15128989
Descripción
Test por Jeffrey Piggott, actualizado hace más de 1 año
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Creado por Jeffrey Piggott
hace alrededor de 6 años
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Pregunta 1
Pregunta
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.
Respuesta
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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.
Pregunta 2
Pregunta
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.
Respuesta
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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.
Pregunta 3
Pregunta
For the two physical quantities, impulse and force, which one of the following is correct?
Respuesta
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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.
Pregunta 4
Pregunta
The rate of change of momentum of a body falling freely under gravity is equal to its ..........
Respuesta
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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.
Pregunta 5
Pregunta
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?
Respuesta
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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.
Pregunta 6
Pregunta
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 ......
Respuesta
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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.
Pregunta 7
Pregunta
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)
Respuesta
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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
Pregunta 8
Pregunta
Which one of the following statements is correct?
The force acting on an object is equivalent to .......
Respuesta
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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.
Pregunta 9
Pregunta
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)
Respuesta
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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
Pregunta 10
Pregunta
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)
Respuesta
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A
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B
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C
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D
Pregunta 11
Pregunta
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)
Respuesta
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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
Pregunta 12
Pregunta
Which of the following is a possible unit for rate of change of momentum?
Respuesta
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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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