1 Forces and Motion: Movement and Position

Question 1

1.3 plot and explain distance−time graphs

Answer 1

Horizontal straight line; gradient zero; speed zero

Sloping straight line; gradient constant; speed constant

Curved line; gradient increase then decrease; speed increase then decrease

Question 2

1.4 know and use the relationship between average speed, distance moved and time taken:

Answer 2

average speed = distance / moved time taken

v = s/t

Question 3

1.6 know and use the relationship between acceleration, change in velocity and time taken:

Answer 3

acceleration = change in velocity / time taken
a = (v − u) / t

Question 4

1.7 plot and explain velocity-time graphs

Answer 4

Horizontal straight line; gradient zero; acceleration zero

Sloping straight line; gradient constant; acceleration constant

Curved line; gradient increase then decrease; acceleration increase then decrease

Question 5

1.8 determine acceleration from the gradient of a velocity−time graph

Answer 5

acceleration = gradient = rise / run ; change in y coordinate / change in x coordinate

Question 6

1.9 determine the distance travelled from the area between a velocity−time graph and the time axis

Answer 6

Straight line; V x T

Sloping straight line and curved line: V x T x 1/2

Question 7

1.10 use the relationship between final speed, initial speed, acceleration and distance moved:

Answer 7

(final speed)[2] = (initial speed)[2] + (2 × acceleration × distance moved) v[2] =u[2] +(2×a×s)

[] = squared