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Questions and Answers
What is represented by arrows in force diagrams?
What is represented by arrows in force diagrams?
- The color of the object
- The direction and magnitude of forces acting on the object (correct)
- The velocity of the object
- The mass of the object
A free body diagram shows the object as a block and labels the forces acting on it.
A free body diagram shows the object as a block and labels the forces acting on it.
False (B)
What is the definition of net force?
What is the definition of net force?
The single force that will have the same effect as all the original forces acting on an object.
When the effects of each force are cancelled out by another, the forces are called __________ forces.
When the effects of each force are cancelled out by another, the forces are called __________ forces.
Match the following types of forces to their descriptions:
Match the following types of forces to their descriptions:
Which diagram shows all the forces acting on a specific object and represents it as a dot?
Which diagram shows all the forces acting on a specific object and represents it as a dot?
Net force is zero when forces acting on an object are unbalanced.
Net force is zero when forces acting on an object are unbalanced.
What must be included with the arrows in a force diagram?
What must be included with the arrows in a force diagram?
What occurs when forces acting on an object are balanced?
What occurs when forces acting on an object are balanced?
Static equilibrium occurs when an object is in motion and not experiencing any net force.
Static equilibrium occurs when an object is in motion and not experiencing any net force.
Name a type of force that occurs when two surfaces slide across each other.
Name a type of force that occurs when two surfaces slide across each other.
In dynamic equilibrium, an object's speed and direction remain the same when the net force is ______.
In dynamic equilibrium, an object's speed and direction remain the same when the net force is ______.
Which of the following forces is NOT considered a contact force?
Which of the following forces is NOT considered a contact force?
Match the following types of equilibrium with their characteristics:
Match the following types of equilibrium with their characteristics:
An applied force is always greater than the frictional force in order for an object to move.
An applied force is always greater than the frictional force in order for an object to move.
What is a free body diagram used for?
What is a free body diagram used for?
What do magnetic field lines indicate?
What do magnetic field lines indicate?
Magnetic field lines can cross each other.
Magnetic field lines can cross each other.
What is the relationship between gravitational force and distance?
What is the relationship between gravitational force and distance?
The symbol for gravitational force is ______.
The symbol for gravitational force is ______.
Match the following terms with their definitions:
Match the following terms with their definitions:
What causes a magnet to attract a non-magnetized ferromagnetic material?
What causes a magnet to attract a non-magnetized ferromagnetic material?
What are the two poles of a magnet called?
What are the two poles of a magnet called?
The strength of a magnetic field is indicated by the closeness of the field lines.
The strength of a magnetic field is indicated by the closeness of the field lines.
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Study Notes
Forces and Motion
- Force is an interaction that can cause an object to accelerate.
- Air resistance is a type of force that acts on objects moving through the air.
- Electric Field is a region surrounding a charged object where other charged objects would experience a force.
- Force Diagrams represent the forces acting on an object, showing the object and all the forces acting on it.
- Free Body Diagrams show the object as a dot and all the forces acting on it, represented by arrows.
- Forces are represented as arrows, with length indicating the size of the force.
- The arrow direction shows the direction of the force.
- Force arrows start at the point the force is applied and point away from the dot.
- Forces should be clearly labelled.
Resultant or Net Force
- The net force is the single force that has the same effect as all original forces acting on an object.
- When net force is zero the object is in equilibrium, meaning its motion does not change.
- Balanced Forces cancel each other out, resulting in no change in the object's motion.
- Unbalanced Forces cause a change in the object's motion, leading to acceleration.
Equilibrium
- Static Equilibrium occurs when an object is at rest.
- Dynamic Equilibrium occurs when an object continues to move at aconstant velocity.
Magnetism
- Magnetic Field Lines show the strength and direction of a magnetic field.
- Magnetic Field Lines go from the North pole to the South pole of a magnet, and never cross.
- Strong magnetic fields are represented by closer field lines.
- Magnets have two poles: North and South.
- Magnetic Field Diagrams depict the shape and strength of a magnetic field around a magnet.
- Cobalt is a ferromagnetic material.
- Magnets attract non-magnetized ferromagnetic materials, because the magnet's field induces temporary alignment of magnetic domains, creating a temporary North and South pole in the other material.
Gravitational Force
- Gravitational Force is the attractive, non-contact force between any two objects with mass.
- Gravitational Force Increases with the mass of the objects.
- Gravitational Force Decreases as the distance between the objects increases.
- Mass is the amount of matter in an object, measured in kilograms (kg).
- Weight is the force exerted on an object by a large celestial body (like earth) on or near its surface, measured in Newtons (N).
- **Gravitational Acceleration ** is the acceleration due to gravity, approximately 9.8 m/s².
Contact Forces
- Contact Forces occur when objects are physically touching.
- Normal Force is the support force exerted by a surface perpendicular to the object resting on it.
- Frictional Force occurs when two surfaces slide or try to slide against each other.
- Applied Force is a force applied to an object by a person or another object.
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