Physics : 12 Questions About Speed, Velocity, and Acceleration

Hi,

Hereby, I uploaded a number of physics questions about speed, velocity, and acceleration.

If you want some explanation about a certain number, please don't be hesitate to write it in a comment section. I'll explain it to you in the easiest way that I can. :)


Cheers,

Dee

1.  An athlete ran a distance of 100 meters in 9.82 seconds. What was his 

     average speed?

2.  A car travels 5 km due east and makes a U-turn back to travel a further 

    distance of 3 km. Given that the time taken for the car to move from the 

    starting point to the ending point is 12 minutes, find : 

      a).  The average speed of the car !

      b).  The average velocity of the car !

3.  A bus starts from rest and achieves a velocity of 20 m/s in 10 s while moving 

     eastwards from a starting point. Calculate its acceleration !

4.  A sports car travelling westwards at 108 km/h suddenly comes to a halt in 5 s. 

     Find its acceleration.

5.  A bullet train starts from rest from a station and travels along a straight 

    horizontal track towards another station. The graph below shows how the 

    speed of the train varies with time over the whole journey. Determine the total 

    distance travelled by the train.

6.  The velocity-time graph of a car is shown below.

     Describe the car's motion during the following periods of time :

        

      a).   0 - 5 s

      b).  5 - 10 s

      c). 10 - 15 s 

      d). 15 - 20 s

      e). 20 - 25 s

      f).  25 - 30 s

      g). 30 - 35 s

7.  The graph below shows how the velocity of a ball changed when it was rolled 

     up a smooth slope with an initial speed of 8 m/s.

      a). At what time did the ball reach its highest point on the slope?

      b). Calculate the greatest distance of the ball from its starting point.

      c). Calculate the acceleration of the ball as it moved up the slope.

      d). At what time would the ball return to its starting point?

8.  An experiment was carried out in order to measure the density of air, using 
     a thick-walled bottle fitted with a tap, as shown in the diagram below.

     The following results were obtained. 

     The mass of the bottle containing air was 410 g.

     The mass of the evacuated bottle was 409 g.
     The mass of the bottle filled with water was 1150 g.
     The density of water is 1 g/cm³.

      a). What mass of water was needed to fill the bottle?

      b). What is the volume of the bottle?

      c). What mass of air filled the bottle?

      d). What was the density of the air?


9.  A car of mass 1000 kg accelerates from rest to 20 m/s in a time of 5 s.
    Calculate the forward thrust of the car.


10. The frictional force between a box of mass 4 kg and the floor is 15 N.
       It is pushed across the floor with a constant force such that it 
       accelerates at 0.8 m/s².

          a). What is the force applied to the box?


          b). If this same force is applied to the box which is now placed
               on a frictionless floor, what is the acceleration produced?



11. David and his father sat at the ends of a see-saw, 2 m from the pivot. 
      Where should David's mother sit in order to balance the see-saw?

12. Give the definitions and SI units of the following words.

          a). Speed

          b). Acceleration

          c). Period of a Pendulum

          d). Energy

          e). Work Done

          f ). Efficiency

          g). Power

          h). Velocity

          i ). Moment of Force

          j ). Force