Pregunta 1
Pregunta
How can you measure the speed of an object?
Pregunta 2
Pregunta
The faster the speed of an object:
Respuesta
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the greater the distance it travels
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the lighter the object is
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the shorter the time it takes to travel a particular distance
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the quicker the acceleration of the object
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the larger the surface area of the object, therefore creating more drag
Pregunta 3
Respuesta
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distance * time
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((u+v)/2) * t
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distance / time
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speed / distance
Pregunta 4
Pregunta
Why is average distance used?
Respuesta
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to make the answer more reliable
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the speed may change over a given distance, so the average distance over the whole journey is used
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the speed may change direction, so it is better to use an average DISTANCE instead of speed
Pregunta 5
Pregunta
How do speed cameras work?
Pregunta 6
Pregunta
What is the formula for calculating the speed of a car using speed cameras?
Pregunta 7
Pregunta
(Distance-time graphs) The steeper the gradient....
Pregunta 8
Pregunta
(distance - time graphs) a straight diagonal line shows...
Respuesta
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a steady speed
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acceleration
Pregunta 9
Pregunta
(distance-time graphs) a straight horizontal line (---------) shows.....
Pregunta 10
Pregunta
(distance-time graphs) a steeper diagonal line means....
Respuesta
-
an increase in speed (object is going faster than it was before)
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object is moving at a steady speed
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object is accelerating
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car has gone past the speed limit
Pregunta 11
Pregunta
(distance-time graphs) a diagonal line going downwards means....
Pregunta 12
Pregunta
How do you work out the speed of an object on a distance-time graph?
Pregunta 13
Pregunta
the acceleration / deceleration of an object is..... ?
Pregunta 14
Pregunta
how do you measure acceleration and deceleration?
Pregunta 15
Pregunta
How do you work out the acceleration of a moving object?
Pregunta 16
Pregunta
Example question: a car accelerates at 1.5 m/s2 for 12 seconds.
Calculate the change in speed of the car
Pregunta 17
Pregunta
(speed-time graphs) a horizontal line means...
Respuesta
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No acceleration (0 m/s2)
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Constant acceleration
Pregunta 18
Pregunta
(speed-time graphs) a positive diagonal line shows....
Respuesta
-
acceleration
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an increase in speed
Pregunta 19
Pregunta
(speed-time graphs) a negative diagonal line shows..
Respuesta
-
deceleration
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going backwards
Pregunta 20
Pregunta
(speed-time graphs) the area underneath the speed-time can be used to measure....
Respuesta
-
distance travelled
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total time taken
Pregunta 21
Pregunta
How would you calculate the total distance travelled on a speed-time graph?
Respuesta
-
Cut the graph into triangles and rectangles, then find the area for each shape and add them all up
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multiply the y-axis by the x-axis
Pregunta 22
Pregunta
What is Force measured in?
Pregunta 23
Pregunta
Forces can cause objects to....?
Respuesta
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accelerate
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decellerate
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to be heavier
Pregunta 24
Pregunta
Weight causes an object to have.... ?
Respuesta
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gravity
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force
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more acceleration
Pregunta 25
Pregunta
How does friction affect a car?
Pregunta 26
Pregunta
What happens when a sky diver opens up a parachute mid-jump?
Respuesta
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Air resistance
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Friction
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Gravity
Pregunta 27
Pregunta
What happens to a sky-diver mid-jump when air resistance and weight are balanced?
Pregunta 28
Pregunta
if an unbalanced force acts, the acceleration of an object will depend on: ?
Respuesta
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the force applied to the object
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the mass of the object
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the speed of the object
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the surface area of the object (larger surface area will create more drag)
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the density of the object
Pregunta 29
Pregunta
more mass = ... ?
Respuesta
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= more acceleration
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= less acceleration
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= less kinetic energy
Pregunta 30
Pregunta
What is the formula for the relationship between force, mass and acceleation
resultant force (N) = .... ?