Section 8 - Forces And Their Effects Flashcards
(27 cards)
How do objects interact?
By exerting forces in each other
What kind of forces is there if the objects are touching?
Contact force
What is a normal contact force?
A force that acts at right angles to the surface as a reaction to a force on the surface
How is outburst balanced?
By a Non-contact force called gravity
What does gravity occur between?
Any two objects that have mass
Why does the moon stay in orbit around the earth?
Because two bodies are attracting each other
What do we use to represent gravitational forces between two objects?
Vectors
What are action reaction forces?
A pair of forces acting on different objects in different directions
What is a force field?
The space around an object where it can affect other objects
So why does the moon and earth attract each other?
Because the moon is within the earths gravitational field
Name 2 forces that affect objects but are not in direct contact
Magnetism and static electricity
Name 3 magnetic metals
Iron, Nickel and cobalt
What is the space around a magnet where it can attract other magnets called?
Magnetic field
What does an object charged with static electricity have?
An electric field
What do two objects in an electrical field with the same charge produce?
A pair of forces that are equal in size and acting in opposite directions
When is a force resultant (or net)?
If the forces are of equal size but in opposite directions
Are the forces on a resultant force balanced?
Yes
If a force is balanced, what resultant force does it have?
0
What would you use to show forces on an aeroplane?
A free body force diagram
What diagram do you use to work out a resultant force?
A scale diagram
How do you draw a scale diagram?
Draw arrows at the correct angles to represent the forces (length of each arrow represents the size of force) / draw connecting lines to make a parallelogram / the resultant force is the diagonal of the parallelogram
What does the length of the arrows in a free body force diagram show you?
The size of the force
What can help a plane for example to climb when accelerating up?
Acceleration
How can you work out how much thrust is pushing the plane, for example, upwards and how much is pushing it forwards by resolving the thrust force into two component forces at right angles?
Scale diagram
