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Questions and Answers
A box is resting on a . Which type of friction is primarily responsible for preventing the box from moving unless a sufficient horizontal force is applied?
A box is resting on a . Which type of friction is primarily responsible for preventing the box from moving unless a sufficient horizontal force is applied?
- Sliding friction
- Static friction (correct)
- Fluid friction
- Gravitational force
Consider a scenario where a is driving down a highway. What type of friction is primarily acting against the car's motion due to air resistance?
Consider a scenario where a is driving down a highway. What type of friction is primarily acting against the car's motion due to air resistance?
- Rolling friction
- Sliding friction
- Static friction
- Fluid friction (correct)
Imagine an astronaut is floating in space, far away from any planet or star. According to the law of universal gravitation, what can be said about the gravitational force acting on the astronaut?
Imagine an astronaut is floating in space, far away from any planet or star. According to the law of universal gravitation, what can be said about the gravitational force acting on the astronaut?
- The gravitational force is strong due to the astronaut's mass.
- The gravitational force is zero because there is no contact.
- The gravitational force is constant, pulling equally in all directions.
- The gravitational force is weak but measurable.
- The gravitational force is negligible because of the large distance from other objects with mass (correct)
Two objects with different masses are dropped simultaneously from the same height in a vacuum (no air resistance). Which statement is true?
Two objects with different masses are dropped simultaneously from the same height in a vacuum (no air resistance). Which statement is true?
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?
If the distance between two objects is doubled, how does this change the gravitational force between them?
If the distance between two objects is doubled, how does this change the gravitational force between them?
What distinguishes weight from mass?
What distinguishes weight from mass?
A book rests on a table. Which of the following forces is an example of a contact force?
A book rests on a table. Which of the following forces is an example of a contact force?
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 object is sliding across a rough surface. If the normal force is 50 N and the coefficient of sliding friction between the object and the surface is 0.3, what is the force of sliding friction?
An object is sliding across a rough surface. If the normal force is 50 N and the coefficient of sliding friction between the object and the surface is 0.3, what is the force of sliding 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.
Noncontact Force
Noncontact 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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Mass
Mass
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Weight
Weight
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Study Notes
- Forces can change the motion of an object.
Gravity and Friction
- Contact forces and non-contact forces exist.
- The law of universal gravitation is important.
- Friction affects the motion of two objects sliding past each other.
Types of forces
- 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 when touching.
- Examples include pushing a container, pressing on computer keys, and friction.
Noncontact Force
- A push or pull on one object by another without touching.
- Examples include gravity, magnetic, and electrical forces.
Types of Friction
- Friction is a force that 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 occurs between a surface and a fluid such as water or air (air resistance).
Static Friction vs Sliding Friction
- Static friction has zero net force
Gravity
- An attractive force that exists 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 is the amount of gravitational force exerted on an object.
- Weight is measured in newtons (N).
- If an astronaut weighs 539N and has a mass of 55kg on Earth, her weight would be less 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.
- Amount of charge: The more charge the greater the electrical force (attraction or repulsion).
- Distance: The more distance the less electrical force.
Magnetic Forces
- 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.
- Size of the magnet influences magnetic strength.
- Distance: The further away the magnets are the weaker the magnetic force.
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Description
Explore the fundamental concepts of forces and motion, including contact and non-contact forces like gravity and friction. Learn about the law of universal gravitation and how friction affects the movement of objects. Understand the different types of forces and how they are measured.
