Ch_4_tonuzire

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= Homework =

Lesson 1 a, b, c, & d
Method 4

Q: **What is Newton’s first law?** Inertia - An object will continue in its current state (e.g. rest or constant motion) unless acted upon by an unbalanced force "Objects keep on doing what they're doing"

**What did Galileo discover / state about the concept of inertia?**

Motion of moving objects stop due to the force of friction between surfaces

**What continues an object's motion?** Objects in motion will stop do to an opposing force, it will continue even if there is no current force acting on it.

**What is the relationship between mass and inertia of an object?** Mass is dependent on an object’s inertia Inertia can vary depending on mass Objects that have a greater mass have a greater inertia

**What is an object's state of motion?** An object’s state of motion is its velocity, which is measured in magnitude and direction. Rest, which is when an object doesn’t change its state of motion

**What are Balanced and unbalanced forces?** Balanced forces are forces that are in opposite directions but have the same magnitude, which allows an object stay in its state of motion Unbalanced forces are forces that have no equivalent and can cause changes in the state of motion of an object

Lesson 2 a, b, c, & d
Method 4

Q:

**What does force mean?** Force is a push or pull on an object as a result of contact with another object Contact forces are forces of physical contact Action-at-a-distance forces are forces that can exert push or pull regardless of physical distance

**What are some different types of forces?** A __force__ that is applied by an object is applied force __Gravity__, or weight, is the pull on an object by a big object, for example the earth. __Normal__ force is a force that pushes against another object, supporting it. __ Friction __ is a force applied when a moving object moves across the surface of another object. __Tension__ is a force applied by a rope, string, chain, etc.

**What is the difference between mass and weight?** Mass is the amount of matter that is in an object Weight is the gravitational force exerted on an object (e.g. earth’s gravity on moon)

**What is good to remember when drawing a Free Body Diagram?** Separate the system from its surroundings Draw arrows in the direction that a force is pointing

**What is a net force, and how is it determined?** Net force ∑F is a sum of all the forces acting on an object

Lesson 3 a & b
Method 4

Q: **What are the main ideas of Newton's second law of motion?**

Illustrates an objects motion when all forces are unbalanced Acceleration is directly related to net force Acceleration and object mass inversely related Net force is the vector sum of all the forces that are acting on an object Basically a = Fnet/m

**What is a common misconception relating to Newton's second law?**

A force is constantly required to keep an object moving To change the speed of object acceleration is need, which is an unbalanced force acting on an object. If an object is moving at constants speed, there are no unbalanced forces acting on it.