Unit 2 Exam - Craig Fisher | Laabri | Nneɛma a ɛma wotumi yɛ ade

Answer the questions by clicking on the correct answer. You will have ONE class period in which to complete this exam.

2

Which of the following most closely illustrates motion by relating it to a reference point?

A. the hands of a clock relative to the numbers on a clock

B. the distance a race car traveled relative to the time of travel

C. the speed of a bicycle relative to the direction of travel

D. the velocity change of a train realtive to time

2

Which of the following are two factors that determine speed?

A. acceleration and time

B. velocity and time

C. distance and time

D. motion and time

2

Which of the following explains the difference between speed and velocity?

A. Velocity has motion and speed does not.

B. Velocity has direction and speed does not.

C. Velocity involves time and speed does not.

D. Velocity involves acceleration and speed does not.

2

Which of the following best represents acceleration as presented on a graph?

A. motion change vs. time

B. distance change vs. time

C. speed change vs. time

D. velocity change vs. time

2

Which of the following choices best represents force?

A. a push or a pull always causing motion

B. a push or a pull always causing acceleration

C. a push or a pull acting without an object

D. a push or a pull acting on an object

2

Which of the following best determines the net force when more than one force is acting on an object?

A. a combination of all motions of an object

B. a combination of all motions of an object in two directions

C. a combination of all forces acting on an object

D. a combination of all forces acting on an object in two directions

2

When the net forces equal 0 N, they are which of the following?

A. balanced

B. unbalanced

C. a push

D. a pull

2

Which of the following always causes a change in speed, direction or both?

A. balanced forces

B. unbalanced forces

C. either balanced or unbalanced forces

D. any combination of forces

2

What is force that opposes motion between two surfaces that are in contact?

A. friction

B. motion

C. velocity

D. acceleration

2

Which are the two factors that determine the amount of friction?

A. the force and the roughness of the surfaces

B. hills and valleys and the roughness of the surfaces

C. the force and how much surfaces come in contact

D. the force and the weight exerted on the surfaces

2

Which of these is opposed by kinetic friction?

A. a book sitting on a table

B. a cat standing in a yard

C. a box sliding on a floor

D. a child leaning on a building

2

Which of these is opposed by static friction?

A. a pencil rolling on a table

B. a dog running in a yard

C. a chair sliding on a floor

D. a worker pushing on a non-moving box

2

In which of the following activities is friction helpful?

A. engine parts wearing out

B. car tires moving a car forward

C. soil erosion

D. holes developing in your socks

2

In which of the following activities is friction harmful?

A. brakes stopping a car

B. a person walking

C. an eraser erasing

D. car engine parts wearing out

2

Which would NOT be a way to reduce friction?

A. using ball bearings

B. using sandpaper to smooth a surface

C. pouring sand on ice

D. lubricating with oil

2

All matter has mass,

A. but small amounts of mass are unaffected by gravity.

B. and all mass is affected by gravity.

C. but only the Earth's gravity affects matter.

D. but only the Earth's and sun's gravity affects matter.

2

As the distance between two objects increases, the force of gravity between them

A. decreases.

B. does not change.

C. increases only slightly.

D. increases greatly.

2

Which of the following does NOT describe weight?

A. changes as gravitational force changes

B. is constant

C. is a measure of gravitational force

D. can be measured in newtons

2

What is an object that appears to stay in place and that helps you detect motion in another object?

A. a newton

B. a lubricant

C. a singularity

D. a reference point

2

To calculate an object's average acceleration, you need to know

A. starting velocity, distance traveled and speed.

B. starting point, end point and the object's mass.

C. starting velocity, final velocity and the time it takes to change velocity.

D. average speed, distance and the time it takes to change velocity.

2

The gravitational force is greater between two objects that

A. have greater masses.

B. have rougher surfaces.

C. are farther apart.

D. are moving at greater speed.

2

What is the net force on an object when you combine a force of 10 N north with a force of 5 N south?

A. 5 N south

B. 15 N north

C. 50 N north

D. 5 N north

2

Mass is

A. different on the moon than on Earth.

B. a measure of gravitational force.

C. a measure of the amount of matter present.

D. measured in newtons.

2

Dividing the total distance traveled by the total time is how to calculate

A. average speed.

B. average velocity.

C. average acceleration.

D. average motion.

2

If a baseball and a cannonball are dropped from the same height at the same time, and there is no air resistance, which ball will hit the ground first?

A. The cannonball lands first.

B. The baseball lands first.

C. The balls land at the same time.

D. The ball with the larger volume lands first.

2

What feature of an object does NOT affect air resistance?

A. its size

B. its chemical properties

C. its shape

D. its speed

2

Why do astronauts in space appear weightless?

