Physics Units 3 & 4 Concept Quizzes

A projectile is fired into the air at an angle of 50 degrees with the ground and lands on a target that is at the same level at which the projectile started. It will also land on the target if it is fired at an angle of a 40 degrees. b 60 degrees. c 55 degrees. d 45 degrees. e none of these

a 40 degrees.

A projectile is launched vertically upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is a 50 m/s. b zero c less than 50 m/s. d more than 50 m/s.

a 50 m/s.

According to Newton's law of inertia, a railroad train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains a always have forces that oppose their motion. b move too slowly. c must go up and down hills. d are much too heavy.

a always have forces that oppose their motion.

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

a arrow's push against the bowstring.

If no external forces are acting on a moving object, it will a continue moving at the same velocity. b move slower and slower until it finally stops. c continue moving at the same speed. d impossible to way without more information

a continue moving at the same velocity.

The relationship between force and acceleration is a direct linear. b inverse linear. c direct quadratic. d inverse quadratic.

a direct linear.

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

a mass.

The path of a projectile through space is called its: a trajectory b equilibrant c range d torque

a trajectory

An object is dropped and freely falls to the ground with an acceleration of 1 g. If it is thrown upward at an angle instead, its acceleration will be a 0 g. b 1 g downward. c larger than 1 g. d 1 g upward. e none of these

b 1 g downward.

A plane flying horizontally at a speed of 50.0 m/s and at an elevation of 160 m drops a package. Two seconds later it drops a second package. How far apart will the two packages land on the ground? a 162 m b 100 m c 283 m d 177 m

b 100 m

A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is a less than 1000 N. b 1000 N. c more than 1000 N. d impossible to determine.

b 1000 N.

A hammer drives a nail into a piece of wood. Identify an action-reaction pair in this situation. a The nail exerts a force on the hammer; the hammer exerts a force on the wood. b The hammer exerts a force on the nail; the wood exerts a force on the nail. c The hammer exerts a force on the nail; the nail exerts a force on the hammer. d The hammer exerts a force on the nail; the hammer exerts a force on the wood.

c The hammer exerts a force on the nail; the nail exerts a force on the hammer.

Hang from a pair of gym rings and the upward support forces of the rings will always a each equal your weight. b each be half your weight. c add up to equal your weight. d impossible to say without more information

c add up to equal your weight.

If a nonzero net force is acting on an object, then the object is definitely a at rest. b moving with a constant velocity. c being accelerated. d losing mass.

c being accelerated.

Which of the following is the cause of an acceleration? a speed b inertia c force d velocity

c force

A free-body diagram represents all of the following except a the object. b forces as vectors. c forces exerted by the object. d forces exerted on the object.

c forces exerted by the object.

A newton is equivalent to which of the following quantities? a kg b kgm/s c kgm/s^2 d kg(m/s)^2

c kgm/s^2

A force is a vector quantity because it has both a mass and acceleration. b action and reaction counterparts. c magnitude and direction. d SI units

c magnitude and direction.

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

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

d all of these

Which has zero acceleration? An object a moving at constant velocity. b at rest. c in mechanical equilibrium. d all of these e none of these

d all of these

Without air resistance, a projectile fired horizontally at 8 km/s from atop a mountain would a accelerate downward at g as it moves horizontally. b trace a curve that matches the earth's curvature. c return later to its starting position and repeat its falling behavior. d all of these e none of these

d all of these

What causes a moving object to change direction? a acceleration b velocity c inertia d force

d force

An object is propelled along a straight-line path by a force. If the net force were doubled, the object's acceleration would be a the same. b half as much. c four times as much. d twice as much. e none of these

d twice as much.

A soldier throws a grenade horizontally from the top of a cliff. Which of the following curves best describes the path taken by the grenade? a Hyperbola b Parabola c Circle d Ellipse

b Parabola

You are throwing a ball for the second time. If the ball leaves your hand with twice the velocity it had on your first throw, its horizontal range R (compared to your first serve) would be a 1.4 times as much. b half as much. c four times as much. d twice as much.

c four times as much.

