Unit 4 Midterm Review

Bradley Sposit

Key Concepts of Unit 4

  1. Force body diagrams- You need to know how to explain and draw them.
  2. Describe the relationship between net force, mass, and acceleration.
  3. Calculate the net force, mass, or acceleration of an object.
  4. Explain the difference between mass and weight given a changing gravitational field.
  5. Evaluate and develop a mathematical model for elastic (spring) forces.
  6. Predict the force required to slide an object relating to the coefficient of friction.
  7. NEWTONS SECOND LAW!!!!!

Formulas


  • Fnet = m*a
  • a = Δv / Δt
  • Δx= ½ at^2 (if v0 = 0)
  • Fc = mv^2 / r
  • ac = v^2 / r
  • Felastic = k Δx
  • v1^2 = v0^2 + 2a (Δx)
  • Fk = μk*FN

Vocabulary

Circular- A circle shape


Centripetal- Think of the "bucket and rope" trick


Centrifugal- is the effect that tends to move an object away from the center of a circle it is rotating about


Free-body diagram- The arrow diagram that shows forces on a object


Friction- The force resisting the relative motion of solid surfaces


Kinetic- Resistance to objects in motion


Static- Stationary friction


Linear- A direct relationship (straight line)


Normal force- The force that is perpendicular to the surface


Net force- The overall force acting on an object


Tangent- Opposite divided by adjacent


Torque- A measure of force acting on an object that causes it to rotate


Weight- Mass*Gravity


Apparent Weight- force exerted on a scale


Weightlessness- Apparent weight is zero

Practice Questions