Laws of Motion and Momentum

Question 1

What is Newtons First Law of motion

Answer 1

An object will remain at rest or continue to move at constant velocity unless acted upon by a resultant force.

Question 2

What is Newtons Third Law of Motion

Answer 2

When two objects react, they exert equal and opposit forces on each other.

Question 3

What is newtons second law of motion

Answer 3

The net force acting on an object is directly proportional to its rate of change of momentum and is acting in the same direction. An equation of this law can be written as Force = Change in momentum / Change in time

Question 4

What is momentum

Answer 4

Mass * Velocity

Question 5

What is the principle of conservation of momentum

Answer 5

For a system of interacting objects, the total momentum in a specified direction remains constant, as long as no external forces act on the system.

Question 6

How to investigate momentum

Answer 6

Using a digital scale, find the mass of both objects. Place objects at each end of a linear air track. Use light gates and digital timer to find velocity.

Question 7

What is a perfectly elastic collision

Answer 7

A collision where momentum, total energy and kinetic energy are conserved

Question 8

What is an inelastic collision

Answer 8

A collision where momentum and total energy is conserved but kinetic energy is not.

Question 9

What is impulse

Answer 9

The measure of change in momentum. Force * change in time = impulse. Mass * (v - u) = Impulse. Impulse = Change in momentum

Question 10

What are the characteristics of a force - time graph

Answer 10

The area under a force - time graph is the impulse