A bullet fired horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice the speed in the same direction, it would have hit the ground in a more than 0.5 s. b depends upon the caliber of the bullet c 0.5 s. d less than 0.5 s.

c 0.5 s.

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. d impossible to say without more information

c 10 N.

A stone is thrown horizontally from the top of a cliff. One second after it has left your hand, its vertical distance below the top of the cliff is a 10 m. b 0 m c 5 m. d 15 m.

c 5 m.

When a football in a field goal attempt reaches its maximum height, how does its speed compare to its initial speed? a It is greater than its initial speed. b It is equal to its initial speed. c It is less than its initial speed. d It is zero.

c It is less than its initial speed.

A bullet is fired horizontally, and at the same instant a second bullet is dropped from the same height. Ignore air resistance. Compare the times of fall of the two bullets. a cannot tell without knowing the masses b The dropped bullet hits first. c They hit at the same time. d The fired bullet hits first.

c They hit at the same time.

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

c increases.

A net force of 6.8 N accelerates a 31 kg scooter across a level parking lot. What is the magnitude of the scooter's acceleration? a 0.22 m/s^2 b 0.69 m/s^2 c 3.2 m/s^2 d 4.6 m/s^2

a 0.22 m/s^2

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 10 times as much. b zero. c one-tenth as much. d the same as the force on the 1-kg book.

a 10 times as much.

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

a 9.8 N.

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is a 800 N. b 400 N. c 200 N. d none of these

b 400 N.

At what angle should a water-gun be aimed in order for the water to land with the greatest norizontal range? a 0° b 45° c 60° d 30°

b 45°

A ball is thrown at an original speed of 8.0 m/s at an angle of 35° above the horizontal. What is the speed of the ball when it returns to the same horizontal level? a 16 m/s b 8.0 m/s c 9.8 m/s d 4.0 m/s

b 8.0 m/s

Which of the following is an example of projectile motion? a a space shuttle being launched b a thrown baseball c a jet lifting off a runway d an aluminum can dropped straight down into the recycling bin

b a thrown baseball

When riding in an elevator on a bathroom scale, the scale will give a value smaller than your true weight when the elevator a accelerates upwards b accelerates downwards c moves at constant speed d is at rest

b accelerates downwards

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 add up to equal your weight. c each equal your weight. d each equal more than half your weight

b add up to equal your weight.

Which has the greater mass? a a king-size pillow b an automobile battery c neither - both have the same d depends upon their location

b an automobile battery

A bullet fired horizontally from a rifle begins to fall a after air friction reduces its speed. b as soon as it leaves the barrel. c neither of these d never

b as soon as it leaves the barrel.

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

b force.

A projectile is launched at ground level an angle of 15 degrees above the horizontal and lands down range. What other projection angle for the same speed would produce the same down-range distance? a 30 degrees b 90 degrees c 50 degrees d 45 degrees e 75 degrees

e 75 degrees

Which statement about the acceleration of an object is correct? a The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the mass of the object. b The acceleration of an object is directly proportional to the net external force acting on the object and directly proportional to the mass of the object. c The acceleration of an object is inversely proportional to the net external force acting on the object and inversely proportional to the mass of the object. d The acceleration of an object is inversely proportional to the net external force acting on the object and directly proportional to the mass of the object.

a

An Olympic athlete throws a javelin at four different angles above the horizontal, each with the same speed: 30°, 40°, 60°, and 80°. Which two throws cause the javelin to land the same distance away? a 30° and 60° b 40° and 60° c 40° and 80° d 30° and 80°

a 30° and 60°

A person is attracted toward the center of Earth by a 500-N gravitational force. The Earth is attracted toward the person with a force of a 500 N. b zero. c 1000 N. d 250 N.

a 500 N.

