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PHYSICS Lab Final > lab final > Flashcards

lab final Flashcards

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1
Q

A force of 250 N is pulling on an object at an angle of 45° above the horizontal. Which is the correct pair of components of this force?

A

+177N, +177N

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2
Q

Which is NOT a valid observation from the tugofwar simulation in Lab 4?

A

Mass of cart changes with the net force

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3
Q

The object below is sitting on a rotating surface in the clockwise direction. It is currently in the 12 o’clock position.

A

-> velocity, downward arrow for acceleration and Force

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4
Q

Suppose an object is moving with a constant velocity. Make a statement concerning its acceleration.

A

The acceleration must be equal to zero

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5
Q

What is the period of oscillation for 500g mass that hangs on a spring constant of 15 N/m?

A

1.1 s

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6
Q

What is the kinetic energy of an object that has a total energy of 200 J if it has potential energy of 65 J?

A

135 J

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7
Q

Suppose a ball is thrown straight up and there is no air resistance. What is its acceleration just before it reaches its highest point?

A

Exactly g

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8
Q

When an object slows down, then the total work done on the object is negative.

A

True

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9
Q

A ball is pushed with an initial speed of 4.0 m/s down a hill and acquired a constant
acceleration of 1.6 m/s2. What is its speed at the bottom of the hill if it traveled for 8.0 s?

A

17 m/s

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10
Q

An oscillating object acted upon by a restoring force alone is undergoing acceleration.

A

True

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11
Q

What two properties of a wave contribute to the production of a standing wave?

A

Reflection and interference

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12
Q

When throwing a ball straight up, which of the following is true about its velocity v and
its acceleration a at the highest point in its path?

A

v =0, but a = 9.8

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13
Q

For a pendulum of mass 1 g, which statement is true?

A

All of the above

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14
Q

In the experiment on uniformly accelerated motion, what force was utilized to make the
cart move with constant acceleration across the ramp?

A

Gravity

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15
Q

If two vectors are given such that A + B = 0, what can you say about the magnitude and
direction of vectors A and B?

A

same magnitude, but must be in different directions

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16
Q

If the velocity of the car is non-zero, can the acceleration of the car be zero?

A

yes

17
Q

A billiard ball collides in an elastic head-on collision with a second identical ball. What is
the kinetic energy of the system after the collision compared to that before collision?

A

same

18
Q

A standing wave is oscillating at 350 Hz on a string. What is the wave speed?

A

210 m/s

19
Q

A ball is thrown with an initial velocity of 20 m/s at an angle of 60° above the horizontal.
If we can neglect air resistance, what is the horizontal component of its instantaneous
velocity at the exact top of its trajectory?

A

10 m/s

20
Q

A rock is projected horizontally with an initial speed of 2.50 m/s from the edge of a cliff
15.0 m high. How long does it take the rock to hit the ground?

A

1.75 s

21
Q

In the absence of air resistance, as an object travels through the air, the horizontal
component of the velocity vector

A

stays the same

22
Q

A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction?

A

Friction does negative work

23
Q

A child does 350 J of work while pulling a box from the ground up to his tree house with a rope. The tree house is 4.0 m above the ground. What is the mass of the box?

A

8.9 kg

24
Q

A car initially travelling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required to reach a speed of 90 km/h?

A

4.2s

25
Q

Alice and Bill are at the top of a building. Alice throws her ball downward. Bill simply drops his ball. Which ball has the greater acceleration just after release?

A

Neither, they both have the same acceleration

PHYSICS Lab Final (9 decks)

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