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Forces and Momentum · Paper 2 — Free Physics HL Practice Questions

1MasterySAQ-SForce, mass, and acceleration7 marksPaper 2~11 min

Data

F=maF = ma, cos⁡40°=0.766\cos 40° = 0.766
A box of mass 5.0 kg is pulled along a rough horizontal surface by a force of 25 N applied at 40° above the horizontal. The surface exerts a constant friction force of 8.0 N on the box.
(a)
Explain why the vertical component of the applied force does not contribute to the horizontal acceleration of the box. [2 marks]
(b)
Calculate the horizontal acceleration of the box. [3 marks]
(c)
The angle of the applied force is increased above 40° while the magnitude of the applied force remains 25 N. The friction force remains 8.0 N. Deduce whether the horizontal acceleration of the box increases or decreases. [2 marks]
diagram

Solutions

2MasterySAQ-SForce, mass, and acceleration7 marksPaper 2~11 min
A velocity-time graph for a 3.0 kg object moving in a straight line consists of a straight line from (0,0)(0, 0) to (4,12)(4, 12) and then a horizontal line from (4,12)(4, 12) to (8,12)(8, 12), where velocity is in m s−1\text{m s}^{-1} and time is in s.
(a)
Determine the net force acting on the object during the first 4 seconds. [2 marks]
(b)
Calculate the impulse delivered to the object between t=0t = 0 and t=8t = 8 s. [2 marks]
(c)
The object then decelerates uniformly to rest over a further 6 seconds. Deduce whether the magnitude of the net force during this deceleration phase is greater than, equal to, or less than the net force found in (a). [3 marks]
diagram

Solutions

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