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Questions and Answers
What does a one newton of force signify?
What does a one newton of force signify?
- The force that can give a 1 kg body an acceleration of 1 m/s².
- The force that can give a 1 kg body an acceleration of -9.8 m/s². (correct)
- The force that can give any mass an acceleration of 1 m/s².
- The force that can give any mass an acceleration of -9.8 m/s².
Which situation demonstrates balanced forces acting on an object?
Which situation demonstrates balanced forces acting on an object?
- A coin moves in decreasing velocity as it is tossed in the air.
- A ball is freely falling from a building.
- A boulder is speeding up while rolling down an incline.
- A box rests above a platform. (correct)
Which of the following statements is TRUE about unbalanced forces?
Which of the following statements is TRUE about unbalanced forces?
- It changes the state of motion of objects. (correct)
- It makes an object move at constant velocity.
- It keeps an object at rest.
- It results in uniform motion.
What classification of force does not require physical contact between objects?
What classification of force does not require physical contact between objects?
What force is present when an object exerting a force touches another object?
What force is present when an object exerting a force touches another object?
What does net force refer to?
What does net force refer to?
If two persons are pushing a box horizontally, what can be inferred about its motion?
If two persons are pushing a box horizontally, what can be inferred about its motion?
In a free body diagram (FBD), which statement is TRUE about the forces acting on a box?
In a free body diagram (FBD), which statement is TRUE about the forces acting on a box?
Which of the following statements best describes unbalanced forces?
Which of the following statements best describes unbalanced forces?
What does the term 'net force' specifically refer to?
What does the term 'net force' specifically refer to?
What unit is used for measuring force in the International System of Units (SI)?
What unit is used for measuring force in the International System of Units (SI)?
In which situation would an object likely have greater inertia?
In which situation would an object likely have greater inertia?
Which of the following is true about balanced forces?
Which of the following is true about balanced forces?
Which law states that an object at rest will remain at rest unless acted on by an unbalanced force?
Which law states that an object at rest will remain at rest unless acted on by an unbalanced force?
If the net force on an object is zero, which of the following can be concluded?
If the net force on an object is zero, which of the following can be concluded?
When forces are described as non-contact forces, what does this imply?
When forces are described as non-contact forces, what does this imply?
What happens to the acceleration of an object if the net force acting on it increases, according to Newton's Second Law of Motion?
What happens to the acceleration of an object if the net force acting on it increases, according to Newton's Second Law of Motion?
Which of the following BEST describes the role of friction?
Which of the following BEST describes the role of friction?
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Study Notes
What is Force?
- A force is a push or a pull that results from an interaction between objects.
- It is a vector quantity, meaning it has both magnitude and direction.
- The standard unit of force is the Newton (N).
Types of Forces
- Contact forces: Forces that require physical contact between objects, such as pushing a box or friction.
- Non-contact forces: Forces that act without direct contact, such as gravity, magnetism, and electric forces.
Newton's Laws of Motion
- Newton's First Law (Law of Inertia): An object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity unless acted upon by an unbalanced force.
- Inertia is the tendency of an object to resist changes in its motion.
- The more massive an object is, the greater its inertia.
- Newton's Second Law (Law of Acceleration): The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
- In equation form: F = ma (where F is force, m is mass, and a is acceleration)
- Newton's Third Law (Law of Action-Reaction): For every action, there is an equal and opposite reaction.
- When one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
Net Force
- The sum of all forces acting on an object, taking into account both magnitude and direction.
- When net force is zero, the object is in equilibrium and its state of motion remains unchanged.
- When net force is not zero, the object accelerates in the direction of the net force.
Balanced and Unbalanced Forces
- Balanced forces: Forces acting on an object that cancel each other out, resulting in a net force of zero.
- Unbalanced forces: Forces acting on an object that do not cancel each other out, resulting in a net force that is not zero.
Friction
- A force that opposes motion between surfaces in contact.
- Friction can be static (opposing the start of motion) or kinetic (opposing motion that is already occurring).
Other Important Concepts
- Acceleration: The rate of change of velocity over time.
- Velocity: The rate of change of position over time.
- Equilibrium: A state where the net force acting on an object is zero, and the object is either at rest or moving at a constant velocity.
Example Calculations
- Force needed to accelerate a 1 kg object at 1 m/s²: Using F=ma, F = (1 kg)(1 m/s²) = 1 N
- Net force on a stationary box with multiple forces acting on it: Sum all the forces, accounting for their directions. If the sum is zero, the net force is zero and the box remains at rest.
- Acceleration of an object when a specific force is applied: Using F=ma, rearrange to solve for a: a = F/m
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