Karteikarten
P4 Science
Karten in diesem Stapel (37)
- 1Define speedHow far it travels during a certain amount of time
- 2What's the equation for speed with its units?Speed(m/s) = distance travelled(m)
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Time taken(s) - 3Why do we calculate average speed?Speed of a vehicle tends to change over a period of time.
- 4How do we find the value of instantaneous speed?Calculate it by using a small sample of the journey.
- 5What is the displacement of an object?The distance from its start point in a straight line
- 6What is displacement expressed as?A distance with a direction
- 7Define velocityAn objects speed in a certain direction
- 8Velocity equationaverage velocity(m/s) = displacement(m)
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time taken(s) - 9What can distance-time graphs be used for?To visualise a journey
- 10What is plotted on the x and y axis of a distance-time graph?Time - X
Distance - Y - 11What does a straight line mean on a distance-time graph?The vehicle is travelling at a constant speed
- 12What does a horizontal line mean on a distance-time graph?The vehicle is stationary
- 13On a distance-time graph, the (?) the line the (?) the vehicle.Steeper, faster
- 14What does a curved line mean on a distance-time graph?Speed is changing
- 15On what can return journeys be visualised on?Displacement-time graph
- 16On a displacement-time graph what happens when it reaches its start point and what happens when it goes past its starting point?The displacement will be 0 when it reaches its starting point and goes into negative numbers if it travels past its starting point
- 17Define accelerationWhen the speed of an object increases and is measured in m/s2
- 18Acceleration equation and unitsAcceleration(m/s2) = change in speed(m/s)
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time taken(s) - 19What must there be to cause deceleration or acceleration?A net force
- 20What happens when the net force is 0?The acceleration is 0
- 21What is acceleration defined as to do with velocity?The rate of velocity
- 22What is a speed-time graph used for?Show the changes in speed over the journey
- 23What is on the x and y axis on a speed-time graph?Speed - X
Time - Y - 24What does a horizontal line on a speed-time graph mean?Means that the speed is constant
- 25What does a horizontal line going along the x axis on a speed-time graph mean?The object is stationary
- 26What does a straight line going vertically up or down mean on a speed-time graph?Acceleration or deceleration
- 27What does a velocity-time graph show?Direction
- 28What does a positive velocity and negative velocity mean on a velocity-time graph?Positive - means the vehicle travels one way and negative - opposite way
- 29Define forcePush or pull between two objects that always come in pairs
- 30Define a repulsive forceWhen a force pushes
- 31Define an attractive forcePulls things closer
- 32The size of the force is equal/inequalEqual
- 33How is a force represented on a diagram?As an arrow
- 34Define frictionA force between two surfaces that are sliding over each other that tries to oppose the motion
- 35What does the size of friction depend on?Roughness of the surface
How hard the surfaces are - 36What is limiting friction?When friction reaches a maximum volume and will start to move
- 37Why is lubrication used on machines?To reduce friction on moving machines to stop them from overheating and wearing out.
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- Beschreibung
- Karteikarten am P4 Science, erstellt von mollytils am 29/10/2015.
- Erstellt von
- mollytils
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