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### 27 Cards in this Set

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 What is speed Speed is the amount of time taken for an object to cover a certain distance How to calculate the average speed S = d/t Definition of acceleration Acceleration is the right of the change of velocity How to calculate Acceleration Acceleration= change of velocity/time What does a straight line show on a motion graph Constant speed What are the two types of forces Contact forces which means it is acted directly on the object and noncontact forces which means it acts at a distance on an object Definition of resultant force The resultant force I don't object is the net force found by adding up all the forces in one direction What is newtons first law Newtons first law means that an object will either continue to be stationary or moving in a straight line at a constant speed unless there is a resultant force acting upon it What is newtons second law Newtons second law means the post on an object is directly proportional to its mass multiplied by its acceleration What is newtons third law Newtons third law means that for every force applied to an object that is an opposite and equal reaction force What is terminal velocity Terminal velocity is when an object falls at a constant velocity in a fluid as the forces acting on it are equal What is the formula to work out density Density equals mass divided by volume How do you work out a moment Moment = Force X distance Why are doorhandles located at the opposite side of the door to the hinges The closer to the hinge a.k.a. the pivot to the handle them all fours is required to move the door therefore if you increase the distance less force is required at the moment stays constant How do you work out the pressure Pressure = force divided by area How does pressure in a fluid change when the fluid gets deeper The pressure in a survey to increases with depth this is because the force acting on it due to the weight of the water above is the largest How does a hydraulic work For a constant volume and temperature the pressure of the liquid stays the same What is static electricity Static electricity is the movie is when there is a buildup of charge if an object gains electrons it becomes negatively charged if it loses electrons it becomes positively charged Definition of electricity Electricity is the movement of charged particles normally electrons If two objects have collected static electricity with the same charge what would the object to do when place near each other They would repel each other Dangers of static electricity Static electricity can cause sparksThe force causes them to move across to quickly making a sPark When fuelling aeroplanes are connected to Earth by conducting wire why is this a vital safety measure Because the conductor is the wire as it prevents a buildup of charge as it is a good conductor and the electrons will travel or flow to the ground otherwise this could cause a spark resulting in a big explosion Why did TV screens become a dusty as they are dusted When you dust the screen becomes negatively charged due to friction through induction the dust particles are then attracted to the TV as the particles are positive they attract each other What is the law of charges Opposite charges will attract lost the same charges repel What is current and how is it worked out Current is the rate of flow of charge and current = charge divided by time What is the voltage and how is it measured Fault it is the energy per-unit charge and it is worked out by dividing energy by charge What ￼ Jules