The front seat of the car

A passenger in the rear seat of a car moving at a steady speed is at rest relative to

the width of a book

Which distance can be most accurately measured with a ruler

1000

one kilometer equals 1000 meters. what does the prefix kilo- mean?

0 miles

a person walks 1 miles every day for excercise, leaving her front porch at 9:00 am and returning to her front porch at 9:25 am. What is the total displacement of her daily walk?

4 meters

A ball is rolled uphill a distance of 5 meters before it slows, stops , and begins to roll back. the ball rolls downhill 9 meters before coming to a rest against a tree. What is the magnitude of the ball’s displacement?

2 km south

displacement vectors of 4km south, 2km north, 5km south, and 5 km north combine to a total displacement of

km/h

What is the most appropriate SI unit to express the speed of a cyclist in the last leg of a 10-km race

the amount of time needed to travel the distance

speed is the ratio of the distance an object moves to

at a particular instant

instantaneous speed is measured

42 km/hr

a car traveled 60 km in 2 hours, 84 km in the next 1 hour, and 68 km in 2 hours before reaching is destination. What was the car’s averages speed?

speed, equal to the speed of the object that it represents

the slope of a line on a distance-time graph is

at rest

a horizontal line on a distance-time graph means the object is

S=d/t

what is the speed of a bobsled whose distance-time graph indicates that it traveled 100 m in 4 s and then remains at rest for 6 s . what is the average speed of the object

10 m/s

A distance-time graph indicates that an object moves 100 m in 4 s and then remains at rest 6 s. What is the average speed of the object?

by adding the vectors

A river current has a velocity of 5 km/h relative to the shore, and a boat moves in the same direction as the current at 5 km/h relative to the river. How can the velocity of the boat relative to the shore be calculated.

more than one direction, speed, or velocity. (all of the above?)

vector addition is used when motion involves

acceleration

the rate at which velocity changes is called

a ball moving at a