Review 4 (Linear Kinematics) Flashcards by Keeboon Ng

It takes a swimmer 1 hour to cross a lake that is 1 km wide. Which of the following is true of the swimmer’s acceleration?

Question options:

1) It cannot be determined from the information given.

2) It is equal to velocity squared.

3) It is 1 km/hr.

4) It is 1 km/hr2.

It cannot be determined from the information given.

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Which of the following is NOT a kinematic quantity?

Question options:

1) Distance

2) Acceleration

3) Force

4) Displacement

Force

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A ball rolling across a field with an acceleration of -0.5 m/s2 rolls 12.5 m and then comes to a stop after 8 seconds. What was the ball’s initial speed?

Question options:

1) 12.5 m/s

2) 4 m/s

3) 6.25 m/s

4) 16 m/s

4 m/s

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A ball is kicked with an initial velocity of 10 m/s at an angle of 30°. Neglecting air resistance, which is the speed of the ball at landing?

Question options:

1) 10 m/s

2) 10 m/s multiplied by the sine of 30 degrees

3) 10 m/s multiplied by the cosine of 30 degrees

4) None of the above

10 m/s

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The meter is the unit of measurement for which of the following?

Question options:

1) Distance

2) Distance and Displacement

3) Speed

4) Displacement

Distance and Displacement

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Which quantity is calculated as the inverse of speed?

Question options:

1) Acceleration

2) Pace

3) Velocity

4) None of the above

Pace

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Which of the following is/are used to indicate direction of displacement?

Question options:

1) Negative

2) North

3) Right

4) All of the above

All of the above
(Negative) , (North) , (Right)

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If velocity is constant, then acceleration is which of the following?

Question options:

1) Need more information

2) Constant, but not necessarily zero

3) Zero

4) Changing

Zero

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What is the average velocity of a cyclist who covers 5 km in 30 minutes?

Question options:

1) 5 km/hr

2) 10 km/hr

3) 60 km/hr

4) 30 km/hr

10 km/hr

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If acceleration is constant and positive, what is the velocity?

Question options:

1) Increasing

2) Decreasing

3) Need more information

4) Zero

Increasing

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Which of the following is/are true regarding the apex in the trajectory of a projectile?

Question options:

1) It is the highest point in the flight.

2) Vertical velocity is 0.

3) Direction changes.

4) All of the above.

All of the above
(It is the highest point in the flight) , (Vertical velocity is 0) , (Direction changes)

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Which of the following affects the time that a horizontally projected object remains in the air?

Question options:

1) Mass

2) Projection height

3) Weight

4) All of the above

Projection height

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Which of the following statements is true regarding objects projected from the same level as they land?

Question options:

1) Time up and time down are equal.

2) Angle of decent is equal to angle of takeoff.

3) Both statements are true.

4) Neither of the statements is true.

Both statements are true
(Time up and time down are equal) , (Angle of decent is equal to angle of takeoff)

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When final velocity is larger than initial velocity, the acceleration is:

Question options:

1) Average

2) Positive

3) Zero

4) Negative

Positive

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Why does running downhill tend to increase running speed?

Question options:

1) Increased stride length

2) Increased stride frequency

3) Both increased stride length and frequency

4) None of the above

Increased stride length

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Linear distance traveled per unit of time describes which of the following?

Question options:

1) Displacement

2) Speed

3) Velocity

4) Acceleration

Speed

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Why do elite long jumpers have take-off angles far less than the optimal 45°?

Question options:

1) Take-off velocity is higher during lower take-off angles

2) Relative take-off height is zero

3) Both A and B

4) None of the above

Take-off velocity is higher during lower take-off angles

The shape of a projectile’s trajectory is influenced by which of the following?

Question options:

1) Speed of projection

2) Angle of projection

3) Air resistance

4) Speed of projection and air resistance

Speed of projection and air resistance

What factor(s) distinguishes elite sprinters from non-elite performers?

Question options:

1) Stride length

2) Stride frequency

3) Both stride length and frequency

4) None of the above

Stride frequency

A ball is tossed vertically upward from a height of 2 m with an initial velocity of 10 m/s. Just before the ball hits the ground, its velocity will be which of the following?

Question options:

1) 10 m/s

2) Less than 10 m/s

3) Greater than 10 m/s

4) Not possible to predict

Greater than 10 m/s

The laws of constant acceleration can be applied to which of the following?

