1
1 The weight of a skydiver is 750 N.
The weight of the skydiver acts downwards, as shown in the diagram.
While the skydiver is falling, another force acts upwards.
The upward force varies as the skydiver falls.
.............................................
weight = 750 N
(not to scale)
The skydiver is accelerating between time = 0 and time = 20 s of the fall.
Between time = 20 s and time = 40 s the skydiver is falling at a constant speed.
(a) On the diagram, write the name of the upward force on the dotted line above the upward force.
[1]
(b) Suggest a value for the upward force on the skydiver at time = 10 s.
.................................................... N [1]
(c) Determine the value of the upward force on the skydiver at time = 30 s.
.................................................... N [1]
[Total: 3]
2 The diagram shows an aeroplane flying. There are horizontal forces acting on the aeroplane, as
shown in the diagram.
12 000 N 8000 N
(not to scale)
, 2
(a) Calculate the resultant horizontal force on the aeroplane.
resultant force = .............................................. N
direction of resultant force .............................................. [3]
(b) At a later time in the flight, the resultant horizontal force on the aeroplane is zero.
Describe the horizontal motion of the aeroplane.
........................................................................................................................................... [1]
[Total: 4]
3 The limit of proportionality for a spring is at a force of 175 N.
Sketch the extension–load graph for the spring. The sketch must continue beyond a force of 175 N.
extension
0
0 175 load / N
[2]
[Total: 2]
4 A student suspends a spring from a clamp stand and measures the length l0 of the spring.
The diagram shows the apparatus.
1 The weight of a skydiver is 750 N.
The weight of the skydiver acts downwards, as shown in the diagram.
While the skydiver is falling, another force acts upwards.
The upward force varies as the skydiver falls.
.............................................
weight = 750 N
(not to scale)
The skydiver is accelerating between time = 0 and time = 20 s of the fall.
Between time = 20 s and time = 40 s the skydiver is falling at a constant speed.
(a) On the diagram, write the name of the upward force on the dotted line above the upward force.
[1]
(b) Suggest a value for the upward force on the skydiver at time = 10 s.
.................................................... N [1]
(c) Determine the value of the upward force on the skydiver at time = 30 s.
.................................................... N [1]
[Total: 3]
2 The diagram shows an aeroplane flying. There are horizontal forces acting on the aeroplane, as
shown in the diagram.
12 000 N 8000 N
(not to scale)
, 2
(a) Calculate the resultant horizontal force on the aeroplane.
resultant force = .............................................. N
direction of resultant force .............................................. [3]
(b) At a later time in the flight, the resultant horizontal force on the aeroplane is zero.
Describe the horizontal motion of the aeroplane.
........................................................................................................................................... [1]
[Total: 4]
3 The limit of proportionality for a spring is at a force of 175 N.
Sketch the extension–load graph for the spring. The sketch must continue beyond a force of 175 N.
extension
0
0 175 load / N
[2]
[Total: 2]
4 A student suspends a spring from a clamp stand and measures the length l0 of the spring.
The diagram shows the apparatus.
