Forces

• What is a force?


  A push or pull that acts on an object due to its interaction with another object.
• What are vector quantities?

  Vector quantities are physical quantities that have both magnitude and direction
• Give some examples of vector quantities?

  Velocity, displacement, acceleration, momentum
• What are scalar quantities?

  Scalar quantities are physical quantities that have magnitude but no direction.
• What are examples of scalar quantities?

  mass, temperature, and time and speed distance and energy
• What are contact forces?

  When two objects have to be touching for a force to act
• What are examples of Contact forces?


  Friction, Air resistance , tension , normal contact force
• What are non-contact forces?

  Forces that act on an object without physical contact.
• What are examples of non-contact forces?

  Gravitational, magnetic force, and electrostatic force.
• What are vector quantities shown by?

  Arrows
• Are forces vector or scalar quantities? Why?

  Forces are vector quantities because the use both magnitude and direction.
• What does the length arrow show?

  The size of the force
• what is altitude?


  The height above the ground
• What is the resultant force?

  The overall energy
• If all the forces acting on an object balance out, then we say that the object is in equilibrium
• What is Newtons first law of motion?

  A resultant force is required to change the motion of an object
• What happens if the resultant force is zero and the object is stationary?

  the object is stationary, the object remains stationary
• What happens if the resultant force is zero and the object is moving ?

  the object is moving, the object continues to move at the same speed and in the same direction. So the object continues to move at the same velocity.
• What is inertia?


  The tendency of objects to continue in their state of rest or of uniform motion
• What is Newtons Second Law?

  The acceleration of an object is proportional to the resultant force acting on the object, and inversely proportional to the mass of the object.
• What is the equation for newtons second law?

  resultant f orce = mass × acceleration
• What is force measured in?

  Newtons
• What is mass measured in ?

  Kg
• What is acceleration measured in?

  m/s^2
• What is Inertial mass?

  inertial mass is a measure of how difficult it is to change the velocity of an object
• Do moving objects have momentum?


  Yes.
• Do objects that are not moving have momentum?


  No.
• What is the general idea about momentum?


  All moving objects have momentum. If a object is not moving then the momentum is zero.
• What is the equation for momentum?

  Momentum=mass x Velocity
• What is momentum measured in?


  Kg m/s
• What is mass measured in (momentum)


  Kg
• What is velocity measured in (momentum)


  m/s
• What is the conservation of momentum?


  When In a closed system, the total momentum before an event is equal to the total momentum after an event.
• What type of quantity is Momentum


  Vector
• The faster and heavier an object is, the more momentum it has.
• What is the stopping distance?


  The total distance travelled from when the driver first stops the obstruction to when the car stops.
• What is the typical range of reaction time?


  0.2-0.9
• What is the Thinking distance?


  The distance travelled by the car during the drivers reaction time.
• What is the breaking distance?


  The distance the car travels from when the driver applies the breaks to when the car stops.
• What makes up the stopping distance?


  The breaking and thinking distance