Physical Science 235 Alicia Courville

What is the acceleration of a car that maintains a constant velocity of 100km/h for 10 s? A) 0m/s^2 B) 10km/h/s C) 10m/s^2 D) 1000km/h/s

A) 0m/s^2

A rock is thrown vertically into the air. At the top of its path, its acceleration in meters per second per second is about A) 10 B) between 0 and 10 C) 0 D) greater than 10 E) none of these

A) 10

If a freely falling object were somehow equipped with a speedometer, its spread reading would increase each second by about... A) 10m/s B) 5m/s C) 15m/s D) a variable amount E) depends on its initial speed

A) 10m/s

The gain in speed each second for a freely falling object is about A) 10m/s B) 0 C) 20m/s D) 5m/s E) depends on the initial speed

A) 10m/s

If you drop and object, it will accelerate downward at a rate of about 10m/s/s. If you instead throw it downwards, its acceleration (in the absence of air resistance) will be A) 10m/s/s B) greater than 10m/s/s C) less than 10m/s/s

A) 10m/s/s

A car traveling at 22m/s comes to an abrupt halt in 0.1 s when it hits a tree. What is the deceleration in meters per second per second of the car? A) 220 B) 880 C) 800 D) 110 E) can't be solved without the mass of the car

A) 220

A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is A) 3000 N B) 300 N C) 30 N D) more than 3000 N

A) 3000 N

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both sides. The reading on each scale is... A) 400 N B) 1600 N C) 800 N D) 200 N E) none of the above

A) 400 N

Which has greater mass? A) Automobile battery B) king size pillow C) both about the same

A) Automobile battery

When you stand at rest on a pair of bathroom scales, the readings on the scales will always A) add to equal your weight B) each equal your weight C) each be half your weight

A) add to equal your weight

Hang from a pair of gym rings and the upward support forces of the rings will always A) add up to equal your weight B) each be equal to your weight C) each be half your weight

A) add up to equal your weight

If a non-rotating object has no acceleration then we can say for certain that it is A) in mechanical equilibrium B) moving at constant nonzero velocity C) at rest D) all of the above E) none of the above

A) in mechanical equilibrium

In each second of fall, the distance a freely falling object will fall is A) increasing B) about 5 m C) the same, but not 5 m or 10 m D) about 10 m E) none of these

A) increasing

Whenever the net force on an object is zero, its acceleration A) is zero B) may be zero

A) is zero

A kilogram is a measure of an object's A) mass B) gravity C) force D) weight E) center of mass

A) mass

The force exerted on the tires of a car directly accelerate it along a road is exerted by the A) road B) tires C) air D) engine E) none of these

A) road

Compared with the mass of a certain object on Earth, the mass of the same object on the moon is... A) the same B) less C) more

A) the same

If you push a crate across a level floor at constant speed, the friction between the crate and the floor is A) the same amount as your pushing force B) a but more than your pushing force C) a but less than your pushing force D) none of these

A) the same amount as your pushing force

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is... A) more than 10 N B) 10 N C) less than 10 N

B) 10 N

A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push with A) one-tenth the amount of force B) 10 times as much force C) just as much force D) 100 times as much force E) none of these

B) 10 times as much force

The scientist to first introduce the concept of inertia was A) Copernicus B) Galileo C) Aristotle D) Newton

B) Galileo

When a rifle is fired, it recoils so both the bullet and rifle are set in motion. The rifle and bullet ideally acquire equal A) amounts of kinetic energy B) but opposite amounts of momentum C) both of these D) none of these

B) but opposite amounts of momentum

Bullets are fired from an airplane in the forward direction of motion. The momentum of the airplane will be A) increased B) decreased C) unchanged

B) decreased

Whereas Aristotle relied on logic in explaining nature, Galileo relied on A) patterns B) experiment C) logic also D) mathematics

B) experiment

A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared to the force that stops the car, the force needed to stop the truck is A) smaller B) greater C) the same

B) greater

One object that has twice as much mass as another object also has twice as much A) volume B) inertia C) gravitational acceleration D) velocity E) all of the above

B) inertia

As a ball falls, the action force is the pull of the Earth's mass on the ball. The reaction force is the A) acceleration of the ball B) pull of the ball's mass on the Earth C) air resistance acting against the ball D) nonexistent in this case E) none of these

B) pull of the ball's mass on the Earth

An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass? A) the one on Earth B) the one on the moon C) they have the same mass D) not enough information to say

