Untitled Quiz

1.       Which term refers to an object with constant change in velocity along a straight line in each time interval?

                                                             

                                   

• A. Acceleration   

• B. Uniformly Accelerated Motion 

• C. Universal Motion 

•   D. Velocity

2.       How would you describe the acceleration of a jackstone ball rolling horizontally in a constant velocity?

                                                                              

• increasing 

• decreasing  

• 9.8m/s 

• zero

For question numbers 3-4, use the problem below:

A volleyball is hit at an angle of 30˚ and it reaches a distance of 50 m.

3.     At what point in its trajectory does this projectile have the highest speed?

• Just after it was launched  

• Just before it hits the ground  

• At the highest point of its flight

• Halfway between the ground and the highest

A volleyball is hit at an angle of 30˚ and it reaches a distance of 50 m.    

4. Given the same initial velocity, at what other angle should a ball be hit to reach the same distance?

   

• 15˚ 

• 45˚    

• 60˚

• 75˚

5.       How will you describe impulse as experienced by a certain body?

      

• it is the same as the change in its velocity

• it is the same as the change it its kinetic energy

• it is the equal to the change in its momentum

• it is equal to the change in potential energy

6.  In certain martial arts, people practice breaking a piece of wood with the side of their bare hand. Using your knowledge on impulse, how can you do this without injury to your hand?

• A.       Given the same change in momentum, when the time interval is smaller, the impact force is bigger.

• A.       Given the same change in momentum, when the time interval is bigger, the impact force is bigger.

• Given the same change in momentum, when the time interval is smaller, the impact force is smaller

• A.       Given the same change in momentum, when the time interval is bigger, the impact force is smaller.

7.       Two billiard balls approach each other at equal speed. If they collide in a perfectly elastic collision, how would you describe their velocities after collision?

• zero

• same in magnitude and direction

• Same in magnitude but opposite in direction

• different in magnitude and opposite in direction

8.       Two 0.5 kg balls approach each other with the same speed 1.0 m/s. If there is no external force acting on the system, how much momentum of the system there is after collision?

          

• 0

• 1.0 kg m/s   

• 0.50 kg m/s

• -1.0 kg m/s

9.       Which event is explained in the sequence of energy changes shown in the diagram below?

               Chemical energy     Heat     Mechanical Energy (with wasted heat)

               

• a blue spotlight is on 

• a runner doing stretches 

• an electric fan

• the battery-powered toy car runs forward

10.       How will you best illustrate the direct transformation of potential to kinetic energy?

          

• A volleyball player blocks an incoming ball.

• A sleeping cow stirs awake.

• The wide-open spring door closes slowly.

• The spring of a broken toy shoots up