Revision-Forces Flashcards
When do contact forces react?
When surfaces are in contact.
What are forces measured in?
Forces are measured in Newtons(N).
What is stress?
Stress is when you stand on a surface and exert pressure onto the ground
What is the pressure that air exerts on you called?
Atmospheric Pressure
What is it called when objects change shape?
Deformation
If you double the on a spring, what will happen to the extension?
The extension will double.
What is the name of the law where if you double the force the extension doubles?
Hooke’s Law
What is compression?
Compression is when forces squash an object.
What is tension?
Tension is when forces squash an object.
What does the floor do when you are standing on it?
The floor pushes you up.
What is the elastic limit?
When a spring will not go back to it’s original form.
Why do fluids exert pressure on a surface?
Because of the collisions with a surface.
Atmospheric pressure decreases with……………………….
Height
Water pressure increases with………….
Depth
What is fluid pressure or stress on a surface measured in
N/m squared or N/cm squared
What is the turning effect of a force called
A moment
How do seesaws balance?
Clockwise moments equal the anticlockwise moments.
What do springs and ropes produce when you stretch them?
They produce a tension
What does it mean when there is equilibrium?
Two opposing forces are equal to each other; the object doesn’t move.
What can forces do to objects?
Forces can deform objects.
What is the resultant force in equilibrium?
The resultant force is zero.
What can friction be reduced by?
Friction can be reduced by lubrication.
What do snowshoes do?
Snowshoes increase the area of your feet, the stress is less.
What do studs do?
Studs increase the grip on the ground
