Practice IB Physics Topic A.3 Work, Energy and Power with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for A.3 Work, Energy and Power and mirrors Paper 1A, 1B, 2 style where relevant.
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A spring with spring constant is compressed by and used to launch a cart along a horizontal surface. By the time the cart loses contact with the spring, of the spring's initial elastic potential energy has been dissipated by friction. What is the speed of the cart immediately after it loses contact with the spring?
A machine lifts a load vertically upward at a constant speed of . The gravitational field strength is .
(a) the power output required to lift the load at this constant speed.
(c) why the load does not gain kinetic energy even though the machine is doing work.
A block of mass slides down a rough incline of length and angle . The coefficient of dynamic friction is . The block starts from rest and reaches the bottom with speed . What is the correct expression for the energy dissipated by friction?
The energy consumption of a device is shown by the Sankey diagram below:
What is the efficiency of this device?
A object is attached to a spring () and compressed on a frictionless horizontal surface. It is then released. After leaving the spring it slides onto a rough patch of length , where it travels the full before coming to rest. What is the average resistive force exerted by the rough patch?
(b) the work done by the machine in .
