Podcast
Questions and Answers
A book rests on a table. Which force prevents the book from moving?
A book rests on a table. Which force prevents the book from moving?
- Sliding friction
- Fluid friction
- Static friction (correct)
- Applied force
Which of the following scenarios involves a non-contact force?
Which of the following scenarios involves a non-contact force?
- A carpenter hammering a nail into a piece of wood.
- A leaf falling from a tree. (correct)
- A hockey player striking a puck.
- A crane lifting a steel beam.
Which situation exemplifies fluid friction?
Which situation exemplifies fluid friction?
- A boat moving through water. (correct)
- Two tectonic plates grinding against each other.
- A car's tires rolling on a concrete road.
- A box sliding across a wooden floor.
Two objects with mass $m_1$ and $m_2$ are separated by a distance $r$. If the mass of each object is doubled and the distance between them is also doubled, how does the gravitational force between them change?
Two objects with mass $m_1$ and $m_2$ are separated by a distance $r$. If the mass of each object is doubled and the distance between them is also doubled, how does the gravitational force between them change?
A satellite maintains a stable orbit around Earth. If the satellite were moved to a higher orbit, what would happen to the gravitational force between the Earth and the satellite?
A satellite maintains a stable orbit around Earth. If the satellite were moved to a higher orbit, what would happen to the gravitational force between the Earth and the satellite?
An astronaut has a mass of 55 kg. If their weight on Earth is 539 N, which of the following would change if they were on the Moon?
An astronaut has a mass of 55 kg. If their weight on Earth is 539 N, which of the following would change if they were on the Moon?
Consider a hockey puck sliding across an ice rink. Which of the following forces is primarily responsible for slowing the puck down?
Consider a hockey puck sliding across an ice rink. Which of the following forces is primarily responsible for slowing the puck down?
A box is being pushed across a rough floor. A student measures the applied force to be 300 N, but the box moves with a constant velocity. What can be concluded about the force of friction?
A box is being pushed across a rough floor. A student measures the applied force to be 300 N, but the box moves with a constant velocity. What can be concluded about the force of friction?
Flashcards
Force
Force
A push or pull on an object, measured in Newtons (N).
Contact Force
Contact Force
A force that requires direct contact between objects.
Non-Contact Force
Non-Contact Force
A force that acts between objects without direct contact.
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
Types of Forces
- A force is a push or pull on an object, measured in Newtons (N).
- There are two types of forces: contact and non-contact forces.
Contact Force
- Contact force happens when one object touches another.
- Examples include pushing a container, pressing on computer keys, and friction
Non-Contact Force
- Non-contact force occurs when objects don't have to be touching each other
- Examples include gravity, magnetic, and electrical forces
Friction
- Friction resists motion of two objects that are touching
Static Friction
- Prevents objects from sliding past each other
Sliding Friction
- Sliding friction opposes the motion of objects sliding past each other
Fluid Friction
- Fluid friction occurs between a surface and a fluid, like water or air (air resistance)
Gravity
- Gravity is an attractive force that exists between all objects that have mass
- Mass is the amount of matter in an object
- Greater mass results in greater gravitational pull
- Greater distance results in less gravitational pull
Weight vs. Mass Example
- An astronaut weighs 539N and has a mass of 55 kg on Earth
- Weight would change on the moon, not mass
Static Charge
- Static charge is unbalanced positive or negative charge on an object
- Opposite charges attract each other
- The same charges repel each other
- Variables affecting electric charge are the amount of charge and distance
- More charge equals greater electric force attraction or repulsion
- More distance equals less electron force
Magnet
- A magnet is an object that attracts metal iron
- The magnetic pole is the place on a magnet where the force it applies is the strongest
- Opposite poles charges attract each other
- The same pole charges repel each other
- Variables affecting magnetic strength are the size of the magnet and distance
- The further away the magnets are, the weaker the magnetic force
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Description
Explore the different types of forces including contact, non-contact and friction. Learn the difference between static and sliding friction. Understand how gravity affects objects with mass and its role as a fundamental force.
