Forces Flashcards
What is a field?
A field is a special region where a force experiences another force.
What is a force?
A force can be a push or pull.
What can forces change?
Forces can change the direction that the object is moving in, and even the shape of the object.
What is a Contact Force?
A Contact Force is when you are touching something.
What is a Non-Contact Force?
A Non-Contact Force is when a force acts at any distance, even if they are not touching.
What are examples of Contact Forces?
Friction and air resistance are both Contact Forces.
What is gravity classified as?
Gravity is a non-contact force because nothing is touching to start the force of gravity.
What are Interaction Pairs?
Forces always come in pairs. These are called Interaction Pairs.
How do you measure force?
You measure force with a Newtonmeter.
In what unit are forces measured?
Forces are measured in Newtons.
What can forces do to objects?
Forces can compress or stretch objects.
How are particles in a solid arranged?
The particles in a solid are joined together by bonds.
How much can solids be compressed?
Solids are compressed only a small amount when you apply a force to them.
What is a reaction force?
A support force from a chair is called a reaction force.
What is extension?
The amount that you stretch something is called the extension.
What happens if you double the force on a spring?
If you double the force on the spring, the extension will double. This is Hooke’s Law
What is the elastic limit?
The point where an elastic object doesn’t reach its original shape is called elastic limit.
What does friction do?
Friction grips objects.
How can you reduce friction?
If you want to reduce friction, then use a liquid to lubricate the surfaces. It makes them less rough and they can move across each other easily.
What are drag forces?
Water resistance and air resistance are drag forces.
How does a dolphin create drag force?
As a dolphin moves through the water, it pushes the particles away. This creates a drag force, which slows it down.
What are parachutes designed to do?
Parachutes are designed to slow down racing cars and skydivers. The contact with the air produces a drag force to slow them down.
What does streamlined mean?
If something is streamlined, that means the air can move around the object easily and efficiently, therefore increasing the speed of the object.
What are magnetic and electrostatic forces?
Magnetic and electrostatic forces are non-contact forces.
