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Questions and Answers
A book rests on a table. Which force is primarily responsible for preventing the book from sliding off the table?
A book rests on a table. Which force is primarily responsible for preventing the book from sliding off the table?
- Static Friction (correct)
- Fluid Friction
- Gravitational Force
- Sliding Friction
If the distance between two objects is doubled, how does this affect the gravitational force between them, assuming their masses remain constant?
If the distance between two objects is doubled, how does this affect the gravitational force between them, assuming their masses remain constant?
- The gravitational force is doubled.
- The gravitational force is reduced to one-quarter. (correct)
- The gravitational force is reduced to one-half.
- 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?
- A magnet attracting a metal paper clip. (correct)
- A person pushing a box across the floor.
- Air resistance slowing down a parachute.
- Friction between a sled and the snow.
An astronaut has a mass of 60 kg. What remains the same when the astronaut is on the moon versus on Earth?
An astronaut has a mass of 60 kg. What remains the same when the astronaut is on the moon versus on Earth?
A swimmer is moving through the water. Which type of friction primarily opposes their motion?
A swimmer is moving through the water. Which type of friction primarily opposes their motion?
A car is accelerating from rest. As its speed increases, what happens to the force of friction between the tires and the road, assuming no wheel slip?
A car is accelerating from rest. As its speed increases, what happens to the force of friction between the tires and the road, assuming no wheel slip?
Two objects have masses $m_1$ and $m_2$, respectively. If both masses are doubled, how is the gravitational force between them affected?
Two objects have masses $m_1$ and $m_2$, respectively. If both masses are doubled, how is the gravitational force between them affected?
A box is pushed with a force of 150 N, but it doesn't move. What can be said about the static friction acting on the box?
A box is pushed with a force of 150 N, but it doesn't move. What can be said about the static friction acting on the box?
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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Gravity
Gravity
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Weight
Weight
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Study Notes
- Forces change the motion of an object.
Gravity and Friction
- What are some contact forces and some non-contact forces?
- What is the law of universal gravitation?
- How does friction affect the motion of two objects sliding past each other?
Types of Forces
- A force is a push or a pull on an object.
- Forces are measured in newtons (N).
Contact Force
- A push or pull on one object by another that is touching it.
- Examples including pushing a container, pressing on computer keys and friction
Non-Contact Force
- A push or pull on one object by another without touching it.
- Examples are gravity, magnetic and electrical
Types of Friction
- Friction is a force that 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
- Exists between a surface and a fluid such as water
Gravity
- Is an attractive force that exists between all objects that have mass.
Mass
- Amount of matter in an object.
Weight
- The amount of gravitational force exerted on an object.
- Weight as a force is measured in newtons (N)
Static Charge
- An unbalanced positive or negative charge on an object
- Opposite charges attract each other.
- The same charges repel each other.
Variables that affect electric charge
- Amount of charge, so more charge creates stronger electrical force
- Distance, so the more distance creates less electric charge
Magnet
- An Object that attracts metal iron.
Magnetic Pole
- A place on a magnet where the force it applies is the strongest.
- Opposite poles attract each other
- The same poles repel each other
Variables that affect magnetic strength
- Size of magnet
- Distance, so the further away the magnets are the weaker the magnetic force
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