1775174
Descrição
Questão 1
Questão
How can you measure the speed of an object?
Responda
-
metres per second (m/s)
-
kilometres per hour (kph)
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miles per hour (mph)
-
yards per minute (ypm)
Questão 2
Questão
The faster the speed of an object:
Responda
-
the greater the distance it travels
-
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
Questão 3
Questão
speed = .... ?
Responda
-
distance * time
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((u+v)/2) * t
-
distance / time
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speed / distance
Questão 4
Questão
Why is average distance used?
Responda
-
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
-
the speed may change direction, so it is better to use an average DISTANCE instead of speed
Questão 5
Questão
How do speed cameras work?
Responda
-
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
Questão 6
Questão
What is the formula for calculating the speed of a car using speed cameras?
Responda
-
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
Questão 7
Questão
(Distance-time graphs) The steeper the gradient....
Responda
-
the greater the distance travelled within a short amount of time
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the greater the speed
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the quicker the accelertion
Questão 8
Questão
(distance - time graphs) a straight diagonal line shows...
Responda
-
a steady speed
-
acceleration
Questão 9
Questão
(distance-time graphs) a straight horizontal line (---------) shows.....
Responda
-
No movement (stationary)
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The object is going backwards
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The object is travelling in a straight line
Questão 10
Questão
(distance-time graphs) a steeper diagonal line means....
Responda
-
an increase in speed (object is going faster than it was before)
-
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
Questão 11
Questão
(distance-time graphs) a diagonal line going downwards means....
Responda
-
The object is decellerating
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Object is moving slower
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object is going backwards
Questão 12
Questão
How do you work out the speed of an object on a distance-time graph?
Responda
-
divide the area of the time and divide it by the length of the distance
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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
Questão 13
Questão
the acceleration / deceleration of an object is..... ?
Responda
-
the change in speed per second
-
how fast the object is moving
Questão 14
Questão
how do you measure acceleration and deceleration?
Responda
-
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)
-
m/s, kph or mph
Questão 15
Questão
How do you work out the acceleration of a moving object?
Responda
-
change in speed/ time taken for change in speed
-
acceleration = (final velocity - initial velocity) / time
-
s = ((u + v) /2) * t
Questão 16
Questão
Example question: a car accelerates at 1.5 m/s2 for 12 seconds.
Calculate the change in speed of the car
Responda
-
18 m/s
-
8 m/s
-
8 m/s2
Questão 17
Questão
(speed-time graphs) a horizontal line means...
Responda
-
No acceleration (0 m/s2)
-
Constant acceleration
Questão 18
Questão
(speed-time graphs) a positive diagonal line shows....
Responda
-
acceleration
-
an increase in speed
Questão 19
Questão
(speed-time graphs) a negative diagonal line shows..
Responda
-
deceleration
-
going backwards
Questão 20
Questão
(speed-time graphs) the area underneath the speed-time can be used to measure....
Responda
-
distance travelled
-
total time taken
Questão 21
Questão
How would you calculate the total distance travelled on a speed-time graph?
Responda
-
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
Questão 22
Questão
What is Force measured in?
Responda
-
Newtons
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Gravity
-
kg
Questão 23
Questão
Forces can cause objects to....?
Responda
-
accelerate
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decellerate
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to be heavier
Questão 24
Questão
Weight causes an object to have.... ?
Responda
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gravity
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force
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more acceleration
Questão 25
Questão
How does friction affect a car?
Responda
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causes it to slow down
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causes sparks in the wheels
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makes it go faster
Questão 26
Questão
What happens when a sky diver opens up a parachute mid-jump?
Responda
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Air resistance
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Friction
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Gravity
Questão 27
Questão
What happens to a sky-diver mid-jump when air resistance and weight are balanced?
Responda
-
they stay at a constant speed
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they don't move and stay stock-still in mid-air
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they accelerate
Questão 28
Questão
if an unbalanced force acts, the acceleration of an object will depend on: ?
Responda
-
the force applied to the object
-
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)
-
the density of the object
Questão 29
Questão
more mass = ... ?
Responda
-
= more acceleration
-
= less acceleration
-
= less kinetic energy
Questão 30
Questão
What is the formula for the relationship between force, mass and acceleation
resultant force (N) = .... ?
Responda
-
= mass (kg) * acceleration (m/s2)
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= work done * time (s)
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= acceleration (m/s2) / mass (kg)
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