Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
physics mechanics
mechanics
| Term | Definition |
|---|---|
| Density | the density of a substance is its mass per unit volume Formula: p=m/v |
| mass | the mass of a body is the quantity of matter making up a body |
| Weight | The weight of a body is the force of gravity on the body. w= mass x gravity gravity=10N |
| moment | the moment of a force about a point its the product of the force and the perpendicular distance of its line of action from the point. moment = force x perpendicular distance. T= F x d |
| CONDITIONS FOR EQUILIBRIUM | the resultant force on the body is equal to zero The sum of clockwise moments about any point id equal to the sum of anti-clockwise moments about the same point. |
| centre of gravity | This is the point through which the relative gravitational force acts on the body. |
| Hookes law | Hookes law states that the force applied to a spring is proportional to its extension. F=kx |
| Proportional limit | This is the point beyond which any further increase in the load to a spring will produce an extension that is no longer proportioanl to the force. |
| elastic limit | This is the point beyond which any further increasing in the load to the spring will produce a permanent stretch(plastic deformation) or loads within the elastic limit their is elastic deformation where the spring returns to original length upon unloadin |
| velocity | v = u + at. v² = u² + 2as. s = ut + ½at² |
| acceleration | v-u/t |
| speed | d/t |
| newtons first law | A body continues at rest or in uniform motion unless acted on by a resultant force. F=0 |
| newtons second law | The rate of change of momentum of a body is proportional to the applied force and taks the direction of the force. Fr= m(v-u)/t |
| newtons third law | If a body A exerts a force on body B, then body B will exert a equal but oppositely directed forceon body A. |
| linear momentum | Linear momentum of a body is the product of its mass and its velocity. momentum= m x v |
| law of conservation of linear momentum | states that in the absence of an external force, the total momentum of a system of bodies is constant. |
| work/energy | work= force x displacement (J) |
| power | =work/time (W) |
| kinetic energy | Ek= 1/2 mv^2 |
| change in gravitational potential energy | = mass x gravity x change in height |
| principle of conservation of energy | states that energy can either be created or destroyed but can be transferred from one type to another. |
| efficiency | useful work/energy output/ work/energy input x 100 |
| pressure | the force acting noemally per unit meter P= f x a (Nm^-2 |
| change in pressure | pgh (density x gravity x height) |
| total pressure | pgh + pressure of water |
| Archimedes' principle | states that when a body is completely or partially submerged in a fluid, it experiences an upthrust equal to the weight of the fluid displaces. |
| principle of moments | states that when a body is in equilibrium the sum of the clockwise moments about any point is equal to the sum of the anticlockwise moments about the same point. |
Created by:
Robbi-Ann
Popular Physics sets