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Edexcel | Physics 4PH0 | W 17 1 | Q4

W 17 1
4
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The diagram shows the horizontal forces on a car travelling to the right along a level road.

W 17 1
4
(a)
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1 Mark

How can you tell that the car is accelerating?

 

   

 (however expressed) driving force>

resistive force;

 

 

there is a resultantforce

forces are not

balanced  

 

 

W 17 1
4
(b) (I)
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1 Mark

State the relationship between acceleration, change in velocity and time.

 

   

 

 

 in words or

accepted symbols

 

W 17 1
4
(b) (II)
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2 Mark s

 The car accelerates for 6.0 s.

   The velocity of the car increases from 15 m/s to 24 m/s.

   Calculate the acceleration of the car.

 

acceleration = ............................................. 

 

 substitution;

evaluation;

 

 e.g.

W 17 1
4
(c)
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2 Mark s

Describe how the horizontal forces on the car change when the driver applies the brakes.

 

   

any two from:

MP1. braking force increases;

 

MP2. the driving / forward force becomes

zero/decreases;

MP3. air resistance decreases (as speed

decreases);

MP4. resultant force is now in opposite

direction; 

 

the overall resistive

force /backwards

force increases

 

 

 

 

 

 

allow

resultant force

increases for 1

mark 

 

 

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