Yr 9 End of Year Revision Flashcards Preview

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Flashcards in Yr 9 End of Year Revision Deck (21):
1

What are the topics coming in Yr 9 Physics?

Forces&their effects,the particle model and heating, waves, light and the electromagnetic spectrum, static electricity and magnetism.

2

What is a force?

A push or a pull on an object that is caused by interacting with something.

3

What is a free body diagram?

An object/system on its own and all the forces acting on it.

4

What is a resultant force?

The overall force on a point or object.

5

What was newton's first law?

The law of inertia (an object at rest will remain at rest unless acted on by an external force).

6

What is the net force?

The "Hypotenuse"

7

When is an object in equilibrium?

When the forces are balanced.

8

What are moments?

A moment is the turning effect of a force.

9

What is the equation for moments?

Moment (Nm) = force (N) x distance (M)

10

How do you get the maximum moment?

Push at right - angles

11

What is the principle of moments

the sum of clockwise moments = the sum of anticlockwise moments

12

What is the formula for resultant FORCE?

F = m x a (Force = Mass x Acceleration)
Resultant force (N) = Mass (Kg) x Acceleration (m/s2)

13

Why are large deccelerations dangerous?

Because they require a large force to deccelarate quickly. Slowing the object down over a longer period of time would help, seat belts stretch slightly and air bags slow you down gradually.

14

Why are large deccelerations dangerous?

They might cause the brakes to overheat and cause the viecle to skid.

15

What is mass?

The amount of "stuff" in an object. This will be the same value anywhere in the universe.

16

What is mass measured in?

Kilograms (KG)

17

What is weight?

The force acting on an object due to gravity. Caused by the gravitational field around Earth.

18

What is weight measured in?

Newtons. It acts on the centre of mass. It is measured using a newton meter.

19

What is the formula for weight?

Weight (N) = mass (kg) x gravitational field strength (N/kg)

20

What is velocity?

Velocity is both speed and direction of an object.

21

What is centripetal force?

The force that keeps something moving in a circle.