Forces 3

• What does Newton's first law state about an object with zero resultant force?

  The object remains in its state of motion.
• What happens to a stationary object when the resultant force is zero?

  It will remain stationary.
• What happens to a moving object when the resultant force is zero?

  It continues to move at the same velocity.
• What is the term for an object with zero resultant force?

  The object is in equilibrium.
• What is the tendency of objects to continue in their state of rest or uniform motion called?

  Inertia.
• How do you calculate the resultant force when two forces act in the same direction?

  Add the magnitudes of the forces together.
• What is the resultant force when 5N and 7N act in the same direction?

  12N to the right.
• What happens to an object when the resultant force is 2N to the left?

  The object will accelerate to the left.
• What is the resultant force when two equal forces of 6N act in opposite directions?

  0N, the object remains stationary.
• What is a force?

  A push, pull, or twist on an object.
• What is the resultant force?

  A single force replacing multiple forces.
• In which direction will an object accelerate when a resultant force acts upon it?

  In the direction of the resultant force.
• What happens when two objects interact in terms of forces?

  The forces are equal and opposite.
• How does the gravitational force between the Earth and the Moon work?

  Earth pulls on Moon, Moon pulls on Earth equally.
• How do you find the resultant force using scale drawings?

  • Draw forces tip-to-tail to scale.
  • Draw a straight line from start to end.
  • Measure the length for magnitude.
  • Measure the angle for direction.
• What does it mean if forces are balanced on an object?

  The resultant force is zero, and the object is in equilibrium.
• What does a complete loop in a scale diagram indicate?

  The object is in equilibrium.
• What are components of forces?

  Forces split into horizontal and vertical parts.
• How can you resolve a force acting at an angle?

  Split it into horizontal and vertical components.
• What happens when you apply forces to an object?

  It may stretch, compress, or bend.
• What is elastic deformation?

  Object returns to original shape after forces removed.
• What is inelastic deformation?

  Object does not return to original shape after forces removed.
• What is Hooke's Law?

  Extension is proportional to the force applied.
• What is the equation representing Hooke's Law?

  $F =$$k \cdot e$
• What does the spring constant measure?

  Stiffness of the spring material.
• How do you calculate the force needed to extend a spring?

  Multiply spring constant by extension.
• What is the force needed to extend a spring with a spring constant of 65 N/m by 0.20 m?

  13 N.
• What is the limit of proportionality?

  The maximum force for proportional extension.
• What happens after the limit of proportionality is exceeded?

  Extension increases disproportionately with force.