Kinematics

Question 1

what is displacement?

Answer 1

• the sortest route between two points
• distance and direction
• vector quantity

Question 2

what is a position?

Answer 2

a location relative to a fixed point

Question 3

what is distance?

Answer 3

• a scalar quantity
• no direction

Question 4

what is speed?

Answer 4

• the distance travlled over a period of time
• scalar

Question 5

what is velocity?

Answer 5

• total displacment travlled over a period of time
• vector quantity

Question 6

what do distnace time graphs show us?

Answer 6

• speed as gradient
• stationary points

doesnt show direction

Question 7

what do displacment time graphs show?

Answer 7

• stationary periods
• gradient = velocity
• line curving up= velocity increasing, accelerating

Question 8

what must you take into consideration when caluclating displacment or velocity?

Answer 8

• veloicty is a vector so the direction (positive negative) must be used with the displacemnt when calculating

Question 9

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Question 10

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Question 11

what are some general mistakes?

Answer 11

• units: always highlight the units in the question, especially on the graph
• direction: make sure you label the positive and negative direction, and use these carefully in calculation

Question 12

what can you find from a speed time graph?

Answer 12

• area beneath the graph is the distance travelled
• gradient =

Question 13

Answer 13

Question 14

Describe the journey of the three different cars

Answer 14

Question 15

what does the area under a velocity time graph imply?

Answer 15

• if area is completly positive/negative then it is distance
• if area is a combination of positive and negative area then it is displacement

Question 16

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Question 17

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Question 18

Fill out the table

Answer 18

Question 19

What are the five SUVAT equations and under what assumption are they used-?

Answer 19

Assumption: Acceleration is constant

Question 20

Derive the SUVAT equations

Answer 20

Question 21

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Question 22

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Question 23

What is the downwards acceleration of gravity, according to this exam board ?

Answer 23

9.8

Question 24

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Question 25

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Question 26

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Question 27

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Question 28

Fill in the blanks

Answer 28

Question 29

A lorry of length 16m is travelling at constant speed of 12ms in the insidie lane of a stright road. A car of length 4m is initially travelling in the outside lane in the same direction as the lorry at the same speed. The gap between the two vehicles is 50m. The car accelrates at 2ms for 5 seconds, then travels at a constant speed for 5 seconds. Now the car is travelling at the same speed as before but in front of the lorry and the gap is the same as it was before. How long did the car take to get form its initial to its final position, and how far did the car travel in this time?

Answer 29