Forces and Motion - Movement and Position

Question 1

plot and explain distance-time graphs

Answer 1

A distance-time graph has distance on the y-axis (usually in metres) and time on the x-axis (usually in seconds). The gradient of the line (change in y/ change in x) is the speed. If the line is flat then the object is stationary.

Question 2

what is the relationship between average speed, distance moved and time taken?

Answer 2

average speed = distance/time

Question 3

how do you investigate the motion of everyday objects?

Answer 3

1. mark the start and end positions for the known distance and use a metre rule to measure the distance
2. line up the front of the car with the start point, make sure the car starts from stationary, release and start timer on the stopwatch
3. stop the timer when the front of the car passes the endpoint
4. improve by repeating and averaging

Question 4

what is the relationship between acceleration, change in velocity and time taken?

Answer 4

acceleration = change in velocity/time taken

Question 5

plot and explain velocity-time graphs

Answer 5

on a velocity-time graph, the velocity is on the y-axis (usually in m/s) and time is on the x-axis (usually in s). If the line is flat then the object is moving at a constant velocity.

Question 6

how do you determine acceleration from a velocity-time graph?

Answer 6

the gradient of the line is the acceleration

Question 7

how do you determine the distance travelled from a velocity-time graph?

Answer 7

The area under the line is the distance travelled.

Question 8

what is the relationship between final speed, initial speed, acceleration and distance moved?

Answer 8

final speed^2 = initial speed^2 + (2 × acceleration × distance moved)