Dynamics

Question 1

What is momentum and its unit of measurement?

Answer 1

The product of mass and velocity (M=mxv) measured in kgms-1.

Question 2

What is the principle of conservation of momentum?

Answer 2

The total momentum of a system of interacting bodies will remain constant if there are no external forces acting.

Question 3

What does the gradient represent in a momentum-time graph?

Answer 3

Force.

Question 4

What happens to energy in elastic collisions?

Answer 4

No kinetic energy is lost or gained.

Question 5

What happens to energy in inelastic collisions?

Answer 5

Some kinetic energy is lost to the surroundings.

Question 6

What is Newtons first law?

Answer 6

If the resultant force on an object is zero, the object will either remain stationary, or if already moving, will continue to move with uniform motion.

Question 7

What is Newton’s second law?

Answer 7

The rate of change of momentum is directly proportional to the applied resultant force and occurs in the same direction as the force.

Question 8

What is Newtons third law?

Answer 8

If body A exerts a force on body B, then body B exerts and equal but opposite force on body A.