Fichas
Mechanics Test
Fichas del conjunto (49)
- 1The formula for using kinetic to find the velocityV=√2Ek/m
- 2why would the actual speed of any object vary?Friction Force (created by air) acting to slow the objects speed down
- 3What is the principle of the conservation of energy?States that energy cannot be created or destroyed, but it can be transformed from one form to other form/s. It is impossible to make energy from nothing.
- 4The first reason why objects lose kinetic energy when traveling down?Kinetic energy is lost due to friction causing some energy to be converted into heat and sound energy.
- 5The second reason why objects lose kinetic energy when traveling downwards?The object is pushing through the air when traveling down, the air particles rubbing against the object creates air friction, which slows down the speed of the object, causing the object to lose kinetic energy.
- 6DistanceA measure of how much ground an object has covered when it travelled
metres (m) - 7TimeAn interval change that is measured to see how long an object is been covering ground for.
Second (s) - 8SpeedA measure of rate of motion at which an object covers a distance
- 9VelocityThe average speed of an object when moving in a particular direction
Unit: ms-1 - 10When an object is accelerating, what is it doing?Getting faster and covering more distance over time
- 11AccelerationThe rate at which an object changes it velocity
Unit: ms-2 - 12DecelerationThe rate at which an object reduces its velocity, a negative acceleration.
- 13Distance-time graphShows the time taken to cover a certain distance.
The gradient can be used to solve the speed of the object. - 14Constant SpeedWhen the speed of an object remains the same - it does not increase or decrease.
Time and Distance are increase constantly with each other. - 15StationaryThe object is not moving
Velocity = 0ms-2 - 16Fast constant speedThe object is travelling at a fast speed, but it's remaining the same fast speed.
A steepest the steepest, indicate the object covered a large distance in a short amount of time - 17Slow constant speedThe object is travelling at a slow speed but It's remaining the same slow speed.
The object has covered a short distance, in a long period of time. - 18Speed-time graphShows the speed an object has done over a certain amount of time.
The gradient = acceleration of the object.
Also can be used to find the distance the object has covered - 19Calculating Acceleration from a speed-time GraphGradient = acceleration
Gradient= change in y axis / change in x-axis - 20Find the distance from a rectangle on S-T-G Find the distance from a triangle on S-T-G Find the distance from a triangle/ rectangle on S-T-DArea=base x height
Area=1/2 x base x height
Area= (1/2 x base x height) + (base x height) - 21WorkWork (W) occurs when a force makes an object move from one place to another, resulting in a change of energy from one form to another
- 22Kinetic energyThe energy an object has when it is moving
- 23Gravitational potential energyThe energy an object gains due to the object's mass when it is lifed up.
- 24A Forcea push or pulls or twisted, that makes an object change its motion. A change in motion means that the object's speed or direction changes.
- 25Balanced Forceswhen all forces combine together to cancel each other, therefore the sum of the net force equals zero.
- 26What happened if a balanced force is acting on an object?The object's motion doesn't change meaning:
* object will travel at a constant speed or will be stationary - 27Unbalanced forceWhen all forces combine together and they don't cancel each other out, causing a net force that does not equal to zero.
- 28What happens if an unbalanced force is acting on an object?Object's motion changes
- 29ThrustA force that pushes an object in a certain distance
- 30MassThe amount of material (matter) in an object. measured in kilograms or grams.
Always stays constant, only changes will a person gain or loss material. - 31WeightA force which is the result of gravity pulling an object downwards. Measured in Newtons.
- 32FrictionA force which acts to stop or slow down the movement of an object. Or is the resistance which is produced instantly when an object tries to slide past another object.
- 33Gravity10Nkg^-1
- 34PressureThe amount of force put on a certain area.
Unit standard it measured in is 'Newtons per square metre' (Nm^-2) - 35Discuss the direction of the net force: (Next three slides) An object is travelling at a constant speed.Force acting in opposite direction will be balanced because the object is travelling at a constant speed. The object motion will not change, as the net force is balanced (net force = 0). Object will continue to travelling at a constant speed as long as the net force is balanced
- 36An object is acceleratingForce acting in opposite directions will be unbalanced because the object is accelerating. The object's motion will change, as when accelerating the object speed getting faster. The push force ^ than friction, why? Net force will be acting in the push direction.
- 37An object is deceleratingForce are acting in opposite directions will be unbalanced because the object is decelerating. The friction force ^ than thrust as Decelerating means the object's speed is slow down, friction causes an object to do that. So there will be a net force acting in the friction direction.
- 38Reduced friction by?- Lubrication
- Smooth surfaces
aerodynamic designs - 39Increase friction by?- dry rough surfaces
- materials that have rough surfaces (leather)
- tread of vehicles larger, rougher surface, more of a complexed pattern - 40State the relationship between a falling object's speed, leading surface and air resistance?Object's speed ^ causing a ^ leading surface, ^ in air resistance the object will encounter.
but, if air resistance > causing object's speed and leading surface to > - 41The concept of Pressure:Force applied over a large area = less pressure, why? force is spread out over that area
Force applied over a small area = alot of pressure, why? force is concentrated over that area - 42EnergyMakes things happen, and is the capacity to do work.
measured in Joules (J) - 43Gravitational potential energyThe energy an object gains due to their height above the ground. The unit Ep is measured in is Joules (J)
- 44Kinetic energyThe energy an object gains when it is moving
- 45WorkWhen a force makes an object move from one point to another, resulting in a change of energy from one form to another.
Unit measured in is joules (J) - 46PowerThe rate at which energy is changed.
Unit measured in is Watt (W) - 47Energy cannot be? Energy can be?created or destroyed
transformed from one form to another and transferred from one object to another - 48What can happen to energy when a object goes from the ground to a height?The enegry can be wasted as sound and heat energy due to friction and sometimes air resisitance as the ball through to the height.
The total energy at that certain height will be less than total enegry at the ground. - 49what does work =?the amount of work being transffered equal the amount of that type of energy that object
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- NCEA Level 1 (Physics ) Science Fichas sobre Mechanics Test , creado por Kaitlyn Selak el 30/05/2017.
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- Kaitlyn Selak
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