Year 9 Physics Flashcards
Acceleration
The amount by which speed increases in one second.
atmospheric pressure
Pressure caused by the collisions of air molecules that produce a force on an area.
average speed
The total distance travelled in the total time taken for a complete journey.
Centre of gravity
The point in an object where the force of gravity seems to act.
Centre of mass
The point in an object where the mass of an object seems
to act.
Compressed
Squashed into a smaller space.
Density
The mass of a material in a certain volume.
Distance-time graph
A graph that shows how far an object moves each second.
Gas pressure
The force exerted by air particles when they collide with a surface.
Incompressible
Cannot be compressed (squashed)
Instantaneous speed
The speed at a particular moment.
Law of moments
An object is in equilibrium if the clockwise moments equal the anticlockwise moments.
Liquid pressure
The pressure produced by collisions of particles in a liquid.
Moment
A measure of the ability of a force to rotate an object about a pivot.
Relative motion
The difference between the speeds of two moving objects, or of a moving and a stationary object.
