PHY 101: Exam 1 Quiz Questions Review

consider a mass of 1 kg accelerated 1 m/s/s by a force of 1 N. find the acceleration for a force of 2 N acting on 2 kg

1 m/s/s

A grocery bag can withstand 300 N of force before it rips apart. How many kilograms of apples can it safely hold?

30.6 kg

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? a. 800N b. 600 N c. 400 N d. zero N e. none of these

400 N

consider a 32 kg block of cement that is pulled sideways with a net force of 170 N. find it's acceleration

5.3 m/s/s

if a car increases its velocity from 0 to 60 m/s in 10 seconds, its acceleration is.. a. 3m/s^2 b. 6m/s^2 c. 60 m/s^2 d. 600 m/s^2

6 m/s^2

What is the magnitude of the net force acting on a 1- kg ball in free fall?

9.80 N

If a freely falling object were equipped with a speedometer, its speed reading would increase each second by about a. 10 m/s b. 15 m/s c. 5 m/s d. depends on its initial speed e. a variable amount

a. 10 m/s

A horse gallops a distance of 10 kilometers in a time of 30 minutes. Its average speed is a. 20 km/h. b. 30 km/h. c. 40 km/h. d. 15 km/h.

a. 20 km/h.

Two equal-size vectors at right angles to each other have a resultant that is a. 2^(1/2) the length of either vector b. equal to that of either vector c. twice the length of either vector

a. 2^(1/2) the length of either vector

A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is a. 300 N upward b. 800 N downward c. 500 N downward d. 300 N downward c. 500 N upward

a. 300 N upward

facts in the field of science a. are changeable b. are more important that theories c. mean very little d. are absolute

a. are changeable

A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is less than 90°, their resultant is a. greater b. the same c. less

a. greater

A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. Acceleration will be greater for the a. lighter car b. same on each c. heavier car

a. lighter car

inertia is defined as a.. a. property of matter b. force c. change in motion d. none of the above

a. property of matter

A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to a state of zero acceleration first? a. the light woman b. the heavy man c. both should arrive at the same time d. not enough information

a. the light woman

The attraction of a person's body toward Earth is called weight. The reaction to this force is a. the person's body pulling on the Earth b. the person's body pushing against Earth's surface c. the Earth's surface pushing against the person's body d. none of these

a. the persons body pulling on the Earth

A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about a. the same. b. twice as much. c. half as much. d. four times as much.

a. the same

A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is a. the same for both b. greater on the car c. greater on the bug

a. the same for both

The force of friction on a sliding object is 10 newtons. The applied force needed to maintain a constant velocity is a. less than 10 N b. 10 N c. more than 10 N

b. 10 N

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

b. 15 seconds

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 a. 1500 N b. 3000N c. zero d. 6000N

b. 3000N

Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration in meters per second per second? a. 2.8 b. 4.0 c. 0.25 d. 10 e. 40

b. 4.0 m/s/s

A 10-N falling object encounters 4 N of air resistance. The net force on the object is a. 0 N b. 6 N c. 4 N d. 10 N e. none of these

b. 6 N

A block is dragged without acceleration in a straight-line path across a level surface by a force of 6 N. What is the force of friction between the block and the surface? a. less than 6 N b. 6 N c. more than 6N d. need more information

b. 6 N

if you double the net force of an object, you'll double its a. speed b. acceleration c. velocity d. all of the above

b. acceleration

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the a. air resistance against the bow b. arrow's push against the bowstring c. grip of the archer's hand on the bow d. combined weight of the arrow and bowstring e. friction of the ground against the archer's feet

b. arrow's push against the bowstring

If an object moves with constant acceleration, its velocity must a. be constant also. b. change by the same amount each second. c. change by varying d. amounts depending on its speed. e. always decrease.

b. change by the same amount each second

Your car is coasting on level ground at 60 km/h and you apply the brakes until the car slows to 40 km/h. If you suddenly release the brakes now, the car tends to a. momentarily regain its higher initial speed b. continue moving at 40 km/h c. decrease in speed if no other forces act

b. continue moving at 40km/h

Katelyn runs along the aisle of a train that moves at 8 m/s. Her speed relative to the floor is 3 m/s. Her speed relative to an observer at rest on the ground is a. 5 m/s b. either depending on her running direction c. 11 m/s d. none of the above

b. either depending on her running direction

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 a. ahead of the midpoint of the ceiling. b. exactly below the midpoint of the ceiling. c. behind the midpoint of the ceiling. d. More information is needed to solve this problem. none of these

b. exactly below the midpoint of the ceiling

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 a. air resistance on the ball b. force that the ball exerts on the bat c. weight of the ball d. grip of the player's hand against the ball e. weight of the bat

b. force that the ball exerts on the bat

A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is greater than 90°, their resultant is a. greater b. less c. the same

b. less

A ball is thrown vertically into the air. Because of air resistance, its time coming down compared to its time going up is a. the same b. more c. less

b. more

When Nellie hangs suspended from a pair of ropes that are not vertical, the tension in each rope is a. half her weight b. more than half her weight c. less than half her weight d. her weight

b. more than half her weight

When a rocket ship accelerating in outer space runs out of fuel, it a. accelerates for a short time, slows down, and eventually stops. b. no longer accelerates. c. accelerates for a short time, then slows down to a constant velocity.

