Test 1 PHYC 101 Ball State

What is the average acceleration of an object whose velocity changes from 18 m/s to 10 m/s in 4.0 s? a. -8 m/s/s b. 8 m/s/s c. -4 m/s/s d. 4 m/s/s e. -2 m/s/s f. 2 m/s/s

-2 m/s/s

A car traveling at 24 m/s comes to a halt in 6 seconds. What is the acceleration in m/s/s of the car? a. 4 b. -4 c. 144 d. -144 e. can't be solved without the mass of the car

-4 m/s/s

A car accelerates at 2 m/s/s. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s. a. 15 seconds b. none of these c. 30 seconds d. 60 seconds e. 2 seconds

15 sec

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 4t2 + 5t + 3. What was the initial position of this object? a. 2 m b. 2.5 m c. 3 m d. 4 m e. 5 m f. 8 m g. 10 m h. cannot be determined from this equation

3 m

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t)=4t^2+5t+3. What was the initial position of this object? a. Cannot be determined from this equation b. 10 m c. 3 m d. 8 m e. 2 m f. 5 m g. 2.5 m h. 4 m

3 m

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 4t + 5. What was the initial velocity of this object? a. 0 b. 2 m/s c. 2.5 m/s d. 4 m/s e. 5 m/s f. 8 m/s g. 10 m/s h. cannot be determined from this equation

4 m/s

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car's acceleration in m/s/s? a. l m/s/s b. 2 m/s/s c. 3 m/s/s d. 4 m/s/s e. 5 m/s/s

4 m/s/s

What is the average acceleration of an object whose velocity changes from 10 m/s to 18 m/s in 2.0 s? a. -8 m/s/s b. 8 m/s/s c. -4 m/s/s d. 4 m/s/s e. -2 m/s/s f. 2 m/s/s

4 m/s/s

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 4t + 5. What was the initial position of this object? a. 0 b. 2 m c. 2.5 m d.4 m e. 5 m f. 8 m g. 10 m h. cannot be determined from this equation

5 m

If a car accelerates from rest at 2 m/s/s, its speed 3 seconds later will be about a. 2 m/s. b. 3 m/s. c. 6 m/s. d. 36 m/s.

6 m/s

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 4t2 + 5t + 3. What was the acceleration of this object? a. 3 m/s/s b. 2 m/s/s c. 2.5 m/s/s d. 4 m/s/s e. 5 m/s/s f. 8 m/s/s g. 10 m/s/s h. cannot be determined from this equation

8 m/s/s

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t)=4t^2+5t+3. What was the acceleration of this object? a. 2.5m/s/s b. 4 m/s/s c. 5 m/s/s d. 8 m/s/s e. 2 m/s/s f. 3 m/s/s g. 10 m/s/s

8 m/s/s

A 1-kg mass at the earth's surface weighs a. 1 N b. 4.9 N. c. 9.8 N. d. 10.8 N. e. none of these

9.8 N

Calculate the kinetic energy when a 2 kg mass travels at 10 m/s

K.E = (1/2) m v 2 = 0.5 * 2 * 10 * 10 = 100 J

Calculate the kinetic energy when a 2 kg mass travels at 5 m/s

K.E = (1/2) m v 2 = 0.5 * 2 * 5 * 5 = 25 J

Calculate the kinetic energy when a 4 kg mass travels at 10 m/s

K.E = (1/2) m v 2 = 0.5 * 4 * 10 * 10 = 200 J

Calculate the kinetic energy when a 4 kg mass travels at 5 m/s

K.E = (1/2) m v 2 = 0.5 * 4 * 5 * 5 = 50 J

How much work do you do on the object when you carry the 10 kg box 4 m across the room?

The amount of work done is zero. There is no force applied on the box to move across the room. Hence the force does not cause the displacement.

How much work do you do on the object when you push an object 3 m when applying a 10 N force?

W = F * d = 10 * 3 = 30 J

How much work do you do on the object when you lift a 20 N object 4 m?

W = Fg d = 20 * 4 = 80 J

How much work do you do on the object when you lift a 10 kg box 1 m?

W = Fg d = mg d = 10 * 10 * 1 = 100 J

How much work do you do on the object when you lift a 5 kg object 2 m?

W = Fg d = mg d = 5 * 10 * 2 = 100 J

A small child spins around and around on a merry-go-round. Is the child accelerating? a) Yes b)No

YES

Kaya slows down as she bicycles up a hill. Is she accelerating? a) Yes b)No

YES

The Newton is a unit of a) force. b) mass. c) density. d) inertia. e) both force and inertia

a) force.

