Edexcel IGCSE Physics 1.7 Velocity-time graphs
Practise drawing and interpreting velocity-time graphs for constant velocity, braking, changing acceleration and linked motion graphs.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- explain constant acceleration by linking a straight velocity-time line to constant gradient
- sketch or complete velocity-time graphs with correct slopes, starts and horizontal sections
- interpret curved graph sections by linking changing gradient to changing acceleration
1.7 Velocity-time graphs question 1
A student does an experiment to determine the acceleration due to gravity, g.
The diagram shows the apparatus used.
This is the student's method.
- connect both light gates to a data logger
- drop a steel ball from rest at the top of the transparent tube
- record the speed of the ball at each light gate
- record the time taken for the ball to fall from light gate A to light gate B
The student changes the distance between the light gates by varying the position of light gate B.
The student measures the time taken for the steel ball to fall from light gate A to light gate B when the light gates are different distances apart.
The table shows the student's results.
Explain how the graph shows that the steel ball is accelerating as it falls.
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