When a woman stands at rest with both feet on a scale, it reads 500 N. When she gently lifts one foot, the scale reads a 500 N. b more than 500 N. c less than 500 N. d the scale breaks

a 500 N.

For the winter, a duck flies 10.0 m/s due south against a gust of wind with a speed of 2.5 m/s. What is the resultant velocity of the duck? a 7.5 m/s south b -7.5 m/s south c -12.5 m/s south d 12.5 m/s south

a 7.5 m/s south

A hockey stick hits a puck on the ice. Identify an action-reaction pair in this situation. a The stick exerts a force on the puck; the puck exerts a force on the stick. b The stick exerts a force on the puck; the puck exerts a force on the ice. c The puck exerts a force on the stick; the stick exerts a force on the ice. d The stick exerts a force on the ice; the ice exerts a force on the puck.

a The stick exerts a force on the puck; the puck exerts a force on the stick.

Which of the following does not exhibit parabolic motion? a a flat piece of paper released from a window b a frog jumping from land into water c a baseball thrown to home plate d a basketball thrown to a hoop

a a flat piece of paper released from a window

Which of the following is not an example of projectile motion? a a hot-air balloon drifting toward Earth b a long jumper in action c a volleyball served over a net d a baseball hit by a bat

a a hot-air balloon drifting toward Earth

What is the path of a projectile (in the absence of friction)? a a parabola b Projectiles do not follow a predictable path. c a wavy line d a hyperbola

a a parabola

When riding in an elevator on a bathroom scale, the scale will give a value larger than your true weight when the elevator a accelerates upwards b accelerates downwards c moves at constant speed d is at rest

a accelerates upwards

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

a no longer accelerates.

Which of the following is the motion of objects moving in two dimensions under the influence of gravity? a projectile motion b vertical velocity c horizontal velocity d directrix

a projectile motion

When riding in an elevator on a bathroom scale, the scale will give a value larger than your true weight when the elevator (choose all that apply) a starts its upwards journey b starts its downwards journey c is stopping on the way down d is stopping on the way up

a starts its upwards journey c is stopping on the way down

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

a the gravitational attraction force 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 a the mass of the car is independent of gravity. b the weight of the car is independent of gravity. c Nonsense! A car is much more easily accelerated on the moon than on the Earth. d Depends upon the phase of the moon

a the mass of the car is independent of gravity.

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 the one on the moon b They have the same mass. c the one on Earth d not enough information to say

a the one on the moon

Two balls are thrown horizontally. Ball C is thrown with a force of 20 N, and ball D is thrown with a force of 40 N. Assuming all other factors are equal, ball D will fall toward the ground a at a rate that cannot be compared with that of ball C using the information given. b at the same rate as ball C. c faster than ball C. d more slowly than ball C.

b at the same rate as ball C.

A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its vertical component of velocity a remains unchanged. b decreases. c increases. d depends upon its mass

b decreases.

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

b inertia

Which of the following is the tendency of an object to maintain its state of motion? a acceleration b inertia c force d velocity

b inertia

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

b 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 acceleration. b inertia. c resistance. d gravity.

b inertia.

You are pushing a rock along level ground and making the rock speed up. How does the size of the force you exert on the rock compare with the size of the force the rock exerts on you? The force you exert a is larger than the force the rock exerts on you. b is the same size as the force the rock exerts on you. c is smaller than the force the rock exerts on you. d could be any of the above; it depends on other factors.

b is the same size as the force the rock exerts on you.

A projectile is fired horizontally in a region of no air resistance. The projectile maintains its horizontal component of velocity because a it is not acted on by any forces. b it is not acted on by any horizontal forces. c the net force acting on it is zero. d it has no vertical component of velocity to begin with. e none of these

b it is not acted on by any horizontal forces.

Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity a is always zero b remains constant. c decreases. d increases.

b remains constant.

