Motion and Design Quarter 2 2012-2013.

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Presentation transcript:

Motion and Design Quarter 2 2012-2013

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.

PUSH OR PULL = FORCE Yolanda Guerrero/VIPS

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

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

UNBALANCED FORCES Yolanda Guerrero/VIPS

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

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?

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

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

Gravity continues pulling Ground also pushes Yolanda Guerrero/VIPS

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

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

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

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

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

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.

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.