Podcast
Questions and Answers
Which of the following scenarios best exemplifies a non-contact force?
Which of the following scenarios best exemplifies a non-contact force?
- A balloon sticking to a wall after being rubbed against hair. (correct)
- A kayaker paddling through a river.
- A student pushing a book across a desk surface.
- A carpenter hammering a nail into a wooden plank.
A box is at rest on an inclined plane. Which type of friction is primarily responsible for preventing the box from sliding down the plane?
A box is at rest on an inclined plane. Which type of friction is primarily responsible for preventing the box from sliding down the plane?
- Rolling friction
- Fluid friction
- Static friction (correct)
- Sliding friction
A car is traveling down a highway. What type of friction is acting against the car's tires?
A car is traveling down a highway. What type of friction is acting against the car's tires?
- Sliding friction
- Fluid friction
- Static friction (correct)
- Kinetic friction
Imagine two objects, Object A and Object B, both with a mass of 10kg. If the mass of Object A is doubled, what happens to the gravitational force between them, assuming the distance remains constant?
Imagine two objects, Object A and Object B, both with a mass of 10kg. If the mass of Object A is doubled, what happens to the gravitational force between them, assuming the distance remains constant?
An astronaut is on a planet with twice the mass and twice the radius of Earth. How does the astronaut's weight on this planet compare to their weight on Earth?
An astronaut is on a planet with twice the mass and twice the radius of Earth. How does the astronaut's weight on this planet compare to their weight on Earth?
Two objects with different masses are dropped simultaneously from the same height in a vacuum. What can be said about their acceleration?
Two objects with different masses are dropped simultaneously from the same height in a vacuum. What can be said about their acceleration?
A spacecraft is traveling from Earth to the Moon. How does the gravitational force exerted on the spacecraft by the Earth change as it moves farther away?
A spacecraft is traveling from Earth to the Moon. How does the gravitational force exerted on the spacecraft by the Earth change as it moves farther away?
An object is moving at a constant velocity. Which of the following statements is most likely true regarding the forces acting on the object?
An object is moving at a constant velocity. Which of the following statements is most likely true regarding the forces acting on the object?
Flashcards
Force
Force
A push or pull on an object.
Contact Force
Contact Force
A force that requires direct contact between objects.
Noncontact Force
Noncontact Force
A force that acts between objects that are not directly touching.
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.
Gravity and Friction
- Contact forces and non-contact forces exist.
- There is a law of universal gravitation.
- Friction affects the motion of two objects sliding past each other.
Types of Forces
- Force is a push or a pull on an object.
- There are two types of forces: contact and noncontact.
Contact Force
- A push or pull on one object by another that is touching it.
- Examples include pushing a container, pressing on computer keys, and friction.
Noncontact Force
- A push or pull on one object by another without touching it.
- Examples include gravity, magnetic force, and electrical force.
Types of Friction
- Friction is a force that resists the motion of two objects that are touching.
- The three types of friction are static, sliding, and fluid friction.
Static Friction
- Prevents objects from sliding past each other.
- When static friction and applied force have equal magnitude the net force equals 0N
Sliding Friction
- Opposes the motion of objects sliding past each other.
- When sliding friction has a lower magnitude than the applied force the net force will be greater than 0N
Fluid Friction
- Friction between a surface and a fluid such as water or air, otherwise known as air resistance.
Gravity and Mass
- Gravity is an attractive force that exists between all objects that have mass.
- Mass is the amount of matter in an object.
- The more the mass, the more the gravitational pull.
- The greater the distance, the less the gravitational pull.
Weight vs. Mass
- Weight is the amount of gravitational force exerted on an object and is measured in newtons.
- If an astronaut weighs 539N and has a mass of 55kg on Earth, her weight would be less if she was on the moon.
Electrical Non-Contact Force
- Static Charge is unbalanced negative or positive charge on an object.
- Opposite charges attract each other.
- The same charges repel each other.
- The more charge, the greater the electrical force (attraction or repulsion).
- The more distance, the less electrical force.
Magnetic Non-Contact Force
- 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.
- The same poles (charges) repel each other.
- The size of magnet and distance, the further away the magnets are the weaker the magnetic force, affect magnetic strength.
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Description
Explore forces and their impact on motion, covering contact and non-contact forces such as gravity and friction. Learn about the law of universal gravitation and different types of friction, including static, sliding, and fluid friction, as well as how they affect object movement.
