Force, Mass and Momentum

Question 1

Force

Answer 1

Anything that causes the velocity of an object to change is called a force

Question 2

Unit of force

Answer 2

The unit of force is the newton (N)

Question 3

Mass

Answer 3

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

Question 4

Unit of mass

Answer 4

The unit of mass is the kilogram (kg)

Question 5

The newton

Answer 5

1 newton is the force that gives a mass of 1 kg an acceleration of 1 m/s*2

Question 6

Weight

Answer 6

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

Question 7

Unit of momentum

Answer 7

The unit of momentum is the kilogram metre per second (kg m / s)

Question 8

Newton’s first law of motion

Answer 8

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 9

Newton’s second law of motion

Answer 9

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 10

Newtons’ third law of motion

Answer 10

States that if a body A exerts a force on a body B, then body B exerts an equal but opposite force on body A, i.e. action and reaction are equal and opposite

Question 11

The principle of conservation of momentum

Answer 11

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