Our Dynamic Universe 5

Question 1

Speeds and distances are always measured …

Answer 1

Relative to a frame of reference

Question 2

What is a frame of reference

Answer 2

The background against which measurements are made

Question 3

Einsteins theory is based on 2 postulates these are :

Answer 3

• the speed of light does not change no matter the frame e of reference
• the laws of motion are true in all frames of reference

Question 4

What does the special relativity of time dilation state

Answer 4

No 2 observers moving relative to each other will agree on the time taken for an event to happen.

For example locked moving relative to a stationary observer will run slow

Question 5

What the special relativity of length contraction

Answer 5

No 2 observers moving relative to each other will agree on distances and length measured

For example objects moving relative to a stationary observer will appear shorter in length