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Questions and Answers
A box rests on a table. Which of the following statements best describes the forces acting on the box, assuming the table and box are stationary?
A box rests on a table. Which of the following statements best describes the forces acting on the box, assuming the table and box are stationary?
- The normal force from the table is greater than the gravitational force, resulting in an upward net force.
- The gravitational force acting on the box is balanced by the normal force from the table, resulting in zero net force. (correct)
- The gravitational force acting on the box is the only force present.
- The gravitational force acting on the box is slightly less than the normal force, allowing the box to remain at rest.
Two objects with masses $m_1$ and $m_2$ are separated by a distance $r$. If the mass of each object is doubled and the distance between them is also doubled, how does the gravitational force between them change according to the law of universal gravitation?
Two objects with masses $m_1$ and $m_2$ are separated by a distance $r$. If the mass of each object is doubled and the distance between them is also doubled, how does the gravitational force between them change according to the law of universal gravitation?
- It remains the same. (correct)
- It increases by a factor of 2.
- It decreases by a factor of 2.
- It increases by a factor of 4.
A car accelerates from rest to $25 m/s$ in $5$ seconds. If the force propelling the car remains constant, what would happen to the car's acceleration if the mass of the car were doubled?
A car accelerates from rest to $25 m/s$ in $5$ seconds. If the force propelling the car remains constant, what would happen to the car's acceleration if the mass of the car were doubled?
- The acceleration would double.
- The acceleration would be reduced to one-quarter of its original value.
- The acceleration would be reduced to one-half of its original value. (correct)
- The acceleration would remain the same.
A hockey puck slides across an ice rink. Which of the following forces is primarily responsible for slowing down the puck?
A hockey puck slides across an ice rink. Which of the following forces is primarily responsible for slowing down the puck?
Which of the following scenarios best illustrates Newton's Third Law of Motion?
Which of the following scenarios best illustrates Newton's Third Law of Motion?
Flashcards
Newton's 1st Law
Newton's 1st Law
An object at rest stays at rest, and an object in motion stays in motion unless acted on by an outside force.
Force (F)
Force (F)
A push or pull that can cause an object to accelerate.
Types of Friction
Types of Friction
Static, sliding, rolling, and fluid friction oppose motion of objects.
Mass vs. Weight
Mass vs. Weight
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Fundamental Forces
Fundamental Forces
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Study Notes
Newton's Laws of Motion
- First Law: An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
- Second Law: Force equals mass times acceleration (F=ma).
- Third Law: For every action, there is an equal and opposite reaction.
Calculating Forces
- Net force: The overall force acting on an object.
- Balanced forces: Forces that are equal in size and opposite in direction, resulting in a net force of zero.
- Unbalanced forces: Forces that are not equal in size and opposite in direction, resulting in a net force that causes acceleration.
Types of Forces
- Contact forces: Forces that require physical contact between objects (e.g., friction, tension, normal force).
- Field forces: Forces that act over a distance without physical contact (e.g., gravitational force, magnetic force, electric force).
Fundamental Forces
- Gravitational force: The force of attraction between any two objects with mass.
- Electromagnetic force: The force between electrically charged particles.
- Strong nuclear force: The force that holds the nucleus of an atom together.
- Weak nuclear force: The force involved in some types of radioactive decay.
Friction
- Static friction: Friction between two surfaces that are not moving relative to each other.
- Sliding friction: Friction between two surfaces that are sliding relative to each other.
- Rolling friction: Friction between a rolling object and a surface.
- Fluid friction: Friction between an object moving through a fluid (liquid or gas).
Kinematics and Dynamics
- Kinematics: The study of motion without considering the forces that cause it.
- Dynamics: The study of motion and the forces that cause it.
Mass and Weight
- Mass: The amount of matter in an object.
- Weight: The force of gravity acting on an object's mass.
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Description
Explore Newton's Laws of Motion: the first law (inertia), the second law (F=ma), and the third law (action-reaction). Learn about net force, balanced and unbalanced forces, contact forces, field forces and gravitational force.
