Speed Flashcards
Distance:
the length of the space between one point and another
Speed
The distance travelled per unit of time
Time
A measurable period in which event or event occurs
Scalar
A physical quantity that has magnitude only.For example,time
Vector
A physical quantity that has both magnitude and direction
Displacement
In a given direction.For example, 50m north est.It is also the shortest distance between two points
Velocity
Speed in a given direction.For example,100km/h south.Velocity of an object can be calculated by dividing the displacement of an object by the time taken to undergo that displacement
Distance-time graph
Distance-time graph Shows the distance something travels over the time taken to travel that distance. It is normally drawn by plotting the distance travelled on the y-axis and the time taken for the journey on the x-axis.
Acceleration
The change in velocity per second
Force
Forces explain why an object moves the way it does, why things stretch, twist, tear, snap, bend, break, speed up, slow down and change shape. Pushes and pulls are types of force.
Non-contact forces
Forces where objects do not have to be in contact for the forces to occur.
Contact forces
Two objects have to be in contact for these forces to occur.
Interaction pair
Pairs of forces that occur together.
Newton meter
A device used to measure forces. Also known as a spring balance.
Force meter
Used to measure forces digitally.
Balanced
When an object does not move because competing forces cancel each other out, we say the forces are balanced.
Equilibrium
An object is in equilibrium when it is subject to balanced forces.
Unbalanced
When one force on an object is stronger than another force, the forces are unbalanced. Unbalanced forces cause objects to speed up, slow down or change direction.
Dynamic equilibrium
When an object has balanced forces acting upon it when it is moving
Friction
A force that opposes motion when two objects are placed in contact.
Drag forces
Forms of friction, such as water resistance and air resistance.
Lubrication
Friction between solids can be reduced by using lubrication. Examples of lubricants include oil and wax.
Streamlining
Involves creating a smooth surface and an aerodynamic shape. Drag forces in wind and air can be reduced by streamlining.
Deform
When forces compress or stretch objects, they deform them.
Compress
When a material is compressed, the material’s particles move closer together.
Stretch
When a material is stretched, the material’s particles move further apart.
Reaction
The force applied by an object in response to another force.
Elastic
Any object that is able to restore its shape after it has been extended or compressed is known as an elastic object.
Elastic limit
The point at which an elastic object will not restore its shape.
Pressure
A measure of the force exerted per unit area of an object.
Gas pressure
As gas particles move around, they collide with other objects and with each other. This force, applied over an area, causes gas pressure. The faster the gas particles move, the more force they exert, so the greater the pressure is.
Atmospheric
The pressure exerted by the Earth’s atmosphere. Atmospheric pressure affects weather.
Density
A measure of how much matter is in the object compared to how much space it takes up. It is the ratio of mass to volume.
Buoyancy
If the upthrust that results from the pressure of a liquid is large enough, it will keep an object afloat, or buoyant.
Upthrust
The upward force exerted by a liquid. Pressure in liquids increases with depth, which means the bottom of something in a liquid will always feel more pressure than the sides because this point is the deepest.
Archimedes’principle
States that an object placed in water will feel an upthrust equal to the weight of the water it displaced.
