The horizontal and vertical parts of a diagonal vector. A.Resultants B.Components C.Cosecants D.Hypotenuses B

The path of a projectile is called its: A.Trail B.Trajectory C.Route D.Projection B

The trajectory of a launched projectile is a A.Straight line B.Hyperbola C.Parabola D.Circular arc C

A ball is thrown straight up. At its highest point its velocity is ____ and its acceleration is _____ A.0, 0 B.0, 9.8 m/s 2 down C.9.8 m/s, 0 D.9.8 m/s, 9.8 m/s 2 up B

If air resistance is negligible the acceleration of an object in free fall (on Earth) ______ A.Depends on how heavy it is B.Is 9.8 m/s 2 upward if the object is moving up and 9.8 m/s 2 downward if the object is moving down. C.Is 9.8 m/s 2 down regardless of the direction the object is moving. C

Speed a dropped object will be traveling 3 seconds later is most nearly: A.10 m/s B.15 m/s C.25 m/s D.30 m/s D

If an object is thrown straight upward at 23 m/s what is its velocity 2.0 seconds later A.About 10 m/s up B.About 10 m/s down C.About 3 m/s up D.About 3 m/s down C

A ball thrown straight upward takes approximately 2 seconds to reach its highest point. At what speed was it thrown? A.5 m/s B.10 m/s C.20 m/s D.30 m/s E.40 m/s C

A ball that is thrown straight up at 30 m/s reaches a maximum height of A.10 m B.30 m C.45 m D.90 m C

A ball is thrown straight upward at 20 m/s. It returns to where it was thrown in about: A.1.0 s B.2.0 s C.3.0 s D.4.0 s D

The horizontal acceleration of a projectile on earth. A.+9.8 m/s 2 B.-9.8 m/s 2 C.0.0 m/s 2 D.-32 ft/s 2 C

As a projectile falls its horizontal velocity _______. A)stays the same B)is accelerated by gravity C)is accelerated by the launcher D)is zero A

As a projectile falls its vertical velocity _________. A)stays the same B)is accelerated by gravity C)is accelerated by the launcher D)is zero B

What is the direction of a projectile’s velocity at the highest point in its motion? A)no velocity B)just horizontal C)just vertical D)both horizontal and vertical E)big & negative B

A projectile is launched at an angle from a level surface. What would the horizontal position (x) vs. time graph look like? Time (s) Position vs. Time Position (m) Time (s) Position vs. Time Position (m) Time (s) Position vs. Time Position (m) Time (s) Position vs. Time Position (m) Time (s) Position vs. Time Position (m) Time (s) Position vs. Time Position (m) E) A) F) C)B) D) A

What would the vertical position (y) vs. time graph look like? Time (s) Position vs. Time Position (m) Time (s) Position vs. Time Position (m) Time (s) Position vs. Time Position (m) Time (s) Position vs. Time Position (m) Time (s) Position vs. Time Position (m) Time (s) Position vs. Time Position (m) E) A) F) C)B) D) E

What would the horizontal velocity (v x ) vs. time graph look like? Time (s) Velocity vs. Time Velocity (m/s) Time (s) Velocity vs. Time Velocity (m/s) Time (s) Velocity vs. Time Velocity (m/s) Time (s) Velocity vs. Time Velocity (m/s) Time (s) Velocity vs. Time Velocity (m/s) Time (s) Velocity vs. Time Velocity (m/s) E) A) F) C)B) D) A

What would the vertical velocity (v y ) vs. time graph look like? Time (s) Velocity vs. Time Velocity (m/s) Time (s) Velocity vs. Time Velocity (m/s) Time (s) Velocity vs. Time Velocity (m/s) Time (s) Velocity vs. Time Velocity (m/s) Time (s) Velocity vs. Time Velocity (m/s) Time (s) Velocity vs. Time Velocity (m/s) E) A) F) C)B) D) F

You jump off a springboard at an angle and dive gracefully into a pool. At the peak of your jump, your vertical velocity is _____________. A.positive & constant B.positive & changing C.negative & constant D.negative & changing E.zero & constant F.zero & changing F

You jump off a springboard at an angle and dive gracefully into a pool. At the peak of your jump, your horizontal velocity is _____________. A.positive & constant B.positive & changing C.negative & constant D.negative & changing E.zero & constant F.zero & changing A

