1. Motion and Design
Quarter

2. What will we learn?
The students will be able to describe how different forces (friction, gravity, and change in mass) change the motion of the object.
5.P.1. Understand force, motion and the relationship between them.
5.P.1.1 Explain how factors such as gravity, friction, and change in mass affect the motion of objects.

3. PUSH OR PULL = FORCE
Yolanda Guerrero/VIPS

4. Two Types of Forces
Balanced forces = they balance each other out, so there is no change in motion
Unbalanced forces = one force is stronger than the other, so motion occurs

5. Balanced Forces BALANCED FORCES SAME! And motion does not change
UNBALANCED FORCES
One force is stronger than the other
Change in motion
Yolanda Guerrero/VIPS

6. UNBALANCED FORCES
Yolanda Guerrero/VIPS

7. Net Force
When more than 1 force acts on an object, the forces combine to form a net force.
*opposite direction: subtract the Newtons
*same direction: add the Newtons

8. Balanced or Unbalanced
Sometimes forces are shown with vectors (arrows). A longer arrow means a greater force.
Pictured below:
Balanced or unbalanced?
Which direction would the object move?

9. What is gravity? FORCE OF GRAVITY=GROUND FORCE
Gravity is a forces that PULLS us towards the earth.
Yolanda Guerrero/VIPS

10. FALLING OBJECTS STOP MOVING WHEN AIR BALANCED FORCES
Yolanda Guerrero/VIPS

11. Gravity continues pulling
Ground also pushes
Yolanda Guerrero/VIPS

12. Why do things eventually slow down or stop moving.
Yolanda Guerrero/VIPS

13. FRICTION OPPOSES MOTION
Objects stops when all forces are balanced
GOLF BALL NOT MOVING
CAR AT REST
Friction pair= grass surface and ball
Friction
Friction pair= tires and road surface
MOVING SKATES
Friction
Yolanda Guerrero/VIPS

14. FRICTION CARPET SIDEWALK DIRT SURFACE SURFACE WITH LESS FRICTION ?
Yolanda Guerrero/VIPS

15. Clicker questions #1 What force opposes (tries to stop) motion?
A) gravity
B) friction
C) inertia
D) momentum

16. Clicker questions #2 Which surface would have the MOST friction?
A) a smooth road
B) an icy sidewalk
C) a tile floor
D) a grass field

17. Clicker questions
#3 Which of the following is an example of a balanced force?
A) When you sit on the ground, gravity pulls you down, but the floor pushes you up
B) When a truck takes off from a stoplight and overcomes the force of gravity.

18. Clicker questions
#4 Which of the following statements about gravity is true?
A) Gravity is a force that pushes us towards the ground.
B) Gravity is a force that pushes us upwards.
C) Gravity is a force that pulls us toward the ground.
D) Gravity is a force that pulls us upwards.