Changes In Motion
Published on Nov 26, 2015
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PRESENTATION OUTLINE
FORCE
- An action exerted on an object's state of rest or motion
Definition of force. Understanding what force is helps grasp the concept of Newton's Laws of Motion.
Photo by Curtis Gregory Perry
FORCE CAN CAUSE ACCELERATIONS
- Start moving
- Stop moving
- Change directions
There are three ways that force can cause accelerations.
1. A force can start an object to move.
Examples: Throwing a ball, Kicking an object
2. A force can stop and object from moving.
Examples: Catching a ball, A person running into a wall
3. A force can change directions of an object.
Examples: If a ball is coming towards you and you swing the bat, it causes the ball to go in another direction.
1. A force can start an object to move.
Examples: Throwing a ball, Kicking an object
2. A force can stop and object from moving.
Examples: Catching a ball, A person running into a wall
3. A force can change directions of an object.
Examples: If a ball is coming towards you and you swing the bat, it causes the ball to go in another direction.
Photo by Ed Yourdon
FORCE'S UNIT
NEWTON (N)
Force has its own unit.
Newton (N)
A Newton is equivalent to kg m/ s^2
When you see a # with N as unit you should think FORCE.
Newton (N)
A Newton is equivalent to kg m/ s^2
When you see a # with N as unit you should think FORCE.
Photo by FlickrDelusions
FORCES CAN ACT THROUGH:
- Contact forces
- Distance (Field forces)
Two types of forces:
1. Contact
2. Field
1. Contact
2. Field
Photo by Mickyboyc
Untitled Slide
Photo by Phillie Casablanca
How to draw a free-body diagram
- Draw object
- Find center
- Draw forces (from center)
- Label forces
Remember that forces come from the middle of an object. Like a body's center core.
Photo by Cuito Cuanavale
Free body diagrams help analyze all of the forces involved, isolate one object
After isolating one object...
Label forces
Example: identify forces
Visual is on the next slide.
1. Draw object : sled
2. Identify center: made a dot in the middle of the sled
3. Draw forces: The problems states that there is:
60 N by string
130 N by Earth
90 N by ground
So there are three forces acting on the sled. There should be three arrows. One from string at an angle to the right, one by the earth which is straight down, and one by the ground which is straight up.
4. Label forces
The arrow that is at an angle is Fstring 60 N
The arrow that is straight down is Fgravity 130 N
The arrow that is straight up is Fground or Fnormal 90 N
You are done!
1. Draw object : sled
2. Identify center: made a dot in the middle of the sled
3. Draw forces: The problems states that there is:
60 N by string
130 N by Earth
90 N by ground
So there are three forces acting on the sled. There should be three arrows. One from string at an angle to the right, one by the earth which is straight down, and one by the ground which is straight up.
4. Label forces
The arrow that is at an angle is Fstring 60 N
The arrow that is straight down is Fgravity 130 N
The arrow that is straight up is Fground or Fnormal 90 N
You are done!
Visual
Assignment
Problem 1 a & b, 2
You assignment to complete is Problem 1 part a and b and Problem 2.