A baseball is hit upward and travels along a parabolic arc before it strikes the ground. Which of the following statements is true? A.The acceleration of the ball decreases as the ball moves upward B.The velocity of the ball is zero when the ball is at the highest point in the arc C.The acceleration of the ball is zero when the ball is at the highest point in the arc D.The x-component of the ball’s velocity is the same throughout the ball’s flight E.The velocity of the ball is a maximum at the highest point in the arc. D

How do the x an y components of the velocity vector compare at points B & C? A.The velocity components are non-zero at B and zero at C. B.The x-components are the same; the y component at C is zero C.The x components are the same; the y component has a larger magnitude at C than at B. D.The x component is larger at C than at B; The y component at B points up while at C, it points downward. E.The x component is larger at B than at C; the y-component at B points down while at C, it points upward. B

How do the x and y components of the ball compare at the points A & D? A.The velocity components are non-zero at A and are zero at D. B.The velocity components are the same in magnitude and direction at both points. C.The velocity components have the same magnitudes at both points, but their directions are reversed. D.The velocity components have the same magnitudes at both points but the direction of the x components are reversed. E.The velocity components have the same magnitudes at both points, but the directions of the y-components are reversed. E

Which statement is true concerning the ball when it is at point C? A.The ball’s velocity and acceleration are both zero B.The ball’s velocity is perpendicular to its acceleration C.The ball’s velocity is not zero, but its acceleration is zero D.The ball’s velocity is zero, but its acceleration is not zero. E.The horizontal and vertical components of the ball’s velocity are equal. B

At which point is the velocity vector changing most rapidly with time? A.A B.B C.C D.D E.It is changing at the same rate at all 4 points. E

A projectile is launched horizontally from a cliff at 40 m/s. Three seconds later the horizontal component of its velocity is: A.10 m/s B.30 m/s C.40 m/s D.50 m/s C

A projectile is launched horizontally from a cliff at 40 m/s. Three seconds later the vertical component of its velocity is about: A.10 m/s B.30 m/s C.40 m/s D.50 m/s B

A projectile is launched horizontally from a cliff at 40 m/s. Three seconds later its speed is: A.10 m/s B.30 m/s C.40 m/s D.50 m/s D

A projectile is launched at 20 m/s at an angle of 30 o above horizontal. The horizontal component of its initial velocity is: A.20 m/s B.10 m/s C.17.3 m/s D.19.6 m/s C

A projectile is launched at 20 m/s at an angle of 30 o above horizontal. The vertical component of its initial velocity is: A.10 m/s B.20 m/s C.17.3 m/s D.9.8 m/s A

A projectile is launched at 20 m/s at an angle of 30 o above horizontal. At its highest point the total velocity is ____ and the acceleration is _____. A.20 m/s 9.8 m/s/s B.0.0 m/s 9.8 m/s/s C.10 m/s 0 m/s/s D.17.3 m/s 0 m/s/s E.17.3 m/s 9.8 m/s/s E

A projectile is launched at 20 m/s at an angle of 30 o above horizontal. The amount of time it remains airborne is about. A.1.0 seconds B.2.0 seconds C.4.0 seconds D.6.0 seconds B

A projectile launched at 20 m/s at an angle of 30 o lands on a level surface. How far away does it land? A.40 meters B.20 meters C.34 meters D.9.8 meters E.17 meters C

A rock kicked horizontally at 10 m/s from the edge of a cliff lands 55 m from the base of the cliff. How long is the rock in the air? A.1.0 s B.1.2 s C.3.4 s D.5.5 s E.11.2 s D

What is the approximate height of the cliff? A.27 m B.54 m C.150 m D.300 m E.730 m C

A projectile is fired at an angle of 60 o above horizontal with an initial speed of 30 m/s. What is the magnitude of the horizontal component of the projectile’s displacement at the end of 2 s? A.30 m B.40 m C.10 m D.20 m E.50 m A

A projectile is fired at an angle of 60 o above horizontal with an initial speed of 30 m/s. How long does it take the projectile to reach the highest point in its trajectory? A.1.5 s B.2.7 s C.4.0 s D.6.2 s E.9.8 s B

A student standing on the edge of a cliff throws a stone vertically downward with an initial speed of 10 m/s. The instant before the stone hits the ground below, it is traveling at a speed of 30 m/s. If the physics student were to throw the rock horizontally outward from the cliff instead, with the same initial speed of 10 m/s, how fast would the stone be traveling just before it hits the ground? A.10 m/s B.20 m/s C.30 m/s D.40 m/s E.The height of the cliff must be specified to answer this question. C