AP Physics Quiz 1 Name _______________________ Work on it together, finish it at home.

1. A ball is thrown straight up, reaches a maximum height, then falls to its initial height. As the ball is coming down,

a) both its velocity and its acceleration point upward.b) its velocity points upward and its acceleration points downward.c) its velocity points downward and its acceleration points upward.d) both its velocity and its acceleration point downward.

2. When an object is released from rest and falls in the absence of friction, which of the following is true concerning its motion?

a) Its acceleration is constant.b) Its velocity is constant.c) Neither its acceleration nor its velocity is constant.d) Both its acceleration and its velocity are constant.

3. A ball is thrown straight up. When the ball reaches the highest pointa) both its velocity and its acceleration are zero.b) its velocity is zero and its acceleration is not zero.c) its velocity is not zero and its acceleration is zero.d) neither its velocity nor its acceleration is zero.

4. Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance between them

a) increases. y=1/2gt2

b) remains constant.c) decreases.d) increases and then decreases

5. Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. As time progresses, the velocity between them

a) increases.b) remains constant. v = vo + atc) decreases.d) increases and then decreases

6. Objects A and B both start at rest. They both accelerate at the same rate. However, object A accelerates for three times longer as object B. What is the final speed of object A compared to that of object B?

a) the same speedb) three times as fast v = vo + atc) six times as fastd) nine times as fast

7. Two objects are thrown at the same speed from the top of a tall building. One is thrown down, and the other is thrown up. What are their speeds when they hit the street? Circle all that apply

a) The one thrown down is traveling faster b) The one thrown up is traveling faster.c) They are traveling at the same speed just before they hit the groundd) Their accelerations are the samee) The acceleration of the thrown up ball is greater than the thrown down ball.f) The acceleration of the thrown up ball is less than the thrown down ball.

8. A ball is thrown straight up, reaches a maximum height, then falls to its initial height. As the ball is going up,

a) both its velocity and its acceleration point upward.b) its velocity points upward and its acceleration points downward.c) its velocity points downward and its acceleration points upward.d) both its velocity and its acceleration points downward.

1984 Basic Kinematics

9. The graph shows the velocity versus time for an object moving in a straight line. At what time after time = 0 does the object again pass through its initial position?

(A) Between O and 1 s(B) 1 s(C) Between 1 and 2 (D) 2 s(E)Between 2 and 3 s

10. A body moving in the positive x direction passes the origin at time t = 0. Between t = 0 and t = 1 seconds, the body has a constant speed of 24 meters per second. At t = 1 second, the body is given a constant acceleration of 6 meters per second squared in the negative x direction. The position x of the body at t = 11 seconds is

(A) +99 m(B) +36 m(C) -36 m

v = x t v = x = 1 s ( 24 m/s ) = 24 m t

x = xo + vot + ½ at2

x = 24 m + ( 24 m/s ) ( 10s ) + ½ (-6 m/s/s) ( 10s)2

x = - 36 m

(D) -75 m(E) -99 m

1988

11. The displacement x of an object moving along the x-axis is shown above as a function of time t. The acceleration of this object must be

(A) zero (B) constant but not zero (C) increasing (D) decreasing (E) equal to g

12. A truck traveled 400 meters north in 80 seconds, and then it traveled 300 meters east in 70 seconds. The magnitude of the average velocity of the truck was most nearly

(A) 1.2 m/s(B) 3.3 m/s(C) 4.6 m/s(D) 6.6 m/s(E) 9.3 m/s

1993

13. In which of the following situations would an object be accelerated?

I. It moves in a straight line at constant speed. II. It moves with uniform circular motion.III. It travels as a projectile in a gravitational field with negligible air resistance.

(A) I only (B) III only (C) I and II only (D) II and III only (E) I, II, and III

x = ( 400 m)2 + ( 300 m)2 = 500m

500 m/ 150 s = 3.3 m/s

14. A bullet moving horizontally with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the average deceleration, in m/s2, of the bullet? How long does it take to come to a rest? 8pts

Given Find F/R/S

vo =500 m/s a = ? m/s/s v2 = vo2 + 2 a x

x=10 cm = 0.10m t = ? m/s/s v2 - vo2 = 2 a x

V = 0 m v 2 -v o

2 = a = (0m/s) 2 –(500m/s) 2 = -1.25x106 m/s2

2 x 2(0.10m)

a = v – vo t

t = v - vo = 0 m/s – 500m/s = 4.00x 10-4 s a -1.25x106 m/s2

14. A package is released by a helicopter traveling 25 m/s upward 200 m from the ground. How long does it take the package to reach the ground, assuming no air resistance.

