Dynamics

Question 1

What is mass?

Answer 1

Mass is the property of an object that resists motion

Question 2

What is weight?

Answer 2

Force of gravity acting on an object

Question 3

Newtons 1st Law of motion

Answer 3

Every body is continous in its state of rest or uniform velocity unless acted on by a resultant force

Question 4

Newtons 2nd Law of motion

Answer 4

For a body of constant mass, its acceleration is directly proportional to its resultant force

Question 5

Newtons 3rd Law of motion

Answer 5

Whenever a body exerts a force on another body, the second body will exert an equal but opposite force

Question 6

Define linear momentum

Answer 6

Product of the mass and velocity of an object

Question 7

Define force

Answer 7

It is the rate of change of momentum

Question 8

Inertia

Answer 8

Tendency of a moving object to continue moving

Question 9

Motion of an object in a uniform gravitational field

Answer 9

Initially the air resistance is negligable when the object is experiencing free fall. As velocity increases due to the downward force of the weight, air resistance increases. Resultant force decreases therefore acceleration also decreases. Eventually when air resistance is equal to weight, acceleration=0. Terminal velocity.

Question 10

Principle of conservation of momentum

Answer 10

Provided there is no external forces acting on a system the total momentum remains the same.

Question 11

Perfectly elastic collisions

Answer 11

These are collisions in which the total kinetic energy remains the same before and after the collision. The relative speed of approach=relative speed of seperation