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35 Cards in this Set
- Front
- Back
- 3rd side (hint)
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In which of the following cases does a car have a negative velocity and a positive acceleration? A car traveling in the... A) -x direction at a constant 20m/s B) -x direction increasing speed C) +x direction increasing speed D)-x direction decreasing in speed E) +x direction decreasing speed |
D |
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At time t=0 an object is traveling to the right along the +x axis at a speed of 10.0 m/s with acceleration -2.0m/s^2. Which statement is true A) the object will slow down, eventually coming to a complete stop. B) The object cannot have a negative acceleration and be moving to the right. C) the object will continue to move to the right, slowing down but never coming to a complete stop. D) The object will slow down, momentarily stopping, then pick up speed moving to the left. |
D) The object will slow down, amomentarily stopping, then pick up speed moving to the left. |
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A ball is thrown straight up. What are the velocity and acceleration of the ball at the highest point in its path? A) v=0, a=0 B) v=0, a= 9.8m/s^2 up C) v=0, a= 9.8m/s^2 down D) v= 9.8m/s up, a=0 E) v= 9.8m/s down, a=0 |
C) v=0, a= 9.8m/s^2 down |
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You drop a rock off a bridge. When the rock has fallen 4 m, you drop a second rock. As the two rocks continue to fall, what happens to their velocities? A) Both increase at the same rate. B) The velocity of the rock increase faster then the velocity of the second. C) The velocity of the second rock increases faster than the velocity of the first. D) Both velocities stay constant. |
A) Both increase at the same rate |
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You drive 4km at 30km/h and then another 4km at 50km/h. What is your average speed for the whole 8-km trip? A) More than 40 km/h B) Equal to 40 km/h C) Less than 40 km/h D) Not enough information |
C) Less than 40 km/h |
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A ball is dropped from the top of a tall building. At the same instant, a second ball is thrown upward from ground level. When the two balls pass one another, one on the way up, the other on the way down, compare the magnitudes of there accelerations: A) The acceleration of the dropped ball is greater. B) The acceleration of the ball thrown upwards is greater. C) The acceleration of both balls is the same. D) The acceleration changes during the motion, so you cannot predict the exact value when the two balls pass each other. E) The accelerations are in opposite directions. |
C) The acceleration of both balls is the same. |
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A ball is thrown downward at a speed of 20 m/s. Choosing the +y axis pointing up the neglecting air resistance, which equations could be used to solve for the other variables? The acceleration due to gravity is g = 9.8 m/s^2 downward. A) v = (20 m/s) -gt B) y = y0 + (-20 m/s)t - (1/2) gt^2 C) v^2 = (20 m/s)^2 - 2g(y-y0) D) (20 m/s) = (v+v0)/2 E) all of the above |
B) y = y0 + (-20 m/s)t - (1/2) gt^2 C) v^2 = (20 m/s)^2 - 2g(y-y0) |
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You are adding vectors of length 20 and 40 units. Which of the following choices is a possible resultant magnitude? A) 0 B) 18 C) 37 D) 64 E) 100 |
C) 37 |
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The magnitude of a component of a vector must be A) Less than or equal to the magnitude of the vector. B) Equal to the magnitude of the vector. C) Greater than or equal to the magnitude of the vector. D) Less then, equal to, or greater then the magnitude of the vector. |
A) Less than or equal to the magnitude of the vector |
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You are in the middle of a large field. You walk in a straight line for 100 m, then turn left and walk 100 m more in a straight line before stopping. When you stop, you are 100 m from you starting point. By how many degrees did you turn? A) 90 B) 120 C) 30 D) 180 E) this is impossible. You cannot walk 200 m and be only 100 m away from where you started. |
B) 120 |
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A bullet fired from a rifle begins to fall A) as soon as it leaves the barrel. B) after air friction reduces its speed. C) not at all if air resistance is ignored. |
A) as soon as it leaves the barrel |
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One ball is dropped vertically from a window. At the same instant, a second ball is thrown horizontally from the same window. Which is the greater speed at ground level? A) The dropped ball. B) The thrown ball. C) Neither- they both have the same speed on impact. D) it depends on how hard the ball is thrown. |
B) The thrown ball. |
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You are riding in an enclosed train car moving at 90 km/h. If you throw a baseball straight up, where will the baseball land? A) In front of you. B) Behind you. C) In your hand. D) Can’t decide from the given information. |
