the relationship between forces and motion. Explore contact and non-contact forces, including gravity, friction, and their effects. Understand the different types of friction, such as static, sliding and fluid friction.
