Forces

Question 1

Friction

Answer 1

Forces opposing motion which is caused by the interaction of surfaces moving over one another. It is called drag if one is a fluid.

Question 2

Contact force

Answer 2

A force that acts when an object is in contact with a surface, air or water.

Question 3

Force acting on an object moving through air or water that causes it to slow down.

Answer 3

Drag force

Question 4

The point beyond which a spring will not return to its original length when the force is removed.

Answer 4

Elastic limit

Question 5

Hooke’s Law

Answer 5

If you double the force on an object, the extension will double.

Question 6

Linear relationship

Answer 6

When 2 variables are graphed and show a straight line which goes through the origin, and they can be called proportional.

Question 7

The force exerted by air particles when they collide with a surface

Answer 7

Gas pressure

Question 8

The pressure caused by the weight of the air above a surface.

Answer 8

Atmospheric pressure

Question 9

Stress in solids

Answer 9

The effect of a force applied to a solid. Stress = force/ area.

Question 10

Equilibrium

Answer 10

State of an object when opposing forces are balanced.

Question 11

An object is in equilibrium if the clockwise moments equal the anticlockwise moments.

Answer 11

Law of Moments