Forces and Magnets CSV Flashcards
What is the unit of force
Newtons
What do forces do
Make things speed up/down or change shape or maintain at rest
What are the 7 types of forces
Push, pull, magnetism, upthrust, gravity & support
Which direction do frictional forces act
Opposite motion
A space craft which is moving in space with no force acting on it will
Move at a constant speed
Two ways to reduce friction are
Oil, streamline shape, bearings
What affects braking distances on cars
Speed, road surface, drink
Name the 3 magnetic metal elements
Iron, cobalt, nickel
What is the law of attraction and repulsion
Like poles repel, unlike poles attract
Why does a magnet line up in the direction it does when left to swing freely
It is lining up with the earthís magnetic field, north pole pointing north
Where is magnetism most intense
At the poles
The arrows on lines of force go out of
North into South
How do you make a magnet
By stroking a piece of iron/steel with a magnet
How can you destroy a magnet
Heat it, hammer it or drop it
How do you increase the strength of an electromagnet (3 ways)
Increase current, increase coils or add a soft iron bar as the core