Given Find F/R/S yo = 200m t=?s (up) a = v – vo voy = 25 m/s tg = -9.8 m/s/svy = 0m t = v - vo = 0 m/s – 25 m/s = 2.55 s

a -9.8m/s/s

y = yo + vot + ½ gt2

y = 200m + 25 m/s ( 2.55s) + ½ (-9.8m/s/s) ( 2.55s)2

y = 232 m

y = yo + vot + ½ gt2

y = ½ gt2

2 y = t = 2 ( 232 m) = 6.88s g 9.8m/s/s

t up and t down = 2.55s + 6.88 s = 9.431s

y = yo + vot + ½ gt2 0 m = 200 m + (25 m/s ) t + ½ (-9.8m/s/s) t2

C=200 B=25 A = -4.9 therefore t = 9.43 s 15. A car is traveling towards a motorcycle at 25 m/s. The car is 1000 m from the motorcycle when the motorcycle accelerates from rest towards the car at 4.5 m/s2. How far will the car travel before they pass each other. How long will it take for the car and motorcycle to pass each other?

Given Find FRSAxmort + xcar =1000mxcar = ? m vcar = x car t vcar = xcar

xmort = ? m t vcar = 25 m/s t = ? s

xmort = vot + ½ at2

vomort = 0 m/s

amort = 0 m/s/s xmort = ½ at2

t vcar + ½ at2 = 1000 m

0 = 1000 m – t vcar + ½ at2

½ (4.5m/s/s) t2 + 25 m/s t - 1000 m = 0 m A=2.25 B=25 C=-1000m

t = 16.2 s

t vcar = xcar 16.2s (25 m/s) = 405 m

xmort = ½ at2 = ½ (4.5m/s/s) ( 16.2s)2 = 590.5m

16 An object is moving with constant non-zero velocity in the +x axis. The position versus time graph of this object is

a) a horizontal straight line.b) a vertical straight line.c) a straight line making an angle with the time axis. xd) a curve with an increasing slope

t

17 An object is moving with constant non-zero acceleration in the +x axis. The position versus time graph of this object is

a) a horizontal straight line.b) a vertical straight line. xc) a straight line making an angle with the time axis.d) a parabolic curve.

t

18 An object is moving with constant non-zero velocity in the +x axis. The velocity versus time graph of this object is

a) a horizontal straight line.b) a vertical straight line. vc) a straight line making an angle with the time axis.d) a parabolic curve. 0 m/s

t

19 The slope of a velocity versus time graph gives

a) positionb) velocity vc) accelerationd) displacment

time

20. The position versus time graph of an object is a horizontal line, the object is

a) moving with constant non-zero speed.b) moving with constant non-zero acceleration.c) at rest. xd) moving with infinite speed.

t20. If the position versus time graph of an object is a vertical line, the object is

a) moving with constant non-zero speed.b) moving with constant non-zero acceleration. x

c) at rest.d) moving with infinite speed.

t21. If the velocity versus time graph of an object is a straight line making an angle of 30 degrees with the time axis, the object is

a) moving with constant non-zero speed.b) moving with constant non-zero acceleration.c) at rest. vd) moving with infinite speed.

t

22. The area under a velocity vs time graph indicatesa) displacementb) velocityc) accelerationd) timee) none of the above

23. The area under a acceleration vs time graph indicatesa) displacementb) velocityc) accelerationd) timee) none of the above

AP Physics

1. An object moves in the positive x direction with just enough speed to reach the top of the incline and move down the incline to the same level on a frictionless surface.

b)Sketch a graph that will illustrate the change in x velocity as a function of time for this object on the graph below (8pts)

X

Velocity 0 m/s

time

AP Physics

2. An object moves in the positive x direction with just enough speed to reach the top of the incline and move down the incline to the same level on a frictionless surface.

a) Sketch a graph that will illustrate the change in x position as a function of time for this object on the graph below (8pts)

X

Position

meters

time