b. no longer accelerates

The force due to gravity that acts on a block of ice that slides down an icy ramp a. becomes greatest when the ramp is vertical b. remains equal to mg at all angles c. decreases as the slope of the ramp increase

b. remains equal to mg at all angles

A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. The spring exerts the greater force on the a. lighter car b. same on each c. heavier car

b. same on each

your weight as measured on your bathroom scale is a. a property of mechanical equilibrium b. the force due to gravity on you c. equal to your mass d. all of the above

b. the force due to gravity on you

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 a. the weight of the car is independent of gravity b. the mass of the car is independent of gravity c. nonsense! a car is much more easily accelerated on the moon than on the earth

b. the mass of the car is independent of gravity

An automobile and a golf cart traveling at the same speed collide head-on. The impact force is a. greater for golf cart b. same for both c. greater for automobile

b. the same for both

A rock weighs 30 N on Earth. A second rock weighs 30 N on the moon. Which of the two rocks has the greater mass? a. one on the moon b. they have the same mass c. the one on earth d. not enough information to say

b. they have the same mass

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

b. zero

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second per second is a. infinite b. 9.8 m/s/s c. 0 d. 4.9 e. none of these

c. 0

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is a. less than 10 N b. more than 10 N c. 10 N

c. 10 N

If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about a. 10 seconds. b. 1 second. c. 2 seconds. d. 20 seconds. e. not enough information to estimate

c. 2 seconds

If a freely falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s/s, then its speed reading would increase each second by a. 0 m/s. b. 30 m/s. c. 20 m/s. d. 10 m/s. e. depends on its initial speed

c. 30 m/s

A skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on the diver is then a. 90 N b. 410 N c. 500 N d. 250 N

c. 500 N

Hang from a pair of gym rings and the upward support forces of the rings will always a. each be half your weight b. each equal your weight c. add up to equal your weight

c. add up to equal your weight

When you stand at rest on a pair of bathroom scales, the readings on the scales will always a. each be half your weight b. each equal your weight c. add up to equal your weight

c. add up to equal your weight

As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the a. acceleration of the ball b. air resistance acting against the ball c. ball's pull on earth d. none of the above

c. ball's pull on earth

When a falling object has reached its terminal velocity, its acceleration is a. g b. 0 c. constant

c. constant

A heavy block at rest is suspended by a vertical rope. When the block is accelerated upward by the rope, the rope tension a. remains the same b. decreases c. increases

c. increases

Twelve seconds after starting from rest, an object falling freely will have a speed of a. 50 m/s. b. 10 m/s. c. more than 100 m/s. d. 100 m/s.

c. more than 100 m/s

Two factors that greatly affect air resistance on falling objects are the a. size and weight of the object b. size and mass of the object c. size and speed of the object

c. size and speed of the object

when no forces act on moving objects their paths are normally? a. circles b. ellipses c. straight lines d. all of the above

c. straight lines

two students engaged in a tug of war each pull a rope in opposite directions with a force of 400 N. the net force on the rope is.. a. 400 N and rope tension is 400N b. 400 N and rope tension is 800 N c. zero and rope tension is 400N d. zero and rope tension is 800N

c. zero and rope tension is 400N

An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration in meters per second per second is approximately a. 5. b. 8. c. 24. d. 0.

d. 0

A piece of rope is pulled by two people in a tug-of-war. Each exerts a 400-N force. What is the tension in the rope? a. zero b. 800 N c. 600 N d. 400 N e. none of the above

d. 400 N

a truly educated person is knowledgeable about a. religion b. science c. art d. all of the above

d. all of the above

an object in mechanical equilibrium is an object a. having no acceleration b. at rest c. moving with constant velocity d. all of these

d. all of these

whereas Aristotle relied on logic in explaining nature, galileo relied on a. logic also b. patterns c. math d. experiment

d. experiment

the newton is a unit of a. inertia b. mass c. density d. force

d. force

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be a. doubled. b. constant. c. less and less each second. d. greater than the second before.

d. greater than the second before

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. resistance b. acceleration c. gravity d. inertia

d. inertia

Three kids pull on a toy. Kim pulls with a force of 30 N north, Jim pulls with a force of 30 N south, and Tim pulls with a force of 15 N east. The acceleration of the toy is a. 33 m/s/s b. 10 m/s/s c. 15 m/s/s d. need more information

d. need more information

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is a. equal to its weight. b. equal to its weight divided by its mass. c. equal to the product of its mass times its weight. d. zero.

d. zero

A skydiver falls towards the Earth. The attraction of the Earth on the diver pulls the diver down. What is the reaction to this force? a. water resistance that will soon act upward on the diver b. the attraction of the planets, stars, and every particle in the universe c. air resistance the diver encounters while falling d. all of these e. none of these

e. none of these

A skydiver's terminal velocity will be greatest if she falls a. with her parachute open b. head first c. lying flat on her stomach d. lying flat on her back

head first