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Questions and Answers
What is the direction of a normal force?
What is the direction of a normal force?
- Opposite to the direction of motion
- Parallel to the surface
- At an angle to the surface
- Perpendicular to the surface (correct)
Which of the following is an example of a non-contact force?
Which of the following is an example of a non-contact force?
- Tension force
- Normal force
- Frictional force
- Gravitational force (correct)
What is the net force acting on an object?
What is the net force acting on an object?
- The sum of all individual forces
- The difference between the largest and smallest forces
- The force with the largest magnitude
- The resultant force acting on an object, calculated by vector addition of individual forces (correct)
What is the relationship between force and acceleration?
What is the relationship between force and acceleration?
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According to Newton's Third Law, what is the relationship between action and reaction?
According to Newton's Third Law, what is the relationship between action and reaction?
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What is the SI unit of force?
What is the SI unit of force?
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Study Notes
Definition of Force
- A force is a push or pull that causes an object to change its motion or shape.
- It is a vector quantity, having both magnitude (amount of force) and direction.
Types of Forces
- Contact Forces:
- Frictional force (resists motion between two surfaces in contact)
- Tension force (in a stretched string or wire)
- Normal force (perpendicular to a surface, exerted by a surface on an object)
- Non-Contact Forces:
- Gravitational force (attracts two objects with mass)
- Electromagnetic force (acts between charged particles)
- Nuclear force (holds protons and neutrons together in an atomic nucleus)
Characteristics of Forces
- Net Force: The resultant force acting on an object, calculated by vector addition of individual forces.
- Force and Acceleration: Force is directly proportional to acceleration (F = ma).
- Force and Mass: Force is directly proportional to mass (F = ma, with acceleration constant).
- Action and Reaction: For every action, there is an equal and opposite reaction (Newton's Third Law).
Force Units
- SI Unit: Newton (N)
- Other Units: pound-force (lbf), kilogram-force (kgf), dyne
Definition and Characteristics of Force
- A force is a push or pull that causes an object to change its motion or shape.
- Force is a vector quantity, having both magnitude (amount of force) and direction.
Types of Forces
- Contact Forces: • Frictional force: resists motion between two surfaces in contact. • Tension force: acts in a stretched string or wire. • Normal force: perpendicular to a surface, exerted by a surface on an object.
- Non-Contact Forces: • Gravitational force: attracts two objects with mass. • Electromagnetic force: acts between charged particles. • Nuclear force: holds protons and neutrons together in an atomic nucleus.
Characteristics of Forces
- Net Force: the resultant force acting on an object, calculated by vector addition of individual forces.
- Force and Acceleration: force is directly proportional to acceleration (F = ma).
- Force and Mass: force is directly proportional to mass (F = ma, with acceleration constant).
- Action and Reaction: for every action, there is an equal and opposite reaction (Newton's Third Law).
Force Units
- SI Unit: Newton (N)
- Other Units: pound-force (lbf), kilogram-force (kgf), dyne
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