1775174
Description
Question 1
Question
How can you measure the speed of an object?
Answer
-
metres per second (m/s)
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kilometres per hour (kph)
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miles per hour (mph)
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yards per minute (ypm)
Question 2
Question
The faster the speed of an object:
Answer
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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
Question 3
Question
speed = .... ?
Answer
-
distance * time
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((u+v)/2) * t
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distance / time
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speed / distance
Question 4
Question
Why is average distance used?
Answer
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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
Question 5
Question
How do speed cameras work?
Answer
-
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
Question 6
Question
What is the formula for calculating the speed of a car using speed cameras?
Answer
-
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
Question 7
Question
(Distance-time graphs) The steeper the gradient....
Answer
-
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
Question 8
Question
(distance - time graphs) a straight diagonal line shows...
Answer
-
a steady speed
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acceleration
Question 9
Question
(distance-time graphs) a straight horizontal line (---------) shows.....
Answer
-
No movement (stationary)
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The object is going backwards
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The object is travelling in a straight line
Question 10
Question
(distance-time graphs) a steeper diagonal line means....
Answer
-
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
Question 11
Question
(distance-time graphs) a diagonal line going downwards means....
Answer
-
The object is decellerating
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Object is moving slower
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object is going backwards
Question 12
Question
How do you work out the speed of an object on a distance-time graph?
Answer
-
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
Question 13
Question
the acceleration / deceleration of an object is..... ?
Answer
-
the change in speed per second
-
how fast the object is moving
Question 14
Question
how do you measure acceleration and deceleration?
Answer
-
acceleration = measured in: m/s * m/s (a.k.a. metres per second squared)
-
deceleration = measured in: -m/s * -m/s (a.k.a. - metres per second squared)
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m/s, kph or mph
Question 15
Question
How do you work out the acceleration of a moving object?
Answer
-
change in speed/ time taken for change in speed
-
acceleration = (final velocity - initial velocity) / time
-
s = ((u + v) /2) * t
Question 16
Question
Example question: a car accelerates at 1.5 m/s2 for 12 seconds.
Calculate the change in speed of the car
Answer
-
18 m/s
-
8 m/s
-
8 m/s2
Question 17
Question
(speed-time graphs) a horizontal line means...
Answer
-
No acceleration (0 m/s2)
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Constant acceleration
Question 18
Question
(speed-time graphs) a positive diagonal line shows....
Answer
-
acceleration
-
an increase in speed
Question 19
Question
(speed-time graphs) a negative diagonal line shows..
Answer
-
deceleration
-
going backwards
Question 20
Question
(speed-time graphs) the area underneath the speed-time can be used to measure....
Answer
-
distance travelled
-
total time taken
Question 21
Question
How would you calculate the total distance travelled on a speed-time graph?
Answer
-
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
Question 22
Question
What is Force measured in?
Answer
-
Newtons
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Gravity
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kg
Question 23
Question
Forces can cause objects to....?
Answer
-
accelerate
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decellerate
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to be heavier
Question 24
Question
Weight causes an object to have.... ?
Answer
-
gravity
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force
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more acceleration
Question 25
Question
How does friction affect a car?
Answer
-
causes it to slow down
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causes sparks in the wheels
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makes it go faster
Question 26
Question
What happens when a sky diver opens up a parachute mid-jump?
Answer
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Air resistance
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Friction
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Gravity
Question 27
Question
What happens to a sky-diver mid-jump when air resistance and weight are balanced?
Answer
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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
Question 28
Question
if an unbalanced force acts, the acceleration of an object will depend on: ?
Answer
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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
Question 29
Question
more mass = ... ?
Answer
-
= more acceleration
-
= less acceleration
-
= less kinetic energy
Question 30
Question
What is the formula for the relationship between force, mass and acceleation
resultant force (N) = .... ?
Answer
-
= 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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