Physics - Ball State - Joel Bryan - Midterm

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A baseball is tossed upward with an initial velocity of +24 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is the value of its acceleration 4 seconds after release?

-10 m/s/s

A baseball is tossed upward with an initial velocity of +36 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is the value of its acceleration immediately after it begins falling from its highest point?

-10 m/s/s

-10/s/s

-10m/s/s

-36 m/s

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?

-3m

A 10-N falling object encounters 10 N of air resistance. The net force on the object is

0 N

An apple weighs 1 N. When held at rest above your head, the net force on the apple is

0 N

0m/s

An object travels 5 m east in 6 s, stops for 3 s, and then travels 15 m west in 11 s. Its average speed for the entire trip was

1 m/s

If you drop an object, it will accelerate downward at a rate of 10 m/s/s. If you instead throw it downwards, its acceleration (in the absence of air resistance) will be

10 m/s/s.

How much work is done when a horizontal force of 25 N is applied through a distance of 4.0 m, if it took 5.0 s?

100 J

Determine the kinetic energy of a 20.0 kg bicycle that is moving with a speed of 10.0 m/s.

1000 J

A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is

1000 N

An object travels 5 m east in 6 s, stops for 3 s, and then travels 15 m west in 11 s. Its displacement was

10m west

If you drop an object, it will accelerate downward at a rate of 10 m/s/s. If you instead throw it downwards, its acceleration (in the absence of air resistance) will be

10m/s/s

A baseball is tossed upward with an initial velocity of +24 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is its velocity 1.0 second after release?

14m/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?

15 seconds

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?

1500 kg

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?

15sec

If a uniformly accelerating object travels 40 cm in 1 second, how far will it travel in 2 seconds?

160cm

An object travels 5 m east in 6 s, stops for 3 s, and then travels 15 m west in 11 s. Its average speed for the entire trip was

1m/s

Which takes more power - lifting a 10 lb sack of fertilizer 2 feet in 3 s, or lifting it 2 feet in 2 s?

2 feet in 2 s

Which takes more power - lifting a 10 lb sack of fertilizer 2 feet in 3 s, or lifting it 2 feet in 2 s?

2 feet in 2 sec

After the first bounce, the ball lost approximately ___________ of mechanical energy.

2.8 J

How much work is done in lifting a 1.0 kg mass a height of 2.0 m, if it took 2.0 s?

20 J

An object is released to fall freely through the air. What is its speed 2.0 seconds after release?

20 m/s

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.

200 J

Determine the kinetic energy of a 10.0 kg bicycle that is moving with a speed of 20.0 m/s.

2000 J

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?

2000 N

If a uniformly accelerating object travels 50 cm in 1 second, how far will it travel in 2 seconds?

200cm

An object travels 5 m east in 6 s, stops for 3 s, and then travels 15 m west in 11 s. Its displacement was

20m west

According to this "Energy vs Time" graph of a falling and bouncing ball, the total energy the ball had immediately before release was approximately

22 J

According to this "Energy vs Time" graph of a falling and bouncing ball, the total energy the ball had immediately before release was approximately _________.

22 J

An object travels 100 m east in 2 s, stops for 3 s, and then travels 150 m east in 5 s. Its average speed for the entire trip was

25m/s

An object travels 100 m east in 2 s, stops for 3 s, and then travels 150 m east in 5 s. The magnitude of its average velocity for the entire trip was

25m/s

A baseball is tossed upward with an initial velocity of +36 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is its velocity 1.0 second after release?

26 m/s

A vacationing family travels east in their car for 4 hours at an average speed of 50 mph, stops to visit a museum for 4 hours, and then travels west 2 more hours at an average speed of 40 mph. What was their average speed for the entire trip?

28mph

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?

3.0

A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this event is

3000 N

An object is released to fall freely through the air. What is its speed 3.0 seconds after release?

30m/s

36 m/s

36m/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 initial position of this object?

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 piece of rope is pulled by two people in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope?

400 N

A student with a mass of 50.0 kg runs up two flights of stairs in 8.0 sec. The student has gone a vertical distance of 8.0 m. Determine the amount of work done by the student to elevate her body to this height. Assume that her speed is constant.

4000 J

Lupert stands on a bridge overlooking the river below. He holds a rock over the water and releases it. Neglecting the effects of air resistance, how far did the rock fall if it takes 3.0 s to hit the water below?

45 m

If a uniformly accelerating object travels 50 cm in 1 second, how far will it travel in 3 seconds?

