Studied by 7 people
What units do you measure force in?
Newtons
Define “friction”
A force that opposes motion
When two surfaces rub together, friction is caused. This friction causes:
Heat
How can friction be reduced?
By using lubricants, such as oil
What is the formula that links unbalanced force, mass and acceleration?
F = ma
How do ice particles move?
They don’t move, only vibrate
How do water particles move?
They move and slide around each other
How do steam particles move?
They move freely and quickly
What happens when a liquid boils to a gas?
The particles absorb heat energy and begin to vibrate faster, increasing the separation between them
Why does evaporation lead to cooling?
The water particles take away heat energy when the sweat turn from liquid to gas. Because of this, the original surface gets cooler.
How does a foil sheet reduce heat loss?
The foil sheet prevents the heat particles from escaping, since there’s a surface in top of them
