PHY Final Review

A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Which of the following statements about the direction of the velocity and acceleration of the ballas it is going up is correct?

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A) Both its velocity and its acceleration point upward.

B) Its velocity points upward and its acceleration points downward.

C) Its velocity points downward and its acceleration points upward.

D) Both its velocity and its acceleration point downward.

B

For general projectile motion with no air resistance, the horizontal component of a projectile’s acceleration

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A) Its always zero

B) Remains a non-zero constant

C) Continuously increases

D) Continuously decreases

E) First decreases and then increases

A

Which of the following is considered a vector?

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A) Pressure

B) Displacement

C) Temperature

D) Energy

E) Distance

B

If a vector gets multiplied by a negative number then its direction?

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A) Remains the same

B) Gets reversed

C) Gets halved

D) Gets doubled

E) Does not change

B

A pilot drops a package from a plane fluing horizontakky at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will ?

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A) Be behind the package

B) Be directly over the package

C) Be in front of the package

D) Depend on the speed of the plane when the package was released

B

Which of the following graphs represents an object at rest?

A

A car starts from rest and accelerates with a constant acceleration of 2.00 m/s² for 3.00s. The car then continues for another 3.00s at a constant velocity. How far has the car traveled from its starting point?

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A) 15m

B) 24m

C) 27m

D) 39m

E) 42.5m

C

The motions of a car and a truck along a straight road are represented by the velocity-time graph in the figure. The two vehicles are initially alongside each other at time t=0. At time T, what is true about these two vehicles since time t=0?

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A) The truck will have traveled further than the car

B) The car will have traveled further than the truck

C) The truck and the car will have traveled the same distance

D) The car will be travelling faster than the truck

A

A car is oving west (negative x-direction) and begins to slow down as it approaches a stoplight. Which of the following must be true about its accleration?

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A) The acceleration remains constant

B) The acceleration is in the positive direction

C) The acceleration changes as the car slows down

D)The acceleration is in the negative direction

B

An object moves in a circular path at a constant speed. Compare the direction of the object’s velocity and acceleration vectors.

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A) Both vectors point in the same direction

B) The vectors point in opposite directions

C) The vectors are perpendicular to each other

D) The acceleration is zero but the velocity is constant

C

Which one of the following graphs could possibly represent the vertical position as a function of time for an object in free fall?

B

An object is moving in projectile motion, where upward is considered the positive direction, and air resistance is ignored. Which of the following statements is true?

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A) The horizontal component of its velocity stays constant, which the vertical component of its acceleration is zero.

B) The vertical component of both its velocity and acceleration remains unchanged.

C) The horizontal velocity remains constant, and the vertical acceleration is equal to -g.

D) The vertical velocuty remains constant, while the vertical acceleration is equal to -g.

E) The horizontal velocity stays the same, but the horizontal acceleration is equal to -g.

C

The motion diagram shows an object moving along a curved path at a constant speed. At which of points A, C, and E does the object have zero acceleration?

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A) Point A only

B) Point C only

C) Point E only

D) Point A and C only

E) Points A, C, and E

B

You are swinging a 2.0kg rock in a circular path using a thin rope that is 2.5m long. If the rock’s acceleraiton is 9.8m/s², how long does it take to complete on revolution?

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A) 2.5s

B) 3.0s

C) 3.5s

D) 4.0s

B

From the edge of a roof top you toss a green ball upwards with initial speed v0 and a blue ball downwards with the same initial speed. Air resistance is negligible. When they reach the ground below?

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A) The green ball will be moving faster than the blue ball.

B) The blue ball will be moving faster than the green ball.

C) The two balls will have the same speed.

C

Which of these is a vector?

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A) Acceleration

B) Speed

C) Distance

A

Acceleration is a change in _____ over time

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A) Time

B) Velocity

C) Distance

D) Displacement

B

If you multiply a vector by a negative what happens to it?

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A) The direction stays the same

B) It gets bigger

C) It gets smaller

D) Its direction gets reversed

D