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Questions and Answers
Which of the following best describes the relationship between mass and gravitational force?
Which of the following best describes the relationship between mass and gravitational force?
- Mass has no effect on gravitational force.
- As mass increases, gravitational force decreases.
- As mass decreases, gravitational force increases proportionally.
- As mass increases, gravitational force increases proportionally. (correct)
A box is sitting at rest on a ramp. Which type of friction is primarily responsible for preventing the box from sliding down the ramp?
A box is sitting at rest on a ramp. Which type of friction is primarily responsible for preventing the box from sliding down the ramp?
- Sliding friction
- Rolling friction
- Fluid friction
- Static friction (correct)
Which of the following is an example of a non-contact force?
Which of the following is an example of a non-contact force?
- Friction
- Gravity (correct)
- Pushing a box
- Applied force
Two objects are separated by a certain distance. If the distance between them is doubled, how does the gravitational force between them change?
Two objects are separated by a certain distance. If the distance between them is doubled, how does the gravitational force between them change?
A book is pushed across a table with a force of 20 N, and the force of sliding friction is 5 N. What is the net force acting on the book?
A book is pushed across a table with a force of 20 N, and the force of sliding friction is 5 N. What is the net force acting on the book?
Which of the following factors affects the magnitude of fluid friction on an object?
Which of the following factors affects the magnitude of fluid friction on an object?
How does the amount of surface area affect friction?
How does the amount of surface area affect friction?
Person A is standing still, while Person B is sliding down a playground slide. How does friction apply to them?
Person A is standing still, while Person B is sliding down a playground slide. How does friction apply to them?
An astronaut has a weight of 800N on Earth. On the moon, where the gravitational field strength is approximately 1/6 of Earth's, what would the astronaut's weight be?
An astronaut has a weight of 800N on Earth. On the moon, where the gravitational field strength is approximately 1/6 of Earth's, what would the astronaut's weight be?
A car is traveling at a constant velocity on a straight, level road. Which of the following statements best describes the forces acting on the car?
A car is traveling at a constant velocity on a straight, level road. Which of the following statements best describes the forces acting on the car?
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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Mass
Mass
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Gravity and Mass
Gravity and Mass
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Study Notes
- Forces change the motion of an object.
Types of Forces
- A force is a push or a pull on an object, and it is measured in Newtons (N).
- There are two types of forces: contact and non-contact.
Contact Force
- A contact force is a push or pull on one object by another that is touching it.
- Examples include pushing on a container, pressing on computer keys, and friction.
Non-Contact Force
- A non-contact force is a push or pull on one object by another without touching it.
- Examples include gravity, magnetic, and electrical forces.
Friction
- Friction is a force that resists the motion of two objects that are touching.
- There are three types of friction: static, sliding, and fluid.
Static Friction
- Static friction prevents objects from sliding past each other.
- With equal and opposite applied force and static friction, the net force is zero.
Sliding Friction
- Sliding friction opposes the motion of objects sliding past each other.
- When applied force exceeds sliding friction, the net force results in motion.
Fluid Friction
- Fluid friction occurs between a surface and a fluid such as water or air (air resistance).
Gravity
- Gravity is an attractive force that exists between 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 and 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, assuming her mass remained constant.
Static Charge
- Static charge is an unbalanced positive or negative charge on an object.
- Opposite charges attract each other, while the same charges repel each other.
- The more charge, the greater the electrical force (attraction or repulsion).
- The more distance, the less electrical force.
Magnetism
- A magnet is an object that attracts metal iron.
- A magnetic pole is a place on a magnet where the force it applies is the strongest.
- Opposite poles (charges) attract each other, and the same poles (charges) repel each other.
- Magnetic strength is affected by the size of the magnet: the further away the magnets are, the weaker the magnetic force.
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Description
Explore the fundamental concepts of forces, including contact and non-contact forces such as gravity, magnetism, and electrical forces. Learn about friction as a force resisting motion between objects. Discover the types of friction: static, sliding, and fluid.