450cm

A student with a mass of 60.0 kg runs up two flights of stairs in 10.0 sec. The student has gone a vertical distance of 8.0 m. Determine the amount of work done by the student to elevate her body to this height. Assume that her speed is constant.

4800 J

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 5t + 4. What was the initial position of this object?

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?

4m/s

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 initial velocity of this object?

4m/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?

4m/s/s

An object is released to fall freely through the air. What is its speed 5.0 seconds after release?

50 m/s

A person is attracted toward the center of the Earth by a 500-N gravitational force. The Earth is attracted toward the person with a force of

500 N

A skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on the diver is then

500 N

Lupert stands on a bridge overlooking the river below. He holds a rock over the water and tosses it downward with a speed of 15 m/s. Neglecting the effects of air resistance, how far did the rock fall if it takes 2.0 s to hit the water below?

50m

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?

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?

5m/s

A 10-N falling object encounters 4 N of air resistance. The net force on the object is

6 N

A student with a mass of 80.0 kg runs up two flights of stairs in 10.0 sec. The student has gone a vertical distance of 8.0 m. Determine the amount of work done by the student to elevate his body to this height. Assume that his speed is constant.

6400 J

If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is

6km/h/s

Lupert stands on a bridge overlooking the river below. He holds a rock over the water and releases it. Neglecting the effects of air resistance, how far did the rock fall if it takes 4.0 s to hit the water below?

80m

An astronaut travels to a distant planet that has an acceleration due to gravity of 4.0 m/s/s. Assuming no air resistance, how fast will an object be traveling 3.0 s after being fired into the air with an initial speed of 20 m/s?

8m/s

Aristotle believed that the tendency of an object was to remain in its current state of motion.

False

The spring scales we use in our lab will also give an accurate measure of mass on the moon.

False

If one object has twice as much mass as another object, it also has twice as much

Inertia

The metric unit for work is

Joule

The metric unit for work is the ___________.

Joule

A skier follows the path shown in the picture above. What is the kinetic energy and potential energy at position B?

KE = 20,000 J; PE = 30,000 J

An object's weight may properly be expressed in units of

Newtons

T/F Aristotle believed that the natural state of an object was to be at rest in its "natural place."

True

T/F: Newton believed that the tendency of an object was to remain in its current state of motion.

True

The inertia balance we used in the lab will also give us an accurate measure of mass on the moon.

True

The spring scales we use in our lab will also give an accurate measure of weight on the moon.

True

A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the

Volkswagen

The metric unit for power is

Watt

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is

Zero

A bag of groceries has a mass of 10 kilograms and a weight of

about 100 N

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is

about 30 m/s.

If the mass of an object does not change, a constant net force on the object produces constant

acceleration

Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair - no wall, no tricks. You

agree that it can't be done

Which has zero acceleration? An object

all of these: at rest, moving at constant velocity, in mechanical equilibrium

A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is

almost equal to its weight.

An object that is moving to the right with a constant speed can be modeled pictorially by a series of dots that

are evenly spaced

An archer shoots an arrow. Consider the action force to be exerted by the bowstring against the arrow. The reaction to this force is the

arrow's push against the bowstring

Increasing the amplitude of a simple pendulum (i.e., pulling it back further before release) will cause its period to

be unchanged (take approximately the same time)

Increasing the mass of the pendulum bob (i.e., replacing the bob with a more massive one) will cause its period to

be unchanged (take approximately the same time)

Arnold Strongman and Suzie Small each pull very hard on opposite ends of a massless rope in a tug-of-war. The greater force on the rope is exerted by

both the same, interestingly enough

If no external forces are acting on a moving object it will

continue moving at the same velocity.

Objects that are slowing down in the positive direction have Distance vs Time graphs that

curve upward and get flatter

Objects that are speeding up in the positive direction have Distance vs Time graphs that

curve upward and get steeper

Decreasing the length of the simple pendulum (i.e., suspending the bob from a shorter string) will cause its period to

decrease (take less time)

You hold a ball motionless in your hand. The force of your hand pushing up on the ball is ________________ the force of the earth pulling down on the ball.

equal to

You hold an a ball motionless in your hand. The force of your hand pushing up on the ball is ________________ the force of the ball pushing down on your hand.

equal to

You hold an apple motionless in your hand. The force of your hand pushing up on the apple is ________________ the force of the apple pushing down on your hand.

equal to

You hold an apple motionless in your hand. The force of your hand pushing up on the apple is ________________ the force of the earth pulling down on the apple.

equal to

You stand on a weight scale in an elevator as it moves upward at a steady rate. The reading on the scale is

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

A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor

exactly below the midpoint of the ceiling.

