Question

# 1.What's the difference between velocity and speed? A. Velocity has direction B. Speed is measured in...

1.What's the difference between velocity and speed?

 A. Velocity has direction
 B. Speed is measured in m/s
 C. Speed is faster than velocity
 D. There is no difference

2. Which of the following statements are true about impulse? (Select all that apply)

 A. Objects involved in collisions encounter impulses
 B. The kg•m/s is equivalent to the units on impulse
 C. Impulse is a force
 D. The Newton is the unit for impulse
 E. In a collision, the net impulse experienced by an object is equal to its momentum change
 An object which is traveling east would experience a westward directed impulse in a collision
 Impulse is a vector quantity

3. A force of 100 N acting for 0.1 seconds would provide an impulse of:

 A. 5 N
 B. 100 N
 C. 1 N
 D. 10 N
 E. None of the above

4. Which of the following statements are true about momentum? (Select all that apply)

 A. The momentum of an object varies directly with the speed of the object
 B. An object which is moving at a constant speed has momentum
 C. A less massive object can never have more momentum than a more massive object
 D. The standard unit on momentum is the Joule
 An object with mass will have momentum
 E. Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum
 F. Momentum is a vector quantity

5. What happens to momentum if velocity is decreased?

 A. It changes direction
 B. It continues the same
 C. It increases
 D. It decreases

6. A truck driving along a highway road has a large quantity of momentum. If it moves at the same speed but has twice as much mass, its momentum is:

 A. Zero
 B. Unchanged
 C. Doubled

1) A. Velocity has direction

2)

A. Objects involved in collisions encounter impulses

B. The kg•m/s is equivalent to the units on impulse

E. In a collision, the net impulse experienced by an object is equal to its momentum change

Impulse is a vector quantity

3) D

I = Ft = 100*0.1 = 10

4)

A. The momentum of an object varies directly with the speed of the object

B. An object which is moving at a constant speed has momentum

E. Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum

F. Momentum is a vector quantity

5)

D

6)

C. Doubled

momentum p = mv So as the mass is doubled, p also doubles.

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