1.2 Kinematics

Question 1

Mean velocity=

Answer 1

displacement/ time taken

Question 2

On a displacement-time graph:

Answer 2

• gradient is velocity
• curve is acceleration
• an upward gradient means that x is increasing, so there is a positive velocity; if the graph slopes down the direction of motion is reversed

Question 3

On a velocity-time graph:

Answer 3

• gradient is acceleration
• so 0 gradient i.e. horizontal means constant velocity
• area under the graph is displacement, unless the velocity is negative in which case it will be the area under the t-axis and above the graph

Question 4

SUVAT

Answer 4

s/x = displacement
u = initial velocity
v = final velocity
a = acceleration
t = time

Question 5

For SUVAT you must know

Answer 5

how to derive the equations from graphs (see Eduqas pg. 28)

Question 6

SUVAT 1. v=

Answer 6

u + at

Question 7

SUVAT 2. x=

Answer 7

1/2(u + v)t

Question 8

SUVAT 3. x=

Answer 8

ut + 1/2at^2

Question 9

SUVAT 4. v^2=

Answer 9

u^2 + 2ax

Question 10

SUVAT 5. x=

Answer 10

vt - 1/2at^2

Question 11

If assuming there are no other forces acting; the object is in free fall

Answer 11

acceleration will be g (= 10 or 9.81)

Question 12

We can treat the horizontal and vertical motions of a projectile

Answer 12

independently

Question 13

PRACTICAL: Measurement of g by free fall

Answer 13

• Measure time it takes to fall from a known height

- Steel sphere/ electromagnet/ aluminium hinged flap/ electronic timer