physics review

what are the speeds of the dots in these models ?

• 1 not moving

  2 constant

  3 decreasing

• 1 constant

  2 increasing

  3 decreasing

• 1 increasing

  2 constant

  3 decreasing

• constant speed

• increasing speed

• decreasing speed

• no speed

What is the resultant force?

• 10 N

• 30 N

• 20 N

• 40 N

Displacement is calculated as

A position-time graph of an athlete winning the 100-m run is shown. Estimate the time taken by the athlete to reach 65 m.

• 6.0 s

• 6.5 s

• 5.5 s

• 7.0 s

from 3rd second to 5th second, the object is

• moving at a constant speed

• speeding up

• not moving

• slowing down

What does this graph represent?

• Constant speed
• Acceleration
• Not moving

How long did it take this object to travel and return back to its reference/starting point?

• 20 s

• 30 s

• 60 s

• 100 s

The speed of the object is changing during interval:

• A-B
• B-C
• C-D
• D-E

_{Which line represents the slower speed?}

• green

• red