3.3 Forces and Newton's Laws

• There are two main types of forces: contact and non-contact forces


  True
• Non-contact forces act through fields without direct physical contact


  True
• Contact forces involve direct interaction, while non-contact forces act through fields


  True
• What does Newton's Second Law of Motion state?

  F = ma
• Mass is the measure of an object's resistance to acceleration

  True
• The net force is the total force acting on an object after combining all individual forces
• What is another name for Newton's First Law of Motion?

  Law of Inertia
• The higher an object's mass, the greater its inertia.


  True
• For every action, there is an equal and opposite reaction
• A friction force of 5 N reduces the net force on a box being pulled with 20 N.


  True
• Contact forces require direct physical contact
• Understanding the different types of forces is crucial in analyzing the motion and interactions of objects
• Steps of Newton's First Law of Motion

  1️⃣ Object at rest remains at rest

  2️⃣ Object in motion stays in motion

  3️⃣ Net force is required to change motion
• Inertia is the tendency of an object to resist changes in its state of motion
• What is the net force required to accelerate a 1000 kg car at 2 m/s²?

  2000 N
• What is the unit of mass?

  kg
• Contact forces require direct physical contact
• Non-contact forces act through fields and do not require physical contact.


  True
• An object in motion stays in motion with the same speed and direction unless acted upon by a net force
• Newton's Second Law states that the net force acting on an object equals its mass multiplied by its acceleration
• Net force is measured in Newtons (N).


  True
• What type of quantity is force?

  Vector
• What are examples of contact forces?

  Friction, tension, normal reaction
• What are examples of non-contact forces?

  Gravitational, electrostatic, magnetic
• What is another name for Newton's First Law of Motion?

  Law of Inertia
• An object moving with constant velocity has a net force of zero acting on it

  True
• In Newton's Second Law, net force is measured in Newtons
• Force is a vector quantity with both magnitude and direction


  True
• What is the definition of acceleration?

  Rate of change of velocity
• What is an example of a non-contact force?

  Gravitational force
• What is inertia a measure of?

  Resistance to change in motion
• What is the formula for Newton's Second Law of Motion?

  $F =$$ma$
• What is the unit of acceleration?

  m/s²
• What is the formula for Newton's Third Law of Motion?

  F_{\text{action}} = - F_{\text{reaction}}</latex>