Interactions (force) Flashcards
What is a force
A force is oush or pull acting on an object. Forces act in opposite ways.
What is a contact force
A contact force is something that happens from physical contact with it
What is a non-contact force
A non-contact force is when an object moves without any physical contact
What are Balanced forces
When two forces acting on an object are equal in size but act in opposite directions.
What are unbalanced forces
When two forces acting on an object are not equal in size.
How do you measure forces
You get a newton meter measured in newtons (N)
How do you use a newton meter
- Hang the object on the hook of the newton meter
- Pull at a constant speed and measure how much newtons it is.
What is friction
Friction is a force that acts when two objects rub together. When the two objects appear to be smooth, there is less friction. When two objects are rough, there is a greater amount of friction.
What is air resistance
Air resistance is a drag force. Drag forces slow things down. As an object moves through the air you are moving the air particle out of the way.
What is water resistance
Water resistance is the same as air resistance but with water as you push through the water particles
What is streamlining
Shaping an object to go though the air or water particles easier
What are the pros of having something streamlined
For a vehicle it can move faster but also reduce its fuel consumption
What are some examples of when we reduce friction
Skiers wax the bottom of their skis to reduce friction between the snow, ice skaters sharpen their skates to reduce the area of metal in contact with the ice.
How else can we reduce friction
A smaller surface area can reduce friction
True or false. The pointier the shape of the object the faster it goes down a tube of water
True