A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its horizontal component of velocity a depends upon its mass b remains unchanged. c increases. d decreases.

b remains unchanged.

When riding in an elevator on a bathroom scale, the scale will give a value smaller than your true weight when the elevator (choose all that apply) a starts its upwards journey b starts its downwards journey c is stopping on the way down d is stopping on the way up

b starts its downwards journey d is stopping on the way up

A hunter on level ground fires a bullet at an angle of 2 degrees below the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first? a depends upon the caliber of the bullet b the fired one c Both hit at the same time. d the dropped one

b the fired one

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 gravity tends to hold the milk carton secure. b the milk carton has inertia. c the milk carton has no acceleration. d there is an action-reaction pair of forces. e none of these

b the milk carton has inertia.

According to Newton's second law, when the same force is applied to two objects of different masses, a the object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration. b the object with greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration. c the object with greater mass will experience a greater acceleration, and the object with less mass will experience a smaller acceleration. d the object with greater mass will experience a small acceleration, and the object with less mass will experience an even smaller acceleration.

b the object with greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration.

A stone is thrown horizontally from the top of a tower at the same instant a ball is dropped vertically. Which object is traveling faster when it hits the level ground below? a the ball b the stone c It is impossible to tell from the information given. d Neither, since both are traveling at the same speed.

b the stone

The magnitude of the gravitational force acting on an object is a frictional force. b weight. c inertia. d mass.

b weight.

For an action force, there must be a reaction force that a is slightly smaller in magnitude than the action force. b is slightly larger in amplitude than the action force. c is exactly equal in magnitude. d always acts in the same direction.

c is exactly equal in magnitude.

The length of a force vector represents the a cause of the force. b direction of the force. c magnitude of the force. d type of force.

c magnitude of the force.

In which case would you have the largest mass of gold? If your chunk of gold weighed 1 N on the a Earth. b planet Jupiter. c moon. d the same mass in all situations

c moon.

When riding in an elevator on a bathroom scale, the scale will give a value equal to your true weight when the elevator (choose all that apply) a accelerates upwards b accelerates downwards c moves at constant speed d is at rest

c moves at constant speed d is at rest

Compared to the mass of a certain object on Earth, the mass of the same object on the moon is a one sixth as much. b zero. c the same. d six times as much.

c the same.

The statement by Newton that for every action there is an equal but opposite reaction is which of his laws of motion? a first b second c third d fourth

c third

A single force acts on an object. The components of this force act along the + x-axis and the -y-axis. The single force that will bring the object into equilibrium has components that act along the a +x-axis and +y-axis. b +x-axis and −y-axis. c −x-axis and +y-axis. d −x-axis and −y-axis.

c −x-axis and +y-axis.

A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air resistance, when the bomb hits the ground the horizontal location of the plane will a depend on the speed of the plane when the bomb was released. b be behind the bomb. c be in front of the bomb. d be over the bomb.

d be over the bomb.

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 a friction of the ground against the player's shoes. b player's grip on the glove. c muscular effort in the player's arms. d force the glove exerts on the ball. e none of these

d force the glove exerts on the ball.

A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first? a the fired one b depends upon the caliber of the bullet c Both hit at the same time. d the dropped one

d the dropped one

As an object falls toward Earth, a the object does not exert a force on Earth. b the object exerts a downward force on Earth. c Newton's third law does not apply. d the upward acceleration of Earth is negligible because of its large mass.

d the upward acceleration of Earth is negligible because of its large mass.

Newton's third law of motion involves the interactions of a one object and one force. b one object and two forces. c two object and one force. d two objects and two forces.

d two objects and two forces.

A car goes forward along a level road at constant velocity. The additional force needed to bring the car into equilibrium is a greater than the normal force times the coefficient of static friction. b equal to the normal force times the coefficient of static friction. c the normal force times the coefficient of kinetic friction. 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 to 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

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has the same a volume. b mass. c weight. d all of these e none of these

e none of these