Chapter 3 - Forces And Movement Flashcards
(38 cards)
WHAT IS A FORCE?
A pull or a push
WHAT IS MOVEMENT?
Changing position or part of an object.
Forces are all around you. Can you see them?
You cannot see them. You can only see what they do. They are everywhere. They cause movement. They can make things go slower or faster.
Name 4 forces.
Gravity
Muscular
Buoyancy
Friction
WHAT IS GRAVITY?
The pull of objects toward a planet.
PULLING FORCE.
EXAMPLES OF GRAVITY
- an apple falling from a tree
- a ball rolling down a hill
- Taya walking on earth instead of floating
- a child going down a slide
- food sitting on a table
WHAT IS MUSCULAR FORCE?
The pull of muscles on bones that allows us to move in different directions.
MOVEMENT FORCE
EXAMPLES OF MUSCULAR FORCE
- walking
- lifting an object
- bouncing a ball
- riding your bike
- dancing
- typing on a computer
WHAT IS BUOYANCY?
Upward pushing force of water and other liquids on objects.
Example: Your body pushes down on the water and the water pushes up on you to keep you afloat.
PUSHING FORCE
EXAMPLES OF BUOYANCY
- a boat floating
- an apple floating in a bucket
- a buoy in the lake floating
WHAT IS FRICTION?
The rubbing ,sliding and pushing of two objects against each other.
SLIDING FORCE
EXAMPLES OF FRICTION
- walking (feet and floor)
- rubbing your hands together
- skiing (skis and snow)
- ironing (clothes and iron)
- driving a car or riding a bike (tires and road) - your tires are not smooth so that they can grip the surface better
FRICTION: Is there more or less friction on rough surfaces?
= more friction
Example: Driving on a dry road compared to a wet road.
FRICTION: Is there more or less friction on smooth surfaces?
= less friction
Example: slide
Why do we want to increase friction?
To make things less slippery and in some cases safer.
Why do we want to decrease friction?
Too much rubbing can wear out things.
To allows things to rotate easily.
Less energy is used.
Do some situations have more than one force involved?
YES
MULTIPLE FORCES AT WORK - EXAMPLES
Canoe moving in the water - buoyancy and friction and gravity.
WHAT ARE 2 FORCES THAT CAN PUSH OR PULL?
MAGNETIC FORCE and STATIC FORCE
WHAT IS A MAGNETIC FORCE?
The pull of some metal objects by a magnet OR the pushing away of two like poles.
Objects with same charge push away (REPEL).
Objects with different charges pull toward each other.
WHAT IS A STATIC ELECTRIC FORCE?
A push or pull caused by a buildup of charged particles.
Objects with the same charge push away.
Objects with different charges pull toward each other.
WHAT CAN A FORCE DO?
- can make an object move faster
- can make an object move slower
- can change the direction that an object is moving in
- can change the shape of an object
What is DIRECTION?
Which way an object is moving.
It could be right, left, north, south, east, west, up, down, forwards, backwards, etc.
WHY DO ENGINEERS DEVELOP SAFETY DEVICES?
- moving objects want to keep moving unless a force acts on them
- to slow things down or stop them from moving safety devices are used