1775174
Descripción
Pregunta 1
Pregunta
How can you measure the speed of an object?
Respuesta
-
metres per second (m/s)
-
kilometres per hour (kph)
-
miles per hour (mph)
-
yards per minute (ypm)
Pregunta 2
Pregunta
The faster the speed of an object:
Respuesta
-
the greater the distance it travels
-
the lighter the object is
-
the shorter the time it takes to travel a particular distance
-
the quicker the acceleration of the object
-
the larger the surface area of the object, therefore creating more drag
Pregunta 3
Pregunta
speed = .... ?
Respuesta
-
distance * time
-
((u+v)/2) * t
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distance / time
-
speed / distance
Pregunta 4
Pregunta
Why is average distance used?
Respuesta
-
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?
Respuesta
-
They generally take 3 pictures of several vehicles a certain time apart
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they generally take 2 pictures of 1 vehicle a certain time apart
Pregunta 6
Pregunta
What is the formula for calculating the speed of a car using speed cameras?
Respuesta
-
speed of car = distance travelled between pictures/ time taken between 1st and 2nd picture
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speed of vehicle = distance travelled/ time taken between 2nd and 1st picture
Pregunta 7
Pregunta
(Distance-time graphs) The steeper the gradient....
Respuesta
-
the greater the distance travelled within a short amount of time
-
the greater the speed
-
the quicker the accelertion
Pregunta 8
Pregunta
(distance - time graphs) a straight diagonal line shows...
Respuesta
-
a steady speed
-
acceleration
Pregunta 9
Pregunta
(distance-time graphs) a straight horizontal line (---------) shows.....
Respuesta
-
No movement (stationary)
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The object is going backwards
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The object is travelling in a straight line
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....
Respuesta
-
The object is decellerating
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Object is moving slower
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object is going backwards
Pregunta 12
Pregunta
How do you work out the speed of an object on a distance-time graph?
Respuesta
-
divide the area of the time and divide it by the length of the distance
-
take any 2 points on the graph and read off the distance travelled for that part of the journey and the time taken to get there
Pregunta 13
Pregunta
the acceleration / deceleration of an object is..... ?
Respuesta
-
the change in speed per second
-
how fast the object is moving
Pregunta 14
Pregunta
how do you measure acceleration and deceleration?
Respuesta
-
acceleration = measured in: m/s * m/s (a.k.a. metres per second squared)
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deceleration = measured in: -m/s * -m/s (a.k.a. - metres per second squared)
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m/s, kph or mph
Pregunta 15
Pregunta
How do you work out the acceleration of a moving object?
Respuesta
-
change in speed/ time taken for change in speed
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acceleration = (final velocity - initial velocity) / time
-
s = ((u + v) /2) * t
Pregunta 16
Pregunta
Example question: a car accelerates at 1.5 m/s2 for 12 seconds.
Calculate the change in speed of the car
Respuesta
-
18 m/s
-
8 m/s
-
8 m/s2
Pregunta 17
Pregunta
(speed-time graphs) a horizontal line means...
Respuesta
-
No acceleration (0 m/s2)
-
Constant acceleration
Pregunta 18
Pregunta
(speed-time graphs) a positive diagonal line shows....
Respuesta
-
acceleration
-
an increase in speed
Pregunta 19
Pregunta
(speed-time graphs) a negative diagonal line shows..
Respuesta
-
deceleration
-
going backwards
Pregunta 20
Pregunta
(speed-time graphs) the area underneath the speed-time can be used to measure....
Respuesta
-
distance travelled
-
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
-
multiply the y-axis by the x-axis
Pregunta 22
Pregunta
What is Force measured in?
Respuesta
-
Newtons
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Gravity
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kg
Pregunta 23
Pregunta
Forces can cause objects to....?
Respuesta
-
accelerate
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decellerate
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to be heavier
Pregunta 24
Pregunta
Weight causes an object to have.... ?
Respuesta
-
gravity
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force
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more acceleration
Pregunta 25
Pregunta
How does friction affect a car?
Respuesta
-
causes it to slow down
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causes sparks in the wheels
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makes it go faster
Pregunta 26
Pregunta
What happens when a sky diver opens up a parachute mid-jump?
Respuesta
-
Air resistance
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Friction
-
Gravity
Pregunta 27
Pregunta
What happens to a sky-diver mid-jump when air resistance and weight are balanced?
Respuesta
-
they stay at a constant speed
-
they don't move and stay stock-still in mid-air
-
they accelerate
Pregunta 28
Pregunta
if an unbalanced force acts, the acceleration of an object will depend on: ?
Respuesta
-
the force applied to the object
-
the mass of the object
-
the speed of the object
-
the surface area of the object (larger surface area will create more drag)
-
the density of the object
Pregunta 29
Pregunta
more mass = ... ?
Respuesta
-
= more acceleration
-
= less acceleration
-
= less kinetic energy
Pregunta 30
Pregunta
What is the formula for the relationship between force, mass and acceleation
resultant force (N) = .... ?
Respuesta
-
= mass (kg) * acceleration (m/s2)
-
= work done * time (s)
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= acceleration (m/s2) / mass (kg)
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