Chapter 9 - Force, Mass And Momentum

Question 1

Define:

Mass

Answer 1

The mass (m) of a body is a measure of how difficult it is to accelerate that body.

Question 2

Define:

The Newton

Answer 2

1N is the force that gives a mass of 1kg an acceleration of 1m/s*.

Question 3

Define:

Weight

Answer 3

The weight of an object is the force of the Earth’s gravity acting on it.

Question 4

Define:

Momentum (p)

Answer 4

Mass x Velocity

Question 5

Define:

Newton’s first law of motion

Answer 5

States that every body will remain in a state of rest or travelling with a constant velocity unless an unbalanced external force acts on it.

Question 6

Define:

Newton’s second law of motion

Answer 6

States that when an unbalanced force acts on a body the rate of change of the body’s momentum is directly proportional to the force and takes place in the direction of the force.

Question 7

Define:

Newton’s third law of motion

Answer 7

States that if Body A exerts a force on Body B, Body B exerts an equal but opposite force on body A, i.e. Action equals reaction

Question 8

What is:

The Principle of Conservation of Momentum

Answer 8

States that in any interaction between two or more bodies, the total momentum of the bodies before the interaction is equal to the total momentum after the interaction provided no external forces act on the system of bodies.

Question 9

Define:

Force

Answer 9

Force is anything that causes the velocity of an object to change.