physics p4 p5 p6

1. gradient = speed

2. flat sections where its stopped

3. steeper the graph, faster its going.

4. downhill sections - coming back to starting point.

5. curves represent acceleration

6. steepening curve - speeding up

7. leveling off curve - slowing down

1. gradient = acceleration

2. flat sections - steady speed

3. steeper the graph greater acceleration/deceleration

4. uphill - acceleration

5. downhill - deceleration

6. area under any section = to distance travelled in that time interval

7. curve - changing acceleration

a) friction between solid surfaces which are gripping

b) friction between solid surfaces which are sliding past each other

c) resistance of "drag" from fluids - moving object has to force through particles

• energy stored in an object when you raise it to a height against the force of gravity,
• change in g.p.e = weight (N) x change in height (m)
• when something falls g.p.e is converted into k.e the further is falls the faster is goes.
• kinetic energy gained = potential energy lost

when two insulating objects are rubbed together, electrons are scraped off one and dumped onto the other.

this leaves a positive charge on one and a negative charge on the other.

which way electrons are transferred depends on the materials

electrically charger objects attract small objects placed near them

note: only electrons move never the positive charges

liked charges repel - opposite charges attract