Physics TOPIC 5 definitions P2

Question 1

stretching, compressing or bending objects…

Answer 1

transfers energy

Question 1

you need more than one force acting on an object to…

Answer 1

stetch, compress or bend it

Question 2

spring constant depends on…

Answer 2

the material being stretched, a stiffer spring has a greater spring constant.

Question 3

In an elastic deformation of a spring…

Answer 3

the work done on the spring and the elastic potential energy stored are equal.

Question 4

Typical transport values

Answer 4

car = 20 m/s
train = 30 m/s
plane = 250 m/s

Question 5

In linear relationships, work done by stretching or compressing a spring can be found by using…

Answer 5

Ee = 1/2 Ke²
J = N/m x m

Question 6

How to measure constant speed of an object (or average speed if speed isn’t constant)

Answer 6

• Time how long it takes to cover certain distance using ruler and stopwatch
• calculate speed using S = VT

Question 7

S= VT?

Answer 7

Distance = speed x time
M = m/s x s

Question 8

Distance time graphs
What does gradient represent?

Answer 8

Speed

Question 9

Distance time graphs
how to measure speed at constant velocity?

Answer 9

Distance / time

Question 10

Distance time graphs
what does flat line mean?

Answer 10

stationary

Question 11

Distance time graphs
what does curving line mean?

Answer 11

Changing of speed
either accelerating or decelerating

Question 12

Distance time graphs
How to work out speed on a curve?

Answer 12

1 - draw a tangent
2 pick two points on the tangent and use equation
change in distance / change in time

Question 13

typical car stopping distances

Answer 13

• 23m at 30mph
• 53m at 50mph
• 96m at 70mph

Question 14

typical reaction times

Answer 14

between 0.2s - 0.9s