The formula for speed is - a) speed = distance divided by time b) speed = time divided by distance c) speed = velocity divided by time d) speed = acceleration divided by velocity

a) speed = distance divided by time

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is a) zero. b) 10 km/hr. c) 110 km/hr. d) 1000 km/hr.

a) zero.

A bag of groceries has a mass of 10 kilograms and a weight of a. about 1 N. b. about 10 N. c. about 100 N. d. about 1000 N. e. more than 1000 N.

about 100 N

Meter per second per second (m/s/s) is the unit for a. Distance b. Velocity c. Acceleration d. Time

acceleration

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much a. inertia. b. mass. c. weight. d. all of these e. none of these

all of these

A car traveling at 24 m/s comes to a halt in 6 seconds. What is the acceleration in m/s/s of the car? a) 4 b) -4 c) 144 d) -144 e) can't be solved without the mass of the car

b) -4

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 4t + 5. What was the initial velocity of this object? a) 0 b) 4 m/s c) 2.5 m/s e) 5 m/s g) 10 m/s h) cannot be determined from this equation

b) 4 m/s

An object that is speeding up while moving to the right can be modeled pictorially by a series of dots that a) are evenly spaced b) get further apart with time c) get closer together with time

b) get further apart with time

Which of the following is not acceleration? a) stopping your car at an intersection b) riding your car straight down the street at a constant speed c) riding your car faster when you ride down a hill d) slowing down your car so you can make it up a hill.

b) riding your car straight down the street at a constant speed

Which of the following is not a vector quantity? a) Velocity b) speed c) acceleration d) all are vector quantities e) none are vector quantities.

b) speed

Acceleration is the change in velocity per unit - a) speed b) time c) distance d) velocity

b) time

Which of the following is speed and direction of motion? a) acceleration b) velocity c) motion d) speed

b) velocity

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car? a. 1000 kg b. 1500 kg c. 3000 kg d. 6000 kg e. none of these

b. 1500 kg ( m= F / a = 3000/2 )

Which takes more power - lifting a 10 lb sack of fertilizer 2 feet in 3 s, or lifting it 2 feet in 2 s? a. 2 feet in 3 s b. 2 feet in 2 s c. both take the same amount of

b. 2 feet in 2 s

What is the power rating when a horizontal force of 25 N is applied through a distance of 4.0 m, if it took 5.0 s? a. 20 J b. 20 W c. 100 W d. 100 J e. 500 J

b. 20 W

A girl pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration in meters per second per second? a. 0.3 b. 3.0 c. 10 d. 30 e. 300

b. 3.0 ( a = F/ m = 30/10 )

You stand on a weight scale in an elevator on the bottom floor. As the elevator starts moving upward, the reading on the scale is a. less than your "normal" weight because there is a net downward force on your body. b. less than your "normal" weight because there is a net upward force on your body. c. greater than your "normal" weight beacuse there is a net downward force on your body. d. greater than your "normal" weight because there is a net upward force on your body. e. equal to your "normal" weight because there is no net force on your body. f. equal to your "normal" weight because that's what a scale always shows.

b. less than your "normal" weight because there is a net upward force on your body.

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 4t2 + 5t + 3. What was the initial position of this object? a) 2 m c) 3 m e) 5 m g) 10 m h) cannot be determined from this equation

c) 3 m

If a car accelerates from rest at 2 m/s/s, its speed 3 seconds later will be about a) 2 m/s. b) 3 m/s. c) 6 m/s. d) 36 m/s.

c) 6 m/s.

A bag of groceries has a mass of 10 kilograms and a weight of a) about 1 N. b) about 10 N. c) about 100 N. d) about 1000 N. e) more than 1000 N.

c) about 100 N.

Which Distance-Time graph shape best represents an object moving with a constant speed? a) a horizontal line b) a vertical line c) any nonvertical line d) a parabola

c) any nonvertical line

The slower an object travels, the ____________________ its "Distance vs Time" graph will be. a) straighter b) curvier c) flatter d) steeper

c) flatter

15. An object that is slowing down while moving to the right can be modeled pictorially by a series of dots that a) are evenly spaced b) get further apart with time c) get closer together with time

c) get closer together with time

kilogram is a measure of an object's a) weight. b) force. c) mass. d) size

c) mass.

You stand on a weight scale in an elevator on the top floor. As the elevator starts moving downward, the reading on the scale is a. less than your "normal" weight because there is a net downward force on your body. b. less than your "normal" weight because there is a net upward force on your body. c. greater than your "normal" weight beacuse there is a net downward force on your body. d. greater than your "normal" weight because there is a net upward force on your body. e. equal to your "normal" weight because there is no net force on your body. f. equal to your "normal" weight because that's what a scale always shows.

c. greater than your "normal" weight beacuse there is a net downward force on your body.

