Vectors and Motion

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1. When two cars A and B are next to one another (fig1), they are traveling in the same direction with speed v a and V b , respectively. If B maintains a constant speed, while A begins to decelerate at a, determine the distance between the car at the instant A stops. What should be condition of motion such that collision doesn’t occur? 2. A car travel east 2 km for 5 minute, then north 3 km for minutes, and then west 4 km for 10 minute. Determine the total distance travelled and the magnitude of displacement of the ca. Also calculate, the magnitude of the average velocity and the average speed? 3. A car traveling along the straight portions of the road has the velocities indicated in the figure when it arrive at point A B, and C. (fig2) If it takes 3s to go from A to B, and then 5s to go from B to C, determine the average acceleration between point A and B and between point A and C. 4. A particle travel along the curve from A to B in 1 s(fig3). If it takes 3 s for it to go from A to C, determine its average velocity when it goes from B to C. 5. The figure shows a circular path taken by a particle. If the instantaneous velocity of the particle is (2i2j) m/s, through which quadrant is the particle moving at that instant if it is traveling (a) clockwise and (b) counterclockwise around the circle? For both cases, draw v on the figure 4. 6. Four cars start from straight a straight road (indicated by the arrow in fig 5). In which case is the magnitude of average acceleration greatest after the cars leave the curved path. Assume the cars to be moving with constant speed throughout. 7. A particle leaves the origin with an initial velocity v i =3i m/s and a constant acceleration a= (i+0.5j)m/s 2 . When it reaches its maximum x coordinate, what are its (a) velocity and (b) position vector? 8. A cart is propelled over an xy plane with acceleration components a x = 4.0 m/s 2 and a y =2.0 m/s 2 . Its initial velocity has components V 0x =8.0 m/s and v 0y =12 m/s. In unitvector notation, what is the velocity of the cart when it reaches its greatest y coordinate? 9. A moderate wind accelerates a pebble over a horizontal xy plane with a constant acceleration: a= (i+i) m/s 2 . At time t=0, the velocity is (4.00i) m/s. What are the (a) magnitude and (b) angle of its velocity when it has been displaced by 12 m parallel to the x axis? 10. In Fig 6, particle A moves along the line y= 3m with a constant velocity v of magnitude 3 m/s and parallel to the x axis. At the instant particle A passes the y axis, particle B leaves the origin with a zero initial speed and a constant acceleration a of magnitude 2 m/s 2 . What angle θ between and the positive direction of the y axis would result in a collision? Figure 1 Figure 2 Figure 3 Figure 5 Figure 4 Figure 6 VECTORS AND MOTION BOTHRA CLASSES

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Transcript of Vectors and Motion

1. When two cars A and B are next to one another (fig1), they are traveling in the samedirection with speed va and Vb , respectively. If B maintains a constant speed, while A begins to decelerate at a, determine the distance between the car at the instant A stops. What should be condition of motion such that collision doesn’t occur? 

2. A car travel east 2 km for 5 minute, then north 3 km for minutes, and then west 4km for 10 minute. Determine the total distance travelled and the magnitude of displacement of the ca.  Also calculate, the magnitude of the average velocity and the average speed? 

3. A car traveling along the straight portions of the road has the velocities indicated inthe figure when it arrive at point A B, and C. (fig2) If it takes 3s to go from A to B, and then 5s to go from B to C, determine the average acceleration between point A and B and between point A and C. 

4. A particle travel along the curve from A to B in 1 s(fig3). If it takes 3 s for it to go from A to C,determine its average velocity when it goes from B to C. 

5. The figure shows a circular path taken by a particle. If the instantaneous velocity of theparticle is (2i‐2j) m/s, through which quadrant is the particle moving at that instant if it is traveling (a) clockwise and (b) counterclockwise around the circle? For both cases, draw v on the figure 4. 

6. Four cars start from straight a straight road (indicated by the arrow in fig 5).In which case is the magnitude of average acceleration greatest after the cars leave the curved path. Assume the cars to be moving with constant speed throughout. 

7. A particle leaves the origin with an initial velocity vi=3i m/s and a constant acceleration a= ‐(i+0.5j)m/s2. Whenit reaches its maximum x coordinate, what are its (a) velocity and (b) position vector? 

8. A cart is propelled over an xy plane with acceleration components ax = 4.0 m/s2 and ay=‐2.0 m/s2. Its initialvelocity has components V0x =8.0 m/s and v0y =12 m/s. In unit‐vector notation, what is the velocity of the cart when it reaches its greatest y coordinate? 

9. A moderate wind accelerates a pebble over a horizontal xy plane with a constant acceleration: a= (i+i) m/s2. At time t=0, the velocity is

(4.00i) m/s. What are the (a) magnitude and (b) angle of its velocity when it has been displaced by 12 m parallel to the x axis? 

10. In Fig 6, particle A moves along the line y= 3m with a constant velocity v of magnitude 3 m/s and parallel to the xaxis. At the instant particle A passes the y axis, particle B leaves the origin with a zero initial speed and a constant 

acceleration a of magnitude 2 m/s2. What angle θ between and the positive direction of the y axis would result in a 

collision? 

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VECTORS AND MOTIONBOTHRA CLASSES