Physics: Forces and Motion

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Questions and Answers

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?

  • Tension force
  • Normal force
  • Frictional force
  • Gravitational force (correct)

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?

<p>Force is directly proportional to acceleration (C)</p> Signup and view all the answers

According to Newton's Third Law, what is the relationship between action and reaction?

<p>The action is equal to the reaction (D)</p> Signup and view all the answers

What is the SI unit of force?

<p>Newton (N) (A)</p> Signup and view all the answers

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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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