Space and forces YR7 Flashcards
What do forces do
Change the shape, speed or direction of an object
What is the unit and unit symbol of forces
Newton (N)
How do you show a force on a diagram
Use an arrow
What does the length of a force arrow tell us
The size of a force
What is another name for the size of a force
The magnitude
What do we call the drag force that tries to stop something moving in air
Air resistance
What is the formula for weight
W=mg
What are the two main types of forces
Contact and Non-contact
What force is caused by a magnet
Magnetism
What is the name of the one force that does the same job as 2 or more forces
The resultant force
What does the direction of a force arrow tell us
the direction the force is pointing in
If 2 forces are acting in the same direction, how do you work out the resultant force
Add the 2 forces together
If 2 forces are acting in the opposite directions, how do you work out the resultant force
Subtract the 2 forces
What are the 3 main non-contact forces
Weight(gravitational force)
Magnetism
Electrostatic
What are the 8 contact forces called
Air resistance
Water resistance
Friction
Upthrust
Thrust
Lift
Tension
Normal contact force (reaction)
