Velocity is a ______________ quantity that describes the ______________ and _____________ of an object. scalar; speed; acceleration vector; speed; direction

Velocity is a quantity that describes the  and  of an object.

1. scalar; speed; acceleration
2. vector; speed; direction

Unit 1 Quiz

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Read each question carefully. Choose the correct answer (1 point each)

1. Velocity is a ______________ quantity that describes the ______________ and _____________ of an object.
   1. scalar; speed; acceleration
   2. vector; speed; direction
   3. vector; weight; magnitude
   4. scalar; speed; direction
2. Acceleration is the change of an object’s _________________ over a certain amount of time.
   1. speed
   2. distance
   3. force
   4. velocity
3. If a book sits on a table and is not moved, this is a demonstration of the book’s
   1. inertia
   2. force
   3. acceleration
   4. impulse
4. A horse-cart is being pulled by a two-horse team. Each horse applies 500 N of force. What is the net force acting on the horse-cart?
   1. 500 N
   2. 250 N
   3. 750 N
   4. 1000 N
5. Jenny is walking downtown. She walks west at a speed of 4.0 kilometers per hour for 10 minutes. She then turns north and walks at a speed of 3.0 kilometers per hour for another ten minutes. What is the velocity of the resultant vector?
   1. 3 km/hr
   2. 5 km/hr
   3. 4 km/hr
   4. 7 km/hr

6. A box is pushed along the ground with a force of 10 N. The frictional force acting on the box has a value of 5 N. What is the net force acting on the box?
7. 5 N
8. 10 N
9. 15 N
10. 20 N

Read each question carefully. Be sure to show all work when solving with equations. Use scratch paper if needed.

1. What is the difference between mass and weight? (2 pts)

2. Why does a bowling ball fall faster than a feather on Earth’s surface? (2 pts)

3. A moped and an SUV are driving at the same speed. If they collide head on and get tangled together, will the system accelerate? Explain. (2 pts)

4. A 2 kg sticky ball is rolling along a smooth surface at a rate of 1 m/s. It collides with a 3 kg sticky ball which is at rest. If the balls stick together, what is the velocity of the balls after the collision? (3 pts)

5. A heavyweight boxing match is underway. One boxer delivers a straight punch to the other’s face. The recipient of the punch leans back to avoid the full impact. Explain how the boxer’s evasive action relates to impulse. (3 points)

6. What is the force of a 1000 kg car hitting a brick wall at a speed of 10 m/s? Assume the car comes to rest in 0.25 seconds. (5 pts)

7. Explain how you could estimate the height of a building using only a tennis ball and a stopwatch. (2 pts)