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

follow a straight-line path

The Newton is a unit of

force

A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the

force that the ball exerts on the bat

A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the

force the glove exerts on the ball

A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the

force the glove exerts on the ball.

You hold a ball in your hand. As you toss it upward, the force of your hand pushing up on the ball is ________________ the force of the earth pulling down on the ball.

greater than

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

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

Increasing the length of the simple pendulum (i.e., suspending the bob from a longer string) will cause its period to

increase (take more time)

An object is tossed upward. As it falls back down, its kinetic energy ____________ and its gravitational potential energy ____________.

increases, increases

When the mass of a moving object is doubled, its kinetic energy...

is doubled

A negative velocity implies that an object:

is moving in the negative direction.

A positive velocity implies that an object

is moving in the positive direction.

When the speed of a moving object is doubled, its kinetic energy...

is quadrupled

Whenever the net force on an object is zero, its acceleration

is zero

Compared to the weight of an object on the earth, its weight on the moon is

less than on the earth, but greater than zero.

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

less than your "normal" weight because there is a net downward 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

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

To double the period of any particular pendulum, you must...

make the length four times as long.

A kilogram is a measure of an object's

mass

The object represented by this Position vs Time graph was

moving with a negative velocity.

The object represented by this Position vs Time graph was

moving with a positive velocity.

Compared to the weight of a certain object on Earth, the weight of the same object on the moon is

one sixth as much

As a ball falls, the action force is the pull of the Earth's mass on the ball. The reaction force is the

pull of the ball's mass on the Earth.

Joe pushes Bill, who is asleep. Bill

pushes Joe equally hard even without waking up.

Describe the motion represented by this Distance vs Time graph.

slowing down while moving in the negative direction

The faster an object travels, the ____________________ its "Distance vs Time" graph will be.

steeper

Your weight is

the gravitational attraction between you and the earth

Strange as it may seem, it is just as hard to accelerate a car on a level surface on the moon as it is here on the Earth. This is because

the mass of the car is independent of gravity.

If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity,

the object accelerates in the direction of the applied force.

If less horizontal force is applied to a sliding object than is needed to maintain a constant velocity,

the object eventually slides to a stop.

A car and a much heavier truck collide. The car is moving much faster than the heavier truck when they collide. Each puts a force on the other one. The force of the truck on the car is ___________ the force of the car on the truck.

the same as

A car and a much heavier truck collide. The heavier truck is moving much faster than the car when they collide. Each puts a force on the other one. The force of the car on the truck is ___________ the force of the truck on the car.

the same as

A car and a much heavier truck collide. They are both moving at the same speed when they collide. Each puts a force on the other one. The force of the truck on the car is ___________ the force of the car on the truck.

the same as

A small car breaks down out on the road and receives a push back to town by a large truck. While the truck, still pushing the car, is speeding up to get to cruising speed, the force of the truck on the car is __________________ to the force of the car on the truck.

the same as

Compared to the mass of an object on the earth, its mass in outer space where there is no net influence of gravity is

the same as on the earth

Compared to the mass of an object on the earth, its mass on the moon is

the same as on the earth

Compared to the mass of an object on the earth, its mass in outer space where there is no net influence of gravity is

the same as on the earth.

A automobile and a baby carriage traveling at the same speed collide head-on. The impact force is

the same for both

A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is

the same for both

The Earth pulls on the moon. Similarly the moon pulls on the Earth, evidence that

these two pulls comprise an action-reaction pair.

Timing errors may be minimized when determining an oscillation period by .....

using multiple timers. making multiple trials. timing multiple oscillations. ALL OF THESE

A negative acceleration implies that an object's

velocity is decreasing

A negative acceleration implies that an object's

velocity is decreasing.

A positive acceleration implies that an object's

velocity is increasing.

The position and time data in this table represent an object that was

was moving to the right at constant speed.

An object that starts at the origin and moves with a constant velocity of -5 m/s can be modeled mathematically by which equation?

x(t) = -5t

An object that starts at the 5 m position and moves with a constant velocity of 1 m/s can be modeled mathematically by which equation?

x(t) = t + 5

Compared to the weight of an object on the earth, its weight in outer space where there is no net influence of gravity is

Physics - Ball State - Joel Bryan - Midterm

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