Term
|
Definition
A: A force is a push or a pull that acts on an object. Force can set a motionless object into motion, change the shape of the object, stop a moving object, and change the motion of the object. Force is often classified into two groups; contact forces (Elastic, tension, friction) and action-at-a-distance forces (Gravitational, electrostatic, magnetic).
[image] |
|
|
Term
|
Definition
A: Pressure is the amount of force on a given area on an object.
The formula for pressure is force over area. Pressure is measured in Pa or kPa. P = F
__
A
[image]
|
|
|
Term
|
Definition
A: Area is the amount of space taken up by a two-dimensional
object on a flat plane. To acquire the area of something, multiply the length by the width, the area is measured in metres squared. |
|
|
Term
Q: What is friction force? |
|
Definition
A: Friction force works when two surfaces rub against each other thus causing it to slow down or stop movement. For example, when you're skating and your skate blades cut into and rub against the ice in order to stop
[image] |
|
|
Term
Q: What is surface tension? |
|
Definition
A: Surface tension is the property of a liquid in which the surface of a liquid serves as a thin skin. For example, although a CD is denser than water, it floats when you gradually rest the CD on the water, this is because of the surface tension of the water.
[image] |
|
|
Term
|
Definition
A: Compression is the decrease in volume caused by a force. Gases can be easily compressed because their particles are spaced far apart whereas a solid and a liquid's particles are close together which makes them incompressible.
[image] |
|
|
Term
|
Definition
A: A pascal is a single unit of pressure named in honour of Blaise Pascal.
[image] |
|
|
Term
|
Definition
A: Cohesion is the strength of the particles of an object or fluid attract one another. Cohesion is the force of attraction most responsible for surface tension.
[image] |
|
|
Term
|
Definition
| A: A kilopascal is 1000 Pa (pascals). This unit is used more frequently when comparing pressures. |
|
|
Term
|
Definition
| A: Weight is how strong gravity pulls on an object. On the Moon, you would weigh 1/6th of your weight right now and on Jupiter, you would weigh 2.35 times more than you do on Earth. |
|
|
Term
|
Definition
A: Adhesion is the property of fluids that attracts two different objects and fluids to one another.
[image] |
|
|
Term
|
Definition
A: Water molecules have polarity; one end of the water molecule is slightly positive and the other end is slightly negative. The positive end of the water molecules is attracted to the negative end.
[image] |
|
|
Term
|
Definition
| A: The flow rate is the speed a fluid flows from one place to another, you may use this to compare the viscosity of different fluids. |
|
|
Term
|
Definition
A: Viscosity is a fluid's resistance to flow, the slower the fluid flows, the higher the viscosity
[image] |
|
|
Term
|
Definition
A: Deformation is the change of shape without compressing the object. For example, a ball that hits the ground deforms, as it deforms, it stores elastic energy which makes the ball bounce back.
[image] |
|
|
Term
Q: What is an action-at-a-distance force? |
|
Definition
A: Action at a distance forces can apply forces to objects without contact. Gravitational forces, electrostatic forces, and magnetic forces are all action-at-a-distance forces.
[image] |
|
|
Term
Q: What are electrostatic forces? |
|
Definition
A: Electrostatic forces can cause a pushing or pulling force. Electrostatic force is the excess of positive or negative charges. Those of the same charge repel each other, while negative charged objects and positive charged objects attract each other.
[image] |
|
|
Term
Q: What is a magnetic force? |
|
Definition
| A: A magnetic force acts on only specific metals and compounds. Electromagnets possess a field surrounding them that exerts pushing and pulling forces.[image] |
|
|
Term
Q: What is a gravitational force? |
|
Definition
| A: Gravitational force is the force of attraction between everything that contains mass in the universe. The force of the gravitation depends on two factors; the masses of both objects and how far apart they are to one another.[image] |
|
|
Term
Q: What is a contact force? |
|
Definition
A: Contact forces are forces that only have an an effect on objects they have contact with. Friction force, tension force, and elastic force are all contact forces
[image] |
|
|
Term
Q: What is a tension force? |
|
Definition
A: Tension force can be experienced when a wire or rope is pulled at either end.
[image] |
|
|
Term
Q: What is an elastic force? |
|
Definition
A: Elastic force is exerted when an object that is spring-like restores itself back to its original form after being compressed and or stretched.
[image] |
|
|
Term
Q: What is an unbalanced force? |
|
Definition
A: Unbalanced forces causes an object to change in motion (speed up, change directions, or slow down). The pushed object will move in the direction it is pushed by the more powerful force.
[image] |
|
|
Term
Q: What is a balanced force? |
|
Definition
A: Balanced forces oppose each other in opposite directions and are equal in strength. Forces can also be balanced while an object is in motion.
[image] |
|
|
