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Questions and Answers
A car is traveling at a constant velocity of 25 m/s. According to Newton's First Law, what external influence is required to change the car's velocity?
A car is traveling at a constant velocity of 25 m/s. According to Newton's First Law, what external influence is required to change the car's velocity?
- The car's inertia maintaining its motion.
- An unbalanced force acting upon the car. (correct)
- The car's weight acting downwards.
- A continuous supply of fuel to the engine.
Two objects have different masses. Object A has a mass of 5kg, and object B has a mass of 15kg. How does the inertia of object B compare to the inertia of object A?
Two objects have different masses. Object A has a mass of 5kg, and object B has a mass of 15kg. How does the inertia of object B compare to the inertia of object A?
- Object B has the same inertia as object A because inertia is constant.
- Object B has three times the inertia of object A. (correct)
- Object B has one-third the inertia of object A.
- Object B has nine times the inertia of object A.
A net force of 20 N is applied to an object with a mass of 5 kg. What is the acceleration of the object?
A net force of 20 N is applied to an object with a mass of 5 kg. What is the acceleration of the object?
- 4 m/s² (correct)
- 25 m/s²
- 100 m/s²
- 0.25 m/s²
A book is resting on a table. Which of the following statements correctly describes the forces acting in this situation based on Newton's Third Law?
A book is resting on a table. Which of the following statements correctly describes the forces acting in this situation based on Newton's Third Law?
An astronaut pushes off the side of their spacecraft during a spacewalk. According to Newton's Third Law, what happens?
An astronaut pushes off the side of their spacecraft during a spacewalk. According to Newton's Third Law, what happens?
A skydiver jumps from an airplane. Initially, they accelerate downwards, but eventually reach a constant velocity. What is the name of the constant velocity reached?
A skydiver jumps from an airplane. Initially, they accelerate downwards, but eventually reach a constant velocity. What is the name of the constant velocity reached?
A 10 kg box is being pulled across a frictionless floor with a force of 30 N. What is the acceleration of the box?
A 10 kg box is being pulled across a frictionless floor with a force of 30 N. What is the acceleration of the box?
Two people are pulling on a rope in opposite directions. Person A is pulling with a force of 50 N to the left, and Person B is pulling with a force of 75 N to the right. What is the net force on the rope?
Two people are pulling on a rope in opposite directions. Person A is pulling with a force of 50 N to the left, and Person B is pulling with a force of 75 N to the right. What is the net force on the rope?
If the net force acting on an object is zero, which of the following statements must be true?
If the net force acting on an object is zero, which of the following statements must be true?
A ball is thrown upwards. Considering only the force of gravity, what is the ball's weight (Fg) as it rises?
A ball is thrown upwards. Considering only the force of gravity, what is the ball's weight (Fg) as it rises?
Flashcards
Newton's First Law
Newton's First Law
An object at rest stays at rest, and an object in motion stays in motion with constant velocity unless acted upon by an unbalanced force.
Inertia
Inertia
The tendency of an object to resist changes in its state of motion.
Mass
Mass
A measure of the amount of inertia a body has.
Newton's Second Law
Newton's Second Law
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Net Force
Net Force
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Weight (Fg)
Weight (Fg)
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Terminal Velocity
Terminal Velocity
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Newton's Third Law
Newton's Third Law
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Action-reaction pairs
Action-reaction pairs
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Study Notes
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Newton's First Law: Objects maintain their state of rest or constant velocity unless acted upon by an unbalanced force.
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Inertia: An object's tendency to resist changes in its state of motion; a scalar quantity.
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Mass: Measures the amount of inertia an object possesses; a scalar quantity.
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Greater mass corresponds to greater inertia.
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Newton's Second Law: An object's acceleration is directly proportional to the net force, in the same direction as the net force, and inversely proportional to its mass.
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Net Force: The sum of all forces acting on an object, causing acceleration.
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Weight (Fg): The gravitational force exerted on an object with mass.
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Terminal Velocity: The constant speed and direction achieved by a free-falling object when air resistance prevents further acceleration.
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Newton's Third Law: For every force exerted by one object on another, the second object exerts an equal and opposite force on the first.
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Forces exist in pairs. Action-reaction pairs always act on different objects.
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Description
Study the fundamental principles governing motion: Newton's First, Second, and Third Laws. Explore concepts like inertia, mass, net force, and weight. Understand how these laws explain the behavior of objects in motion and at rest.
