The document contains questions about graphs, examples of friction, definitions of weight and mass, and physics problems involving force, mass, and acceleration. It asks the reader to define terms, provide examples, calculate values, and explain concepts related to graphs, friction, weight, mass, force, and motion.

1. 1Describe the graphs that follow. [9]
distance speed
speed
time time time
speed distance distance speed
time time time time
2 (a)Give two examples in which friction is a nuisance
(b)Give two examples in which friction is of help[2,2]
3 (a) What is weight?
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(b) Is your weight the same everywhere, i.e. on different planets? Explain your answer. [2]
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c) What is the mass of a of an object that weighs 200N on Earth (on Earth g= 10 N/kg)
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(d) What is the mass of a of an object that weighs 200N on Mercury (on Mercury g= 3.7 N/kg) [2]
[4 On Earth the weight of a man of mass 90kg is 900N. On Mars his mass is still 90kg but his
weight is 342N. (a) Explain why his weight is not the same on Mars as it is on Earth
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(c) Calculate the gravitational field strength on Mars.
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5 1 A mass of 8 kg accelerates at a 5 m/s2
. What force is acting upon it?
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2 (a) What is the acceleration of a mass of 24 kg when a force of 6 N acts upon it?
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4 A small trolley of mass 2.5kg is accelerated from rest by a force of 20 N. The force acts
continuously for 4 seconds.
(a) Calculate the acceleration of the trolley.
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(b) What velocity will the trolley reach after 4 seconds?
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