A.4 Physics Quiz

What does Figure 1.32 demonstrate about the vertical motion of two objects, one dropped vertically and the other launched horizontally?

• The object launched horizontally falls faster.

• Both objects fall the same distance in the same time.

• The object dropped vertically falls slower.

• Both objects remain at the same height.

In the context of projectile motion, what is the significance of the vertical component of velocity for an object launched horizontally?

• It determines the horizontal distance traveled.

• It affects the time taken to hit the ground.

• It is zero, meaning it does not affect the vertical motion.

• It increases the vertical distance fallen.

According to the text, what happens to two objects, one dropped vertically and the other launched horizontally, when they are released from the same height?

• They hit the ground at different times.

• They hit the ground at the same time.

• The horizontally launched object hits the ground first.

• The vertically dropped object hits the ground first.

What does observer Y see when moving to the right with velocity (v/2) with respect to the ground?

• The black ball moving to the right with velocity v and the blue ball approaching with velocity -v

• The black ball moving to the right with velocity (v/2) and the blue ball approaching with velocity -(v/2)

• The black ball moving to the right with velocity (v/4) and the blue ball approaching with velocity -(v/4)

• The black ball moving to the right with velocity v and the blue ball approaching with velocity -(v/2)

According to Newtonian physics, what is true about the time it takes for two bodies to reach the ground when observed by any observer?

• The two bodies reach the ground at different times.

• The two bodies reach the ground at the same time.

• The two bodies never reach the ground.

• The two bodies reach the ground at random times.

What is the significance of Figure 1.33 in the context of the motion of the balls?

• It shows that the balls have different motions.

• It shows that the balls have identical motions from the point of view of observer Y.

• It shows that the balls have identical motions from the point of view of observer X.

• It shows that the balls have no motion.

What are the components of the initial velocity vector for a projectile launched at an angle θ to the horizontal with speed u?

• u_x = u cos θ and u_y = u sin θ

• u_x = u sin θ and u_y = u cos θ

• u_x = u cos θ and u_y = u cos θ

• u_x = u sin θ and u_y = u sin θ

What is the acceleration in the y-direction for a projectile in motion?

• g

• -g

• 0

• u sin θ

What is the horizontal component of velocity v_x at some later time t for a projectile launched at an angle θ with initial speed u?

• v_x = u sin θ

• v_x = u cos θ

• v_x = u cos θ - gt

• v_x = u sin θ - gt

What is the vertical component of velocity v_y at some later time t for a projectile launched at an angle θ with initial speed u?

• v_y = u cos θ

• v_y = u sin θ

• v_y = u sin θ - gt

• v_y = u cos θ - gt