9.1 Forces and Motion

• Non-contact forces act without direct physical contact.


  True
• The acceleration of an object is directly proportional to its mass.

  False
• Arrange the following terms in order from their fundamental concepts to their definitions:

  1️⃣ Position

  2️⃣ Velocity

  3️⃣ Acceleration
• Velocity includes both speed and direction
• Match the type of force with its example:

  Contact Force ↔️ Friction

  Non-Contact Force ↔️ Gravity
• What is the unit for acceleration?

  m/s²
• Friction is a contact force that opposes motion
• What does the conservation of momentum state for a closed system?

  Total momentum remains constant
• Match the concept with its definition and units:

  Momentum ↔️ Product of mass and velocity, kg·m/s

  Velocity ↔️ Rate of change of position, m/s
• Force is a scalar quantity.

  False
• Non-contact forces act through fields.
• What is the formula for Newton's Second Law?

  $F =$$ma$
• What is the formula for velocity?

  $v =$$\frac{\Delta x}{\Delta t}$
• What is the unit of net force?

  Newtons (N)
• How do you calculate the net force acting on an object?

  Add individual forces
• What is the unit of net force?

  Newtons
• Newton's Second Law states that net force causes acceleration.


  True
• Gravitational force is the force of attraction between two objects with mass
• What is the approximate value of acceleration due to gravity on Earth?

  9.81 \, \text{m/s}^2</latex>
• Static friction opposes the initial motion between stationary surfaces.


  True
• What is momentum defined as?

  Product of mass and velocity
• In a displacement-time graph, the slope represents the velocity of the object.
• The area under an acceleration-time graph represents the change in velocity
• Friction is an example of a contact force.
• A car at rest will remain at rest unless acted upon by an unbalanced force.
• What does the slope of a displacement-time graph represent?

  Velocity
• The area under a velocity-time graph represents the object's displacement.

  True
• Contact forces require direct physical contact
• Newton's first law is also known as the law of inertia
• An object in motion will stop immediately unless acted upon by an unbalanced force.

  False
• What is the unit for acceleration?

  m/s²
• What are the two main types of forces?

  Contact and non-contact
• Acceleration is inversely proportional to mass.


  True
• What is the acceleration due to gravity in freefall without air resistance?

  9.81 m/s²
• Momentum is the product of mass and velocity.


  True
• The formula for momentum is $p =$$mv$.


  True
• The conservation of momentum explains the recoil of a gun
• Give an example of a contact force.

  Friction
• Newton's First Law is also known as the Law of Inertia.


  True
• Match the concept with its definition, units, and formula:

  Velocity ↔️ Rate of change of position, m/s, $v =$$\frac{\Delta x}{\Delta t}$

  Acceleration ↔️ Rate of change of velocity, m/s², $a =$$\frac{\Delta v}{\Delta t}$