A. There is no gravity in space.

B. Air resistance opposes gravity.

C. They have no mass in space.

D. They are in free fall.

2

In what direction(s) is(are) a projectile accelerated?

A. both vertically and horizontally

B. vertically downward

C. vertically upward

D. horizontally forward

2

The reaction force of the stool that you are sitting on

A. is greater than your weight.

B. is equal to your weight.

C. is determined by many factors.

D. varies.

2

Which of the following is the equation for Newton's second law of motion?

A. F = m x a

B. m = F x a

C. a = m x F

D. F = m/a

2

When a train increases its velocity, its momentum

A. decreases.

B. remains unchanged.

C. increases.

D. is transferred to its surroundings.

2

A car with a mass of 1400 kg moves along the ice with a constant velocity of 18.0 m/s. What is the car's momentum?

A. 77.8 N

B. 25,200 N

C. 77.8 kg*m/s

D. 25,200 kg*m/s

2

When a bowling ball collides with a bowling pin,

A. the momentum of both the pin and the ball increases.

B. the momentum transfers from the ball to the pin.

C. the momentum of both the pin and the ball decreases.

D. the momentum of both the pin and the ball does not change.

2

If an action force is a cue ball hitting a billiard ball, then the reaction force is

A. exerted on the table.

B. exerted on all the other billiard balls.

C. not present.

D. exerted by the billiard ball on the cue ball.

2

Which of the following is NOT an example of projectile motion?

A. the path of a leaping frog

B. the path of an arrow through the air

C. the path of a crate sliding along flat ground

D. the path of a pitched baseball

2

Which of the following objects has the least acceleration?

A. an empty shopping cart pushed with a hard force

B. a full shopping cart pushed with a hard force

C. an empty shopping cart pushed with a light force

D. a full shopping cart pushed with a light force

2

When a moving bumper car collides with a bumper car at rest, which of the following occurs?

A. Momentum is transferred to the car at rest.

B. Momentum is transferred to the ground beneath the cars.

C. Momentum is transferred to the moving car.

D. There is no transfer of momentum.

2

A crumpled piece of paper hits the ground before a flat sheet of paper because

A. the acceleration due to gravity is greater on the crumpled piece of paper.

B. there is more air resistance against the flat paper.

C. the crumpled paper is more massive.

D. the crumpled paper is less massive.

2

Assuming 1 kg = 1000 g, a 5 kg object has less inertia than an object with a mass of

A. 4 kg.

B. 6,000 g.

C. 2 kg.

D. 1,500 g.

2

According to Newton's First Law of Motion, a moving object that is not acted on by an unbalanced force will

A. remain in motion.

B. eventually come to a stop.

C. change its momentum.

D. accelerate.

2

A cue ball rolls toward a billiard ball with a velocity of 1.0 m/s east. Both balls have identical masses. What happens to the total momentum after the two balls collide?

A. It is greater than the original momentum of the cue ball.

B. It is equal to the momentum before the collision.

C. It is less than the original momentum of the cue ball.

D. It is equal to zero.

2

Which of the following is NOT an action/reaction force pair?

A. the forces between a bat and a ball.

B. the attractive force between a falling ball and the Earth.

C. the force of thrust and the force of gravity acting on an airplane.

D. the forces between a grasshopper and the ground.

2

An ice skater with a mass of 65 kg moves along the ice with a constant velocity of 2.0 m/s. What is the ice skater's momentum?

A. 130 kg*m/s

B. 32 kg*m/s

C. 130 N

D. 32 N

2

Why does a ball that is thrown horizontally follow a path that is curved downward?

A. There is no acceleration on the ball.

B. The ball is accelerated in the horizontal direction only.

C. The ball is accelerated by gravity in the vertical direction only.

D. The ball is accelerated in both the horizontal and vertical directions.

2

If three balls made of steel, rubber and plastic were dropped at the same time from the same height, which would hit the ground first assuming no air resistance?

A. All would hit at the same time.

B. The rubber ball would hit first.

C. The steel ball would hit first.

D. The plastic ball would hit first.

2

A spacecraft orbiting the Earth is both moving forward and

A. at terminal velocity.

B. in free fall.

C. experiencing air resistance.

D. weightless.

2

Newton's first law of motion states that a moving object, unless it is acted on by an unbalanced force, will

A. remain in motion.

B. eventually come to a stop.

C. change its momentum.

D. accelerate.

2

An astronaut uses a jet of nitrogen to maneuver in space. This can be done because of

A. orbiting.

B. free fall.

C. momentum conservation.

D. inertia.

2

A book weighs 6 N. If the acceleration due to gravity is 9.8 m/s2, what is the mass of the book in kg?

