Forces Notes

1
Forces Notes

• Your directions will be in red on each slide.
• Write todays title and objective in your
  journal
• Title FORCES NOTES
• Objective Identify and describe the changes in
  position, direction, and speed of an object when
  acted upon by unbalanced forces.

2
Think

• Draw the diagram below in your journal. Write the
  following questions in your journal and answer
  them.
• What would happen if both people pushed in the
  same direction? Why?
• What happens when the people are pulling in the
  opposite direction? Why?

3
Review What Is Mass?

• Write these notes and draw a picture of a triple
  beam balance in your journal.
• Mass is the amount of matter in an object.
• We measure mass with a triple beam balance.
• The unit of measurement for mass is the gram (g).

4
What Is Force?

• Draw the diagram and write the definition in your
  journal. Dont forget the arrows and labels in
  your diagram.
• Force is a push or pull that one object exerts on
  another. A force has both size and direction.

Fkick
Fgravity
5
What are some common forces?

• Copy these notes into your journal
• Some common examples of force are
• Gravitational Force (Gravity)
• Weight
• Friction
• Applied force
• Balanced Force
• Unbalanced Force

6
How do we measure Force?

• Copy these notes into your journal and draw an
  example picture of a spring scale
• Force is the mass of an object multiplied by the
  objects acceleration. We can calculate force
  using the formula Fma
• We use a Spring Scale to measure force.
• The unit of measurement for force is the Newton
  (N)

7
What is Weight Force?

• Copy these notes into your journal and draw an
  example picture of a scale
• Weight Force is the mass of an object multiplied
  by the acceleration due to gravity. We calculate
  it the same way as any other force, but with a
  special acceleration number that is always the
  same.
• The acceleration due to gravity is always 9.8m/s2
  and we represent this very special acceleration
  with the letter g.
• We can calculate weight force using the formula
  Fwmg.
• We use a Scale to measure weight force.
• The unit of measurement for force is the Newton
  (N)

8

• Lets Review! Answer the following questions in
  your journal
• What is mass?
• What tool do we use to measure mass?
• What is the unit of measurement for mass?
• What is weight?
• What tool do we use to measure weight?
• What is the unit of measurement for weight?

9
What are some common forces?

• Write the definitions in your journal
• Gravitational Force (Gravity) The force of
  attraction between objects that is due to their
  masses. You feel the force of gravity pulling you
  to Earth when you jump up and down.
• Weight - a measure of gravitational force on an
  object.
• We measure weight (force) with a Spring Scale.
• Unit Newton

10
What are some common forces?

• Write the definition and examples in your journal
  
• Friction a force that opposes motion at a
  contact point between two surfaces.
• Air resistance is a type of friction
• Friction makes objects slow down or stop moving

11
What are some common forces?

• Write the definition in your journal
• Applied force a push or pull on an object by a
  person or another object.

12
Net Force

• Write the definition and draw an example diagram
  in your journal
• Net force is the combined effect of all forces
  acting on an object.

13
Balanced Forces

• Write the definition and notes in your journal
• Balanced forces are forces acting on an object
  that are opposite in direction and equal in size
• There is no change in position, direction of
  motion, or speed of an object when all of the
  forces are balanced
• Balanced forces make an object sit still or keep
  moving at a constant speed

14
Unbalanced forces

• Write the definition and notes in your journal
• Unbalanced Forces are opposing forces that are
  not equal
• Unbalanced forces cause change in position,
  direction of motion and speed of an object
• Unbalanced forces make objects speed up, slow
  down, or change direction

15

• Answer the questions in your journal
• 1. What are the different forces acting on the
  figure skaters?
• 2. In what directions are the forces acting?
• 3. Are the forces balanced or unbalanced? How do
  you know?

16
Balanced and Unbalanced Forces Module

• Test your knowledge! Click on the link below and
  follow the directions on screen.
• http//www.engineeringinteract.org/resources/parkw
  orldplot/flash/concepts/balancedandun.htm