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Physics 1 > Physics Test 3 > Flashcards

Physics Test 3 Flashcards

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1
Q

Which slide would give the girl the greatest speed at the bottom?

A. Steep 2 bumps 
B. Steep 1 bump 
C. Steep straight 
D. Steep hump
E. she would have the same speed at the bottom of each
A

E. she would have the same speed at the bottom of each

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2
Q 
An acorn falls from a tree. Compare its kinetic energy K, to its potential energy U. 
A. K increases and U decreases
B. K decreases and U decreases 
C. K increases and U increases 
D. K decreases and U increases
A

A. K increases and U decreases

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3
Q 
A mass is attached to one end of a string. The other end is attached to a rigid support. The mass is released at A and swings in a vertical arc to points B, C, and D. Neglect air resistant and use g=10 m/s^2. At what point does the mass have the most potential energy?
A. A highest point 
B. B second highest point 
C. C third highest point 
D. D lowest point
A

A. A highest point

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4
Q 
At what point does the mass have the most kinetic energy?
A. Highest point 
B. Second highest point 
C. Third highest point (straight down)
D. Lowest point
A

C. Third highest point (straight down)

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5
Q 
At what point does the mass have its highest speed?
A. Highest point 
B. Second highest point 
C. Straight down
D. Lowest point
A

C. Straight down

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6
Q

Swimmers at a water park can enter a pool using one of two frictionless slides of equal height. Slide 1 approaches the water with uniform slope; slide 2 dips rapidly first, then levels out. Is the speed at the bottom of slide 2 greater than, less than, or the same speed at the bottom of the slide?

A

The same

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7
Q

Is it possible for the gravitational potential energy of an object to be negative?
A. Yes
B. No

A

A. Yes

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8
Q

You and your friend both solve a problem involving a skier going down a slope, starting from rest. The two of you have chosen different levels for y=0 in this problem. Which of the following quantities will you and your friend agree on?
A. Skier’s change in PE
B. Skier’s final KE
C. Skier’s PE, skier’s change in PE, skier’s final KE
D. Skier’s PE and skier’s final KE
E. skier’s change in PE and skier’s final KE

A

E. skier’s change in PE and skier’s final KE

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9
Q 
Two paths lead to the top of a big hill. One is steep and direct, while the other is twice as long but less steep. How much more potential energy would you gain if you take the longer path?
A. The same 
B. Twice as much
C. Four times as much 
D. Half as much 
E. you gain no PE in either case
A

A. The same

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10
Q 
How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm?
A. Same amount of work
B. Twice the work 
C. Four time the work 
D. Eight times the work
A

C. Four times the work

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11
Q

A mass attached to a vertical spring causes the spring to stretch and the mass to move downwards. What can you say about the spring’s potential energy and the gravitational potential energy of the mass?
A. Both spring PE and gravitational PE decrease
B. Spring PE increases and gravitational PE decreases
C. Both spring PE and gravitational PE increases
D. Spring PE decreases and gravitational PE increases
E. spring PE increases and gravitational PE is constant

A

B. Spring PE increases and gravitational PE decreases

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12
Q 
Three balls of qualifying mass start from rest and roll down different ramps. All ramps have the same height. Which ball has the greater speed at the bottom of its ramp?
A. Steep and short 
B. Steep and medium long
C. Steep and longest 
D. Same speed for all balls
A

D. Same speed for all balls

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13
Q

Paul and Kathleen start from rest at the same time on frictionless water slides with different shapes. At the bottom, whose velocity is greater?
A. Paul
B. Kathleen
C. Both the same

A

C. Both the same

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14
Q

You see a leaf falling to the ground with constant speed. When you first notice it, the leaf has initial total energy PEi+KEi. You watch the lead until just before it hits the ground, at which point it has final total energy PEf+KEf. How do these energies compare?
A. PEi+KEi > PEf+ KEf
B. PEi+ KEi = PEf + KEf
C. PEi + KEi < PEf + KEf

A

A. PEi + KEi > PEf + KEf

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15
Q

What is an inelastic collision?

