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Flashcards in Definitions Deck (18):
1

Scalar

A quantity with magnitude only.

2

Vector

A quantity with magnitude and direction.

3

Contact force

A force exerted when objects are physically touching.

4

Non contact force

A force exerted when objects are physically separated.

5

Centre of mass

A point where the weight of an object may be considered to act. Usually in the middle of the object.

6

Work done

The energy Transferred by a force.

7

Extension

How much an object has increased in length.

8

Moment

The turning Effect of the force

9

Distance

How far an object moves

10

Displacement

Distance and direction from the start point to the finish point, in a straight line.

11

Speed

How far an object moves per second
Eg 5m per second

12

Velocity

Speed in a specific direction

13

Acceleration

The rate of change of velocity

14

Acceleration due to gravity

9.8 m/s2

15

Terminal velocity

The velocity when the resultant force equals 0.
Eg when the air resistance is equal to the gravitational acceleration. Both act against each other and the resultant force is zero.

16

Newton’s first law

If the resultant force is zero, then an object will continue to move at the same velocity.

17

Newton’s second law

The acceleration of an object is proportional to the resultant

18

Newton’s third law

When two objects interact, the forces that they exert on each other are equal and opposite.