15128989
Descrição
Quiz por Jeffrey Piggott, atualizado more than 1 year ago
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Criado por Jeffrey Piggott
aproximadamente 6 anos atrás
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Questão 1
Questão
A system is composed of two blocks. The blocks, sliding on a horizontal frictionless surface, collide and stick together. Which of the following statements are correct regarding the system? There are two correct answers.
Responda
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This is an open system.
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This is a closed system.
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Friction is an external force on this system.
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There is no net external force on this system.
Questão 2
Questão
A system is composed of two blocks. The blocks, sliding on a horizontal frictionless surface, collide and bounce apart.
Which of the following statements are correct regarding the system? There are two correct answers.
Responda
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This is an open system.
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This is a closed system.
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Friction is an external force on this system.
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There is no net external force on this system.
Questão 3
Questão
For the two physical quantities, impulse and force, which one of the following is correct?
Responda
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A Impulse is a scalar and force is a scalar.
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B Impulse is a scalar and force is a vector.
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C Impulse is a vector and force is a scalar.
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D impulse is a vector and force is a vector.
Questão 4
Questão
The rate of change of momentum of a body falling freely under gravity is equal to its ..........
Responda
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A weight.
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B power.
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C kinetic energy.
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D potential energy.
Questão 5
Questão
A force, F, varies with time, t, as shown by the graph and is applied to a body initially at rest on a smooth surface.
What is the momentum of the body after 5.0 s?
Responda
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A zero.
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B 12.5 N s.
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C 25 N s.
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D 50 N s.
Questão 6
Questão
A particle of mass m strikes a rigid wall perpendicularly from the left with velocity v.
If the collision is perfectly elastic, the change in momentum of the particle which occurs as a result of the collision is ......
Responda
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A 2mv to the right.
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B 2mv to the left.
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C mv to the left.
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D zero.
Questão 7
Questão
The graph shows how the force acting on a body changes with time.
The body has a mass of 0.25 kg and is initially at rest. What is the speed of the body after 40 s assuming no other forces are acting?
Image:
Q7 (binary/octet-stream)
Responda
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A 200 m.s^–1
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B 400 m.s^–1
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C 800 m.s^–1
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D 1600 m.s^–1
Questão 8
Questão
Which one of the following statements is correct?
The force acting on an object is equivalent to .......
Responda
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A its change of momentum.
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B the impulse it receives per second.
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C the energy it gains per second.
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D its acceleration per metre.
Questão 9
Questão
The graph shows the variation with time, t, of the force, F, acting on a body.
What physical quantity does the area X represent?
Image:
Q9 (binary/octet-stream)
Responda
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A the displacement of the body
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B the acceleration of the body
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C the change in momentum of the body
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D the change in kinetic energy of the body
Questão 10
Questão
A rail truck X travels along a level track and collides with a stationary truck Y. The two trucks move together at the same velocity after the collision.
Which line, A to D, in the table states how the total momentum and the total kinetic energy of the trucks change as a result of the impact.
Image:
Q11 (binary/octet-stream)
Responda
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A
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B
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C
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D
Questão 11
Questão
The graph shows how the force on a glider of mass 2000 kg changes with time as it is launched from a level track using a catapult.
Assuming the glider starts at rest what is its velocity after 40 s?
Image:
Q12 (binary/octet-stream)
Responda
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A 2.5 m.s^–1
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B 10 m.s^-1
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C 50 m.s^-1
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D 100 m.s^-1
Questão 12
Questão
Which of the following is a possible unit for rate of change of momentum?
Responda
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A N.s
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B N.s^-1
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C kg.m.s^-1
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D kg.m.s^-2
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