Forces – An Introduction 1
When a plane is in flight, the engines provide a thrust force that pushes the aircraft forwards. The wings provide a ‘lift’ force that acts upwards. a) Name two other forces that act on the plane. In each case state whether it is contact force or non-contact force.
[4] b) The plane has a mass of 120 000kg. Calculate the weight of the plane (g = 10N/kg). Weight =
N
[2]
c) The plane accelerates and ascends to a higher altitude. During this time, the resultant forwards force is twice the size of the resultant upwards force. Use this information to draw a scale vector diagram. Your diagram should show: • The resultant forwards force. • The resultant upwards force. • A final resultant force that shows the combined effect of all the forces acting on the plane. 2
[3]
A student carries out an investigation into forces. They use an air track, which suspends a glider vehicle on a cushion of air so that it can move smoothly without touching the ground. a) What force is the air track designed to reduce? Answer:
[1]
b) Use the idea of contact and non-contact forces to explain why the air track is effective at doing this.
[2] Total Marks
334
/ 12
GCSE Combined Science Workbook
227841 AQA Higher Tier Combined Science All-in-One_P334_356.indd 334
6/29/16 12:27 PM