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.
This is an open system.
This is a closed system.
Friction is an external force on this system.
There is no net external force on this system.
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.
For the two physical quantities, impulse and force, which one of the following is correct?
A Impulse is a scalar and force is a scalar.
B Impulse is a scalar and force is a vector.
C Impulse is a vector and force is a scalar.
D impulse is a vector and force is a vector.
The rate of change of momentum of a body falling freely under gravity is equal to its ..........
A weight.
B power.
C kinetic energy.
D potential energy.
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?
A zero.
B 12.5 N s.
C 25 N s.
D 50 N s.
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 ......
A 2mv to the right.
B 2mv to the left.
C mv to the left.
D zero.
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?
A 200 m.s^–1
B 400 m.s^–1
C 800 m.s^–1
D 1600 m.s^–1
Which one of the following statements is correct?
The force acting on an object is equivalent to .......
A its change of momentum.
B the impulse it receives per second.
C the energy it gains per second.
D its acceleration per metre.
The graph shows the variation with time, t, of the force, F, acting on a body.
What physical quantity does the area X represent?
A the displacement of the body
B the acceleration of the body
C the change in momentum of the body
D the change in kinetic energy of the body
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.
A
B
C
D
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?
A 2.5 m.s^–1
B 10 m.s^-1
C 50 m.s^-1
D 100 m.s^-1
Which of the following is a possible unit for rate of change of momentum?
A N.s
B N.s^-1
C kg.m.s^-1
D kg.m.s^-2
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