For the two physical quantities, impulse and force, which one of the following is correct?
Answer
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.
Question 2
Question
The rate of change of momentum of a body falling freely under gravity is equal to its
Answer
A weight.
B power.
C kinetic energy.
D potential energy.
Question 3
Question
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 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 ......
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?
Which one of the following statements is correct?
The force acting on an object is equivalent to .........
Answer
A its change of momentum.
B the impulse it receives per second.
C the energy it gains per second.
D its acceleration per metre.
Question 7
Question
The graph shows how the resultant force applied to an object of mass 2.0 kg, initially at rest, varies with time.
What is the speed of the object after 1.0 s?
The graph shows how the resultant force applied to an object of mass 2.0 kg, initially at rest, varies with time.
What is the speed of the object after 1.0 s?
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.
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?