Question options:

1) Horizontal component of projectile motion

2) Vertical component of projectile motion

3) Resultant of projectile motion

4) Horizontal and vertical components of projectile motion

Horizontal and vertical components of projectile motion

In which of the following track events is distance most likely equal to displacement?

Question options:

1) 100 m dash

2) 200 m dash

3) 400 m dash

4) 5K road race (starting line is finish line)

100m dash

If the velocity of a sailboat changes from 4 m/s to 2 m/s over a period of time, which of the following is true of the sailboat’s acceleration?

Question options:

1) It is equal to zero.

2) It is positive.

3) It is equal to 2 knots/hr.

4) It is negative.

It is negative.

Which of the following factors typically exerts the most influence on the horizontal displacement obtained by a projectile?

Question options:

1) Projection angle

2) Relative height of projection

3) Initial speed of projection

4) Initial acceleration of projection

Initial speed of projection

Which of the following represents vertical acceleration of a projectile? Question options: 1) –9.81 m/s 2) 0 m/s2 3) 0 m/s 4) –9.81 m/s2

–9.81 m/s2

Which of the following components of projectile is affected by gravity? Question options: 1) Vertical component 2) Both horizontal and vertical components 3) Depends on the individual situation 4) Horizontal component

Vertical component

A runner moving at a velocity of 6 m/s increases the velocity in a 2 s time interval to a rate of 10 m/s. Which of the following is the rate of acceleration? Question options: 1) 4 m/s^2 2) -2 m/s^2 3) 4 m/s 4) 2 m/s^2

2 m/s^2

Neglecting the effect of air resistance, which of the following is/are true regarding the horizontal component of projectile velocity? Question options: 1) Remains constant throughout flight 2) Changes according to gravitational acceleration 3) Equals to 0 4) None of the above

Remains constant throughout flight

When a long jump performance is analyzed, which of the following is likely to be of the most interest? Question options: 1) The average velocity of the jumper during the run-up 2) The instantaneous velocity of the jumper at takeoff 3) The average velocity of the jumper during the flight 4) The instantaneous velocity of the jumper at landing

The instantaneous velocity of the jumper at takeoff

Which of the following is/are scalar quantity(ies)? Question options: 1) Displacement 2) Distance 3) Speed 4) Distance and speed

Distance and speed

Once a projectile is airborne, it is affected by which of the following? Question options: 1) Gravity 2) Release velocity 3) Air resistance and gravity 4) Air resistance

Air resistance and gravity

Which of the following represents horizontal acceleration of a projectile? Question options: 1) 0 m/s 2) –9.81 m/s^2 3) –9.81 m/s 4) 0 m/s^2

0 m/s^2

A runner completes 1 full lap around a 400 meter track. What is her displacement? Question options: 1) Need more information 2) 400 meters 3) Zero 4) 400 meters X 2π

Zero

Runner #1 changes her velocity from 8 m/s to 11 m/s. Runner #2 changes hers from 7 m/s to 10 m/s. Who has the higher acceleration? Question options: 1) Runner #1 2) Runner #2 3) Both have same acceleration 4) Need more information

Need more information

The negative sign in front of the acceleration due to gravity (-9.81 m/s2) can mean which of the following? Question options: 1) The projectile is traveling down and speeding up (negative direction) 2) The projectile is traveling up and slowing down (negative acceleration) 3) Both A and B 4) None of the above

Both A and B The projectile is traveling down and speeding up (negative direction) & The projectile is traveling up and slowing down (negative acceleration)

In a 5K road race, the finish line is also the starting line. What does 5K represent? Question options: 1) Velocity 2) Speed 3) Distance 4) Displacement

Distance

Vector mechanics apply to which of the following? Question options: 1) Displacement and Velocity 2) Speed 3) Velocity 4) Displacement

Displacement and Velocity

Which of the following is an example of projectile motion? Question options: 1) A badminton shuttlecock during flight 2) A long jumper while in the air 3) Both A and B

Both A and B (A badminton shuttlecock during flight) & (A long jumper while in the air)

In the formula v2 = v1, which of the following is known about acceleration? Question options: 1) Need more information 2) Acceleration = 0 m/s^2 3) Acceleration = –9.81 m/s^2

Acceleration = 0 m/s^2

The Greek letter Δ (delta) is typically used to represent which of the following? Question options: 1) Distance 2) Displacement 3) Time 4) Change in

Change in