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