Topic 5 Forces Flashcards Preview

Physics > Topic 5 Forces > Flashcards

Flashcards in Topic 5 Forces Deck (25):
1

Vectors quantities

Have magnitude and direction. Eg force, velocity, displacement, acceleration and momentum

2

Scalar quantities

Only have magnitude and no direction. Eg speed, distance, mass, temperature and time

3

Contact force

Two objects have to touch for a force to act. Eg friction, air resistance, tension of ropes, normal contact force

4

Non-contact force

When the objects don’t need to be touching to act. Eg magnetic force, gravitational force and electrostatic force

5

Newton’s third law

When two objects interact the force exerted is equal and opposite on the two objects

6

Gravitational force

The force of attraction between masses. It makes all things fall to the ground. And gives everything weight

7

Mass

The amount of stuff in an object. Not a force. Measured in kilograms

8

Weight

The force acting on an object due to gravity. Weight is higher for objects that have higher masses. It is a force that is measured in Newton’s

9

The relationship of mass and weight

They are directly proportional

10

Free body diagrams

It describes the forces acting on an object the sizes of the arrows show the relative magnitude of the forces and the directions they are going

11

Resultant force

The overall force on a point or object. So the result of two forces pushing against each other

12

Word done to an object

When a force moves an object through a distance energy is transferred and work is done on the object

13

Scale drawing

They find resultant forces.

14

Equilibrium

When forces are balanced

15

Stretching, compressing and bending

When more than one force acts on an object.

16

Elastically deformed

When a force is applied to something and it returns to its original shape and length

17

Inelastically deformed

When a force is exerted on an object causing it stay in a certain position and length

18

What is the relationship between extension to force

They are directly proportional

19

What happens if you continue to extend the spring

Eventually extension will increase but force will not and it has reached maximum force

20

Moment

The turning effect of a force. The longer the distance from the pivot and the more energy exerted means a higher moment

21

Levers

Make it easier to do work. Since moment = force x distance if the moment stays the same and the distance increases the force must decrease

22

Gears

Gears interlock and turn in the opposite direction. Transmit the rotational effect of the force. Different sized gears change the moment so larger gear will cause a bigger moment. Larger gears will turn slower

23

Pressure

The force per unit area. The particles move around exert a force on the object

24

Pressure in liquids

Depends on depth and density. The more dense a liquid is the more particles it has so will collide and have a higher pressure. As the depth increases the number of particles above increases so the pressure increases

25

Upthrust of objects in fluid

High