ctice # 1: Chapters 2, 3, 4, 5 and 6 The average speed of a horse that gallops a
ID: 1583434 • Letter: C
Question
ctice # 1: Chapters 2, 3, 4, 5 and 6 The average speed of a horse that gallops a distance of 10 kilometers in a time of 30 minutes B) 20 km/h. D) more than 30 km/h. A) 10 km/h. 30 km/h. 2) A force is a vector quantity because it ) action and reaction counterparts. 3) magnitude and direction. ) mass and acceleration. it has both ) If an object's mass is decreasing ) increases. while a constant force is applied to the object, the acceleration C) remains the same. B) decreases. constant velocity is A) 10 N. ve oiio sliding object is 10 newtons. The applied force needed to maintain a B)more than 10N. C)less than 10N. ) Two factors that greatly affect air resistance on falling objects are t A) size and weight of the object. B) size and mass of the object. C) size and speed of the object 6) When a falling object has reached its terminal velocity, its acceleration is A) g B) zero. C) constant. 7) Whenever the net force on an object is zero, its acceleration A) is zero. B) may be zero. 12) 1f you push an object twice as far while applying the same force you do A) four times as much work. B) twice as much work. C) the same amount of wo 13) If you push an object with twice the work input for twice the time, your power input is A) twice. B) the same amount as for half the work in half the time. C) four times as much. done quickly. Both jobs require the same 14) A job is done slowly, while an identical job is amount of work, but different amounts of B) energy. C) both of these. D) none of these. A) powerExplanation / Answer
1. average speed = distance/ time
= 10/ 0.5
= 20 km/hr
2. magnitude and direction
3. force = mass* acceleration.
so acceleration increases.
4. for constant velocity applied force should be equal to friction force. so
10 N
5. size and speed of the object.
6. acceleration is zero.
7. acceleration is zero.
12. twice work
13. the same amount.
14. power
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