C) In your hand. |
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A baseball is hit high and far. Which of the following statements is true? At the highest point? A) The magnitude of the acceleration is 0. B) The magnitude of the velocity is 0. C) The magnitude of the velocity is the slowest. D) More than one of the above is true. E) None of the above are true |
C) The magnitude of the velocity is the slowest. |
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A hunter is aiming horizontally at a monkey who is sitting in a tree. The monkey is so terrified when it sees the gun that it falls off the tree. At that very instant, the hunter pulls the trigger. What will happen? a. The bullet will hit the monkey because both the monkey and the bullet are falling downward at the same rate due to gravity. b. The bullet will miss the monkey because the monkey falls down while the bullet speeds straightforward. c. It depends on how far the hunter is from the monkey. d. The bullet will miss the monkey because although both the monkey and the bullet are falling downward due to gravity, the monkey is falling faster. |
b. The bullet will miss the monkey because the monkey falls down while the bullet speeds straightforward. |
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Which statements are not valid for a projectile? Take up as positive. Check all that apply. a. The projectile has the same x velocity at any point on its path. b. The acceleration of the projectile is positive and decreasing when the projectile is moving upwards, zero at the top, and increasingly negative as the projectile descends. c. The acceleration of the projectile is a constant negative value. d. The y component of the velocity of the projectile is zero at the highest point of the projectile's path. e. The velocity at the highest point is zero. |
b. The acceleration of the projectile is positive and decreasing when the projectile is moving upwards, zero at the top, and increasingly negative as the projectile descends. e. The velocity at the highest point is zero |
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A massive block is being pulled along a horizontal frictionless surface by a constant horizontal force. The block must be __________. a. continuously changing direction b. moving at constant velocity c. moving with a constant nonzero acceleration d. moving with continuously increasing acceleration |
c. moving with a constant nonzero acceleration |
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Velocity differs from speed in that velocity indicates a particle's __________ of motion. |
Direction |
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Unlike speed, velocity is a __________ quantity. |
Vector |
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A vector has, by definition, both __________ and direction. |
Magnitude |
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Speed differs from velocity in the same way that __________ differs from displacement |
Distance |
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Identify as scalar or vector quantity: 1. Position 2. Velocity 3. Displacement 4. Speed 5. Acceleration 6. Average velocity 7. Distance |
. Vector 2. Vector 3. Vector 4. Scalar 6. Vector 6. Vector 7. Scalar |
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When acceleration is negative that indicates the acceleration is opposite the direction of motion. True or false |
True |
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A red ball and a blue ball have the same diameter but the red ball weighs twice as much as the blue. Both are dropped from 2nd story balcony at the same time A) twice as long for the blue as red B) longer for blue but not twice C) twice as long for red as blue D) linger for red but not twice E) nearly the same time |
E) nearly the same time |
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If velocity = 0, does that mean acceleration = 0 |
No |
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If acceleration = 0, does that mean velocity = 0 |
No |
Maintaining speed on a highway |
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A satellite in orbit has a net acceleration because, even though its moving at a constant velocity gravity is still pulling it downward True or false |
False |
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Mass |
Scalor |
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Speed |
Scalor |
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Weight |
Vector |
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Force |
Vector |
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Velocity |
Vector |
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Distance |
Scalor |
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Acceleration |
Vector |
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Because an object has zero velocity at the peak of its arc, it also has zero total acceleration True or false |
False |
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