An object is tossed upward. As it falls back down, its kinetic energy ____________ and its gravitational potential energy ____________. a. increases; increases b. decreases; decreases c. increases; decreases d. decreases; increases

c. increases; decreases

If no external forces are acting on a moving object it will a. continue moving at the same speed. b. continue moving at the same velocity. c. move slower and slower until it finally stops.

continue moving at the same speed

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to a. continue to follow a circular path. b. follow a straight-line path. c. increase its speed. d. revolve in a smaller circle.

continue to follow a circular path

Objects that are slowing down in the negative direction have Distance vs. Time graphs that a. Curve downward and get steeper b. Are straight lines that slope downward c. Curve downward and get flatter d. Are straight lines that slope upward e. Curve upward and get flatter f. Are straight lines that are horizontal g. Curve upward and get steeper

curve downward and get flatter

What is the initial position of an object that is modeled mathematically by the equation x(t) = 4t - 3, where x(t) is in meters when t is in seconds? a) -4 m b) 3 m c) 4 m d) -3 m e) 0

d) -3 m

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much a) inertia. b) mass. c) weight. d) all of these e) none of these

d) all of these

Which of the following does not change acceleration? a) change direction b) speed up c) slow down d) constant velocity

d) constant velocity

A positive displacement implies that an object a) is speeding up. b) is slowing down. c) is moving at a constant rate. d) moved in the positive direction. e) moved in the negative direction.

d) moved in the positive direction.

A positive velocity implies that an object a) is speeding up. b) is slowing down. d) moved in the positive direction. b) is slowing down. c) is moving at a constant rate. e) is moving in the negative direction.

d) moved in the positive direction.

The faster an object travels, the ____________________ its "Distance vs Time" graph will be. a) straighter b) curvier c) flatter d) steeper

d) steeper

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that a) the milk carton has no acceleration. b) there is an action-reaction pair of forces. c) gravity tends to hold the milk carton secure. d) the milk carton has inertia. e) none of these

d) the milk carton has inertia.

A car has a mass of 1000 kg and accelerates at 2 meters per second per second. What is the magnitude of the net force exerted on the car? a. 500 N b. 1000 N c. 1500 N d. 2000 N e. none of these

d. 2000 N( F = ma = 1000*2)

You stand on a weight scale in an elevator as it moves downward at a steady rate. The reading on the scale is a. less than your "normal" weight because there is a net downward force on your body. b. less than your "normal" weight because there is a net upward force on your body. c. greater than your "normal" weight beacuse there is a net downward force on your body. d. greater than your "normal" weight because there is a net upward force on your body. e. equal to your "normal" weight because there is no net force on your body. f. equal to your "normal" weight because that's what a scale always shows.

d. greater than your "normal" weight because there is a net upward force on your body.

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that a. the milk carton has no acceleration. b. there is an action-reaction pair of forces. c. gravity tends to hold the milk carton secure. d. the milk carton has inertia. e. none of these

d. the milk carton has inertia.

These two terms, distance and displacement, mean ____________thing. ( same, different)

different

Meter (m) is the unit for ______________________ (velocity, time, distance, mass).

distance

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 4t2 + 5t + 3. What was the initial velocity of this object? b) 2.5 m d) 4 m f) 8 m a) 2 m/s c) 3 m/s e) 5 m/s g) 10 m/s h) cannot be determined from this equation

e) 5 m/s

A negative velocity implies that an object a) is speeding up. b) is slowing down. c) is moving at a constant rate. d) is moving in the positive direction. e) is moving in the negative direction.

e) is moving in the negative direction.

A negative displacement implies that an object a) is speeding up. c) is moving at a constant rate. e) moved in the negative direction. b) is slowing down. d) moved in the positive direction.

e) moved in the negative direction.

What is the power rating when lifting a 1.0 kg mass a height of 2.0 m, if it took 2.0 s? a. 2 J b. 2 W c. 1 W d. 20 J e. 10 W f. 40 J

e. 10 W

Calculate the gravitational potential energy with respect to the floor of a 10 kg jar of pickles that rests on a shelf 2.0 m above the floor. a. 5 J b. 10 J c. 20 J d. 2 J e. 200 J

e. 200 J

You stand on a weight scale in an elevator as it moves upward at a steady rate. The reading on the scale is a. less than your "normal" weight because there is a net downward force on your body. b. less than your "normal" weight because there is a net upward force on your body. c. greater than your "normal" weight beacuse there is a net downward force on your body. d. greater than your "normal" weight because there is a net upward force on your body. e. equal to your "normal" weight because there is no net force on your body. f. equal to your "normal" weight because that's what a scale always shows.

e. equal to your "normal" weight because there is no net force on your body.

