Paper 3 H - SAMPLE SET 1 Q3
3) Figure 4 shows an ice skater standing on the ice.
3.1) Write down the equation that links acceleration, change in velocity and time. [1 mark]
3.2) As the skater pushes away across the ice there is a small frictional force.
After pushing, the skater starts to move with a velocity of 5 m/s.
He slows to 3 m/s in 6 seconds.
Calculate the acceleration of the skater. [2 marks)
3.2) As the skater pushes away across the ice there is a small frictional force.
After pushing, the skater starts to move with a velocity of 5 m/s.
He slows to 3 m/s in 6 seconds.
Calculate the acceleration of the skater. [2 marks)
Acceleration = _______________ m/s2
3.3) Write down the equation that links acceleration, force and mass.
[1 mark]
3.4) Friction reduces the speed of the skater.
Calculate the frictional force acting on the skater to slow him down.
[2 marks]
Frictional force = __________________ N
3.5) The skater stands still on the ice.
He throws his bag to a friend.
As he throws his bag forwards, the skater moves backwards across the ice.
Use the idea of conservation of momentum to explain why he moves backwards.
[4 marks]
(Total for Question 3 = 10 marks)