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Forces and Momentum · Paper 2 — Free Physics SL Practice Questions
1ChallengeSAQ-LNewton’s laws of motion6 marksPaper 2~9 min
A rocket-powered sled is used to test the effects of high acceleration on humans. The sled has a total mass of 620 kg, including the test subject. The rocket engine provides a constant forward thrust of 8400 N. A constant resistive force of 1200 N acts on the sled throughout its motion.
(a)
State the net force acting on the sled while the engine is firing. [1 mark]
(b)
Determine the acceleration of the sled while the engine is firing. [2 marks]
(c)
The engine fires for 4.0 s from rest and then suddenly fails, so that the thrust drops to zero. The resistive force remains constant at 1200 N. Determine the distance the sled travels from the moment the engine fails until the sled comes to rest. [2 marks]
(d)
The rocket engine operates by expelling exhaust gases backwards at high speed. Explain, using Newton's third law of motion, how the expelled gases produce a forward thrust on the sled. [1]
(e) Evaluate whether the same engine could accelerate the sled if it were operating in the vacuum of space, where the resistive force is zero. [1 mark]
Solutions
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