physics

When an object in free-fall has a postive velocity and a negative acceleration, what is happening to the objects motion? a. it is speeding up, moving down b. its is slowing down, moving down c. it is speeding up, moving upwards d. it is slowing down, moving upward

it is slowing down, moving upward

In a diagram, the length of a vector arrow represents the a. cause of the vector. b. direction of the vector. c. magnitude of the vector. d. type of vector.

magnitude of the vector.

In the absence of air resistance, the path of a projectile is a(n) a. parabola. b. polygon. c. straight line.

polygon.

If a car travels 25 miles east and then 25 miles north, what is the resulting vector? a. 45 b. 15 c. 25

resultant vector

A baseball is dropped off the top of the high school and falls for 5.7 seconds before hitting the ground. What was the balls final velocity just before hitting the ground? a. -13.2 m/s b. -55.9 m/s c. 48.2 m/s d. -318.4 m/s

-55.9 m/s

What is acceleration of an object traveling upward during free fall? a. -9.8m/s2 b. +9.8m/s2 c. +9.8m/s d. 0m/s

-9.8m/s2

A volleyball player hits a volleyball high over the net. The ball's vertical velocity (Vy) is least.... a. just before it strikes the ground. b. at the highest point of its path. c. just after it is tapped by the player. d. when the horizontal and vertical components of its velocity are equal.

. at the highest point of its path.

A___________________ represents the sum of two or more vectors. a. amplitude b. resultant vector c. scalar quantity d. integer

. resultant vector

A model rocket flies horizontally off the edge of a cliff at a velocity of 50.0m/s. If the canyon below is 100.0 m deep, how far from the edge of the cliff does the model rocket land? a. 117 m b. 226 m c. 321 m d. 145 m

226 m

If a car first travels 13 miles North, then 28 miles East, what is the resulting vector? a. 953 miles SE b. 24.67 miles NW c. 30.87 miles NE d. 15.43 miles NE

30.87 miles NE

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. Ignoring the effects of air resistance, if it takes 3.3 s, what is the height of the bridge? a. 75 m b. 53 m c. 36 m d. 14 m

53 m

A rock falls off of a high building and hits the ground in 12.0 seconds. Ignoring air-resistance, what is the distance it fell? a. 353.3 meters b. 58 meters c. 164.2 meters d. 706.3 meters

706.3 meters

A ball is thrown straight up, reaches a maximum height, then falls to the ground. Which of the following statements about the direction of the velocity and acceleration of the ball as it is going down is correct? a. Its velocity is positive, acceleration is negative. b. Its velocity and acceleration are both negative. c. Its velocity is negative, acceleration is positive. d. Its velocity and acceleration are both positive.

Its velocity and acceleration are both negative.

Which would hit the ground first if dropped from the same height in a vacuum—a feather or a metal bolt? a. They would be suspended in a vacuum. b. the feather c. the metal bolt d. They would hit the ground at the same time.

They would hit the ground at the same time.

True or false: An object moving upward can be an object in free-fall.

True

Which of the following is an example of projectile motion? a. a jet lifting off a runway b. a space shuttle orbiting Earth c. dropping an aluminum can into the recycling bin d. a baseball being thrown

a baseball being thrown

When referring to VECTOR quantities, magnitude refers to: a. a measurement of size or amount b. the direction of motion c. the angle of displacement d. the position of the reference point

a measurement of size or amount

Which of the following exhibits parabolic motion? a. a stone thrown into a lake b. a space shuttle orbiting Earth c. a leaf falling from a tree d. a train moving along a flat track

a stone thrown into a lake

If you increased the horizontal velocity of a projectile, such as a rocket, you would expect the horizontal distance traveled to_______________ . a. remain constant. b. equal zero. c. also increase. d. decrease.

also increase.

Which of the following quantities used to describe motion is an example of a vector quantity? a. average velocity b. distance c. speed d. time

average velocity

Robin Hood shoots an arrow straight up(no air resistance) with a velocity of 20 m/s, the acceleration of the arrow at its highest point is? a. 20 m/s2 b. -9.8 m/s2 c. 0 m/s2 d. 10 m/s2

b. -9.8 m/s2

Which of the following does not exhibit parabolic motion? a. a basketball thrown through a hoop b. a flat piece of paper released from a window c. a baseball thrown to home plate d. a frog jumping from land into water

b. a flat piece of paper released from a window

A rock falls from a high cliff. Ignoring air-resistance, what will its velocity be after 8 seconds of falling? a. -14.2 m/s b. -1.22 m/s c. -78.5 m/s d. -36.8 m/s

c. -78.5 m/s

Which of the following is a physical quantity that has a magnitude but no direction? a. vector b. frame of reference c. scalar d. resultant

scalar

Identify the following quantities as scalar or vector: the mass of an object, the number of leaves on a tree, wind velocity. a. vector, scalar, scalar b. vector, scalar, vector c. scalar, scalar, vector d. scalar, vector, scalar

scalar, scalar, vector

The resultant vector always goes from the... a. tip of the last to the tail of the first b. tail of the first to the tip of the last c. tip of the first vector to the tail of the last d. tail of the last to the tip of the first

tail of the first to the tip of the last

An object in free fall a. moves only downward. c. undergoes a velocity change of 9.81 m/s during each second. d. has a + positive acceleration going up and - negative acceleration going down

undergoes a velocity change of 9.81 m/s during each second.

What is the path of a projectile? a. volume b. velocity c. temperature d. mass

velocity

Which of the following is an example of a vector quantity? a. velocity b. temperature c. volume d. mass

velocity