B) the one on the moon

As an object freely falls, its A) acceleration increases B) velocity increases C) both of the above D) none of the above

B) velocity increases

An apple weighs 1 N. When held at rest above your head, the net force on the apple is A) 1 N B) 10 N C) 0 N D) 0.1 N E) none of these

C) 0 N

A 1-kg mass at the Earth's surface weighs about A) 5 N B) 12 N C) 10 N D) 1 N E) none of these

C) 10 N

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is A) the same as the force on the 1-kg book B) zero C) 10 times as much as the force on the 1-kg book

C) 10 times as much as the force on the 1-kg book

The average speed of a horse that gallops a distance of 10 km in a time of 30 min is A) 10km/h B) 30km/h C) 20km/h D) more than 30km/h

C) 20km/h

If a baseball being thrown goes from zero to 30m/s in 0.1 second, what is its average acceleration? A) 3000 m/s/s B) 3 m/s/s C) 300 m/s/s D) 30 m/s/s E) none of these

C) 300 m/s/s

A car accelerates from rest at 2m/s/s. What is its speed 3s after the car starts moving? A) 3m/s B) 2m/s C) 6m/s D) 4m/s E) none of these

C) 6m/s

In which case would you have the largest mass of gold? If your chuck of gold weighed 1 N on the A) planet Jupiter B) Earth C) Moon

C) Moon

Which of the following has the largest momentum relative to the Earth? A) a tightrope walker crossing Niagara Falls B) the Science building on campus C) a pickup truck speeding along a highway D) a dog running down the street E) a Mack truck parked in a parking lot

C) a pickup truck speeding along a highway

The amount of friction that occurs when two material surfaces slide against each other depends on.. A) the stickiness of atoms on their surfaces B) how much they are pressed together C) both of these D) none of these

C) both of these

A mack truck and a Volkswagen traveling at the same speed collide head-on. The impact force is greatest on the A) Volkswagen B) Mack truck C) is the same for both

C) is the same for both

A force is a vector quantity because it has both A) mass and acceleration B) action and reaction counterparts C) magnitude and direction

C) magnitude and direction

Your weight is A) a property of mechanical equilibrium B) actually your mass C) the gravitational attraction between you and the Earth D) the same in all locations

C) the gravitational attraction between you and the Earth

An object is pulled northward with a force of 10 N and southward with a force of 15 N. The magnitude of the net force on the object is A) 15 N B) 0 N C) 10 N D) 5 N E) none of the above

D) 5 N

An object in mechanical equilibrium is an object... A) moving with constant velocity B) having no acceleration C) at rest D) all of the above

D) all of the above

Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much A) volume B) mass C) inertia D) all of the above E) none of the above

D) all of the above

Which has zero acceleration? An object... A) in mechanical equilibrium B) at rest C) moving at constant velocity D) all of the above E) none of the above

D) all of the above

The resistive force of friction occurs for A) gases B) solids C) liquids D) all of these

D) all of these

Strictly speaking, if any electrical device in your car is turned on (such as an air conditioner, headlights, or even a radio), more gasoline is burned by the engine. This statement is A) true only if the car's engine is running B) totally false C) true only if the car's engine is running D) always true E) none of these

D) always true

The two measurements necessary for calculating average speed are A) distance and acceleration B) velocity and distance C) acceleration and time D) distance and time E) velocity and time

D) distance and time

A 1-kg glider and a 2-kg glider both slide toward each other at 1m/s on an air track. They collide and stick. The combined mass moves at A) 1/6 m/s B) 1.5 m/s C) 0 m/s D) 1/2 m/s E) 1/3 m/s

E) 1/3 m/s

A 1-kg ball is thrown at 10m/s straight upward. Neglecting air resistance, the net force that acts on the ball when it is halfway to the top of its path is about A) 1 N B) 5 N C) 1/2 N D) 7.5 N E) 10 N

E) 10 N

A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is A) 500 N upward B) 500 N downward C) 300 N downward D) 800 N downward E) 300 N upward

E) 300 N upward

A sandbag is motionless in outer space. A second sandbag with 3 times the mass moving at 12m/s collides with it and they both stick together, and move at a speed of A) 8m/s B) 6m/s C) 3m/s D) 4m/s E) none of these

E) none of these

Compared with a 1-kg block of solid iron, a 2-kg block of iron has the same A) volume B) weight C) mass D) all of these E) none of these

E) none of these