A. 6.1 kg

B. 59 kg

C. 1.6 kg

D. 0.61 kg

2

A falling object's terminal velocity is reached when the force of gravity

A. is greater than the force of air resistance.

B. is less than the force of air resistance.

C. is equal to the force of air resistance.

D. is the only force acting on the object.

2

What is the S.I. unit for pressure called?

A. pound

B. meter

C. pascal

D. calorie

2

Why doesn't ice float in air?

A. Water is denser than air.

B. Air is denser than ice.

C. Ice is denser than air.

D. Air has more pressure.

2

How does atmospheric pressure change as you go from the top of a mountain to sea level?

A. The pressure decreases.

B. The pressure stays the same.

C. The pressure almost equals zero.

D. The pressure increases.

2

Upon what does a soap bubble's shape depend?

A. even air pressure

B. neutral force

C. gravity

D. uneven air pressure

2

Which of the following does NOT affect an airplane's lift?

A. turbulence

B. air quality

C. wing size

D. speed

2

In which of the following locations would the atmospheric pressure be greatest?

A. at sea level

B. on a mountaintop

C. at the altitude at which planes fly

D. at the outer edge of the atmosphere

2

When a fluid flows from area A to area B, area A is an area of greater

A. pressure.

B. mass.

C. volume.

D. temperature.

2

Why do air bubbles in water rise to the surface?

A. Liquids cannot be compressed very much.

B. Water is about 1000 times denser than air.

C. pressure is the amount of force exerted over a given area.

D. The weight of the atmosphere pushes down on the water.

2

Because fluid pressure is exerted evenly in all directions,

A. some objects float.

B. birds and airplanes can fly.

C. bubbles are round.

D. objects seem to weigh less in water.

2

Which of the following does NOT affect the amount of lift on an airplane's wing?

A. turbulence

B. gravity

C. wing surface area

D. the airplane's speed

2

Which of the following would NOT affect the level at which a ship cruises at sea?

A. the depth of the ocean

B. the shape of the ship

C. the mass of the ship's contents

D. the density of the ships materials

2

Which of the following statements about fluids is NOT true?

A. All can flow.

B. Some take the shape of their container.

C. Liquids and gases are included.

D. Molecules move easily past each other.

2

When air is pumped into a tire,

A. the force per unit area increases.

B. the number of pascals decreases.

C. the air molecules slow down.

D. the air takes up less space.

2

Water pressure

A. decreases with depth.

B. is about twice as much on a diver at 10 m as at the surface.

C. is less than air pressure for the same volume of air and water.

D. is unaffected by atmospheric pressure.

2

Which of the following is affected by an airplane's speed?

A. buoyancy

B. gravity

C. air quality

D. lift

2

Which of the following would NOT affect the level at which a canoe floats in a body of water?

A. depth of the water

B. number of people in the canoe

C. shape of the canoe

D. density of the canoe's material

2

Why would a pilot adjust a plane's wing flaps?

A. to reduce cabin pressure

B. to increase drag

C. to reduce drag

D. to increase cabin pressure

2

Which of the following substances is less dense than air?

A. water

B. helium

C. ice

D. gold

2

What is the equation for pressure?

A. pressure = area/force

B. pressure = force/area

C. pressure = mass/volume

D. pressure = volume/mass

2

When you exhale, what happens in the lungs?

A. Air moves from high pressure (in the lungs) to low pressure (outside).

B. Lung pressure decreases.

C. Space in your lungs increases.

D. Air moves from low pressure (in the lungs) to high pressure (outside).

2

Pressure exerted on a diver 10 m underwater is

A. one-third the pressure at the surface.

B. 100 times the pressure at the surface.

C. 1,000 times the pressure at the surface.

D. twice the pressure at the surface.

1

What causes air to rush into a tornado?

A. The air pressure is higher inside the tornado than outside.

B. The air pressure is lower outside the tornado than inside.

C. The air pressure is lower inside the tornado than outside.

D. the air pressure is the same inside and outside the tornado.

2

What happens in the lungs when you exhale?

A. Air moves from low pressure (outside) to high pressure (in the lungs).

B. Lung pressure decreases.

C. Oxygen comes into the lungs?

D. Air moves from high pressure (in the lungs) to low pressure (outside).

2

In which 10 km interval does air pressure change the most?

A. 0 to 10

B. 10 to 20

C. 40 to 50

D. 90 to 100

2

What conclusion can you draw from this graph?

A. As you decrease the atmospheric pressure, the altitude increases.

B. Atmospheric pressure changes at the same rate as you go up in the atmosphere.

C. As you move higher into the atmosphere, the atmospheric pressure decreases.

D. Atmospheric pressure increases with altitude.

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