You stand on a weight scale in an elevator that is moving to the bottom floor. As the elevator slows to a stop, the reading on the scale is a. less than your "normal" weight because there is a net downward force on your body. b. less than your "normal" weight because there is a net upward force on your body. c. greater than your "normal" weight beacuse there is a net downward force on your body. d. greater than your "normal" weight because there is a net upward force on your body. e. equal to your "normal" weight because there is no net force on your body. f. equal to your "normal" weight because that's what a scale always shows.

e. equal to your "normal" weight because there is no net force on your body.

You stand on a weight scale in an elevator that is moving to the top floor. As the elevator slows to a stop, the reading on the scale is a. less than your "normal" weight because there is a net downward force on your body. b. less than your "normal" weight because there is a net upward force on your body. c. greater than your "normal" weight beacuse there is a net downward force on your body. d. greater than your "normal" weight because there is a net upward force on your body. e. equal to your "normal" weight because there is no net force on your body. f. equal to your "normal" weight because that's what a scale always shows.

e. equal to your "normal" weight because there is no net force on your body.

What is the average acceleration of an object whose velocity changes from 10 m/s to 18 m/s in 4.0 s? a) -8 m/s/s b) 8 m/s/s c) -4 m/s/s d) 4 m/s/s e) -2 m/s/s f) 2 m/s/s

f) 2 m/s/s

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 4t2 + 5t + 3. What was the acceleration of this object? b) 2.5 m/s d) 4 m/s f) 8 m/s a) 3 m/s/s c) 2.5 m/s/s e) 5 m/s/s f) 8 m/s/s g) 10 m/s/s h) cannot be determined from this equation

f) 8 m/s/s

The greater the spacing of the dots, the _________ the object was travelling. a. Both of them b. Slower c. Faster d. None of them

faster

The greater the spacing of the dots, the _____________________ the object was travelling. (Slower/ faster).

faster

The greater the spacing of the dots, the _____________________ the object was travelling. (slower/ faster).

faster

The Newton is a unit of a. force. B. mass. c. density. D. inertia. b. both force and inertia.

force

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 5t2 + 4t + 2. What was the acceleration of this object? a. 0 b. 2 m/s/s c. 2.5 m/s/s d. 4 m/s/s e. 5 m/s/s f. 8 m/s/s g. 10 m/s/s h. cannot be determined from this equation

g. 10 m/s/s

If one object has twice as much mass as another object, it also has twice as much a. inertia. b. velocity. c. acceleration due to gravity. d. volume. e. all of these

inertia

If your automobile runs out of fuel while you are driving the engine stops but you do not come to an abrupt stop. The concept that most explains why is a. inertia. b.gravity. c. acceleration. d.resistance.

inertia

A kilogram is a measure of an object's a. Weight b.force. c. mass. d. size.

mass

An object's weight may properly be expressed in units of a. meters. b. kilograms. c. Newtons. d. cubic centimeters. e.Joules.

newtons

An object's ___________ is its directed distance from a reference point. a. Acceleration b. Position c. Velocity d. Speed

position

An object's ______________ is its directed distance from a reference point. (Velocity, position, acceleration)

position

A displacement made by car is +5m implies the car travel 5m in _________________ direction. (negative, positive)

positive

A positive velocity indicates movement in the ___________ direction ( positive, Negative)

positive

Distance is a _______________________ quantity. (scalar, vector)

scalar

________________________ quantity has magnitude only. (scalar, vector)

scalar

In one dimensional motion an object move in a ____________________ (straight line, circle)

straight line

Your weight is a. equal to your mass. b. the gravitational attraction force between you and the Earth. c. a property of mechanical equilibrium. d. all of these

the gravitational attraction force between you and the Earth.

The seconds is the unit of _______________(velocity, time, distance, mass)

time

A force of 1 N accelerates a mass of 1 kg at the rate of 1 m/s/s. The acceleration of a mass of 2 kg acted upon by a net force of 2 N is a. half as much. b. twice as much. c. the same. d. none of these.

twice as much

Displacement is a ___________________ quantity. (scalar, vector)

vector

______________________ quantity has both magnitude and direction (scalar, vector)

vector

Meter per second (m/s) is the unit for ______________________ (velocity, time, distance, mass).

velocity

_________________tells how fast and in what direction. ( speed, Velocity)

velocity

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval, its acceleration is a. Zero b. 1000 km/hr c. 110 km/hr d. 10 km/hr

zero