A

Momentum is conserved but kinetic energy is not conserved

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16
Q

What is a elastic collision?

A

Both momentum and kinetic energy are conserved

17
Q

A system of particles is known to have a total kinetic energy of zero. What can you say about the total momentum of the system?
A. Momentum of the system is positive
B. Momentum of the system is negative
C. Momentum of the system is zero

A

Momentum of the system is zero

18
Q

A net force of 200 N acts on a 100 kg boulder, and a force of the same magnitude acts on a 130 g pebble. How does the rate of change of this boulder’s momentum compare to the rate of change of the pebble’s momentum?
A. Greater than
B. Less than
C. Equal to

A

C. Equal to

19
Q

A net force of 200 N acts on a 100 kg boulder, and a force of the same magnitude acts on a 130 g pebble. How does the rate of change of this boulder’s velocity compare to the rate of change of the pebble’s velocity?
A. Greater than
B. Less than
C. Equal to

A

B. Less than

20
Q

A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension?
A. Tension does no work at all
B. Tension does negative work
C. Tension does positive work

A

A. Tension does no work at all

21
Q 
In the SI systems of units, power has the same units as 
A. Js/m
B. Jm/s
C. Nm/s
D. W/m
E. W/s
A

C. Nm/s

22
Q

You want to load a box into the back of a truck. One way is to lift it straight up through a height h, as shown, doing a work W1. Alternatively, you can slide the box up a loading ramp a distance L, doing a work W2. Assuming the box slides on the ramp without friction, which of the following is correct
A. W1W2

A

B. W1=W2

23
Q 
If an object has momentum, then it must also have 
A. Potential energy 
B. Kinetic energy 
C. Acceleration
D. Force
A

B. Kinetic energy

24
Q 
A simple pendulum, consisting of a mass m and a string of length L, swings upward, making an angle theta with the vertical. The work done by the tension force is 
A. Zero 
B. mgL
C. mgLcostheta
D. mgLsintgeta
E. mgLtantheta
A

A. Zero

25
Q 
If the units of your answer are kg*m^2/s^3, which of the following types of quantities could your answer be?
A. Kinetic energy 
B. Potential energy 
C. Force 
D. Power
E. work
A

E. power

26
Q

You’re driving down the highway and a big splatters into your windshield. Which experiences the greater impulse?
A. The bug
B. The car
C. Both experience the same impulse

A

C. Both experience the same impulse

27
Q

You’re driving down the highway and a bug splatters into your windshield. Which experiences the greater change in momentum?
A. The bug
B. The car
C. Both experience the same change in momentum

A

C. Both experience the same change in momentum

28
Q

In that situation, which experiences the greater acceleration?
A. The bug
B. The car
C. Both experience the same acceleration

A

A. The bug

29
Q

An inelastic collision of two objects is characterized by the following
A. Total momentum of the system is conserved
B. Total kinetic energy of the system remain constant
C. Both A and B are true
D. Neither A or B are true

A

A. Total momentum of the system is conserved

30
Q 
A .140 kg baseball is dropped from rest. It has a speed of 1.2m/s just before it hits the ground. It rebounds with a speed of 1m/s. The ball is in contact with the ground for .0140s. What is the average force extended by the ground on the ball during that time?
A. 2 N upward 
B. 2 N downwards 
C. 22 N upwards 
D. 22 N downwards 
E. O N
A

C. 22 N upwards

31
Q 
Two ice skaters push off against one another starting from a stationary position. The 45 kg skater acquire a speed of .375 m/s. What speed does the 60 kg skater acquire? 
A. .5 m/s
B. .281 m/s
C. .375 m/s
D. .75 m/s
E. 0 m/s
A

B. .281 m/s

Physics 1 (2 decks)

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