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Questions and Answers
A spacecraft is traveling through deep space, far from any significant gravitational sources. If the spacecraft suddenly doubles its mass by collecting space debris, what effect would this have on the gravitational force it exerts on a nearby object?
A spacecraft is traveling through deep space, far from any significant gravitational sources. If the spacecraft suddenly doubles its mass by collecting space debris, what effect would this have on the gravitational force it exerts on a nearby object?
- There would be no change in the gravitational force.
- The gravitational force would quadruple.
- The gravitational force would be halved.
- The gravitational force would double. (correct)
A box is initially at rest on a rough horizontal surface. A gradually increasing horizontal force is applied to the box. What type of friction primarily opposes the applied force before the box starts to move?
A box is initially at rest on a rough horizontal surface. A gradually increasing horizontal force is applied to the box. What type of friction primarily opposes the applied force before the box starts to move?
- Rolling friction
- Static friction (correct)
- Fluid friction
- Sliding friction
Two identical blocks are connected by a string. One block is placed on a flat surface while the second hangs off the side, connected by a pulley. Considering the mass of the blocks and gravity, what happens to the frictional force as mass is transferred from the block on the surface to the hanging block?
Two identical blocks are connected by a string. One block is placed on a flat surface while the second hangs off the side, connected by a pulley. Considering the mass of the blocks and gravity, what happens to the frictional force as mass is transferred from the block on the surface to the hanging block?
- The frictional force will fluctuate randomly due to variations in the mass transfer rate.
- The frictional force will remain constant because the total mass of the system is constant.
- The frictional force will increase due to the increase in weight.
- The frictional force will decrease because the normal force on the block on the surface decreases. (correct)
A charged balloon is brought near a neutral wall and sticks to it. Which of the following explains why this happens?
A charged balloon is brought near a neutral wall and sticks to it. Which of the following explains why this happens?
A small, positively charged object is placed near a larger, negatively charged object. Which of the following statements accurately describes the forces between them regarding magnitude and direction?
A small, positively charged object is placed near a larger, negatively charged object. Which of the following statements accurately describes the forces between them regarding magnitude and direction?
A strong magnet is brought near a stationary aluminum can. Even though aluminum is not ferromagnetic, the can is observed to move slightly towards the magnet. Which of the following explains this phenomenon?
A strong magnet is brought near a stationary aluminum can. Even though aluminum is not ferromagnetic, the can is observed to move slightly towards the magnet. Which of the following explains this phenomenon?
Consider a scenario where a car is moving at a constant velocity on a level road. Which of the following statements best describes the relationship between the driving force and the opposing forces (friction, air resistance)?
Consider a scenario where a car is moving at a constant velocity on a level road. Which of the following statements best describes the relationship between the driving force and the opposing forces (friction, air resistance)?
Two objects with different masses are dropped simultaneously from the same height in a vacuum. Which of the following statements is true regarding their acceleration and time of impact?
Two objects with different masses are dropped simultaneously from the same height in a vacuum. Which of the following statements is true regarding their acceleration and time of impact?
A positively charged particle is moving horizontally through a uniform magnetic field directed vertically upwards. What is the direction of the magnetic force acting on the particle?
A positively charged particle is moving horizontally through a uniform magnetic field directed vertically upwards. What is the direction of the magnetic force acting on the particle?
Consider two parallel wires carrying electric currents. If the currents in both wires are flowing in the same direction, how will the wires interact?
Consider two parallel wires carrying electric currents. If the currents in both wires are flowing in the same direction, how will the wires interact?
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 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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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 exists.
- Friction affects the motion of two objects sliding past each other.
Types of Forces
- Force is a push or a pull on an object.
- Contact force is a push or a pull on one object by another that is touching it.
- Examples of contact forces include pushing a container, pressing on computer keys, and friction.
- Noncontact force is a push or a pull on one object by another without touching it.
- Examples of noncontact forces include gravity, magnetic, and electrical forces.
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 is friction between a surface and a fluid, such as water or air (air resistance).
Static Friction vs. Sliding Friction
- Static friction of -100N and an applied force of 100N results in a net force of 0N.
- Sliding friction of -70N and an applied force of 200N results in a net force of 130N.
Gravity, Mass, and Distance
- 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, measured in newtons, N.
- If an astronaut weighs 539N and has a mass of 55kg on Earth, the astronaut's weight would be less while 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 determines magnetic strength.
- The further away magnets are from each other, the weaker the magnetic force.
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Description
Explore how forces change motion, differentiating between contact and non-contact forces. Learn about universal gravitation and the various types of friction: static, sliding, and fluid. Understand how each affects the movement of objects.
