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Flashcards in Physics-force And Motion Deck (20)
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1

True or false

Can more than one force act on an object

True

2

When forces of an object are balance the object must be

Stationary or travelling at a steady speed

3

Wh do people reach terminal velocity

The faster the person if falling he greater the air resistance

4

What is a useful way to represent the motion of an object

A distance-time graph

5

Forces can cause objects to turn on a pivot what is this called

Moments

6

If the moment is balanced what must be equal

The anti-clockwise moment and the clockwise moment

7

What is the equation for a moment

Moment = force (N) x distance (m or cm)

8

What is the equation for speed

Speed= distance/time

9

When do elastic materials change shape

When a force is exerted on them

10

When does compression happen

Compression happens when a material or object is squashed

11

When an elastic material changes shape by being stretched or squashed what is is called

Deformation

12

True or false

The greater amount of force exerted the less amount of deformation

False

The greater the force exerted the greater the amount of deformation

13

Hookes law says that the extension of an elastic object is directly proportional to tho the force applied, so if the force applied is doubled then does the extension double

Yes

14

What is the word equation for pressure

Pressure = force/area

15

Why do sink into snow when you walk in it

Your shoes are too small a surface area to spread uo your weight so you sink into the snow because the pressure on the snow is too high

16

What angle to liquids exert pressure on surfaces

90degrees

17

What does the atmosphere exert reassure on

The atmosphere exerts pressure on you and everything around you

18

How does atmospheric pressure changes with altitude, so what happens when you go higher

The weight of air above you is lower
There is lower atmospheric pressure

19

The pressure in liquids changes with dept, so the deeper you go what happens

The greater the weight of liquid above
The greater the liquid pressure

20

Why does an object float

If the object has a lower density than at of the surrounding liquid or gas it will float