Mechanics And Further Mechanics

Question 1

Scalar

Answer 1

A quantity that has magnitude but no direction

Question 2

Vector

Answer 2

A quantity with magnitude and direction

Question 3

Displacement

Answer 3

Distance moved in a stated direction (vector)

Question 4

Speed

Answer 4

Distance moved per unit time (scalar)

Question 5

Instantqneous Speed

Answer 5

The speed at an defined moment in time (scalar)

Question 6

Average Speed

Answer 6

The distance travelled by the time taken to travel that distance (scalar)

Question 7

Velocity

Answer 7

A vector determined by the displacement per unit time

Question 8

Acceleration

Answer 8

A vector determined by the rate of change of velocity

Question 9

Newton

Answer 9

One newton= the force that causes 1kg to have an acceleration of 1ms-2

Question 10

Weight

Answer 10

The gravitational force on a body

Question 11

Newtons First Law

Answer 11

Every body continues in its state of rest or constant velocity in a straight line unless acted on by a resultant external force

Question 12

Newtons Second Law

Answer 12

F=ma

Question 13

Newtons Third Law

Answer 13

Every action has an equal and opposite reaction

Question 14

Centre of gravity

Answer 14

The centre of gravity of an object is a point where the entire weight of an object appears to act

Question 15

Density

Answer 15

Mass per unit volume

Question 16

Work Done by a force

Answer 16

The energy or work of a force used in moving through a displacement in the direction of the force

Question 17

The Joule

Answer 17

The work done when a force of 1N moves 1m in the direction of the force

Question 18

Energy (J)

Answer 18

The stored ability to do work

Question 19

Conservation of energy

Answer 19

In a closed system energy may be converted from one form to another but cannot be created or destroyed

Question 20

Gravitational Potential Energy

Answer 20

The energy stored in an object due to its position in the gravitational field

Question 21

Kinetic Energy

Answer 21

The energy stored in an object due to its speed

Question 22

Power

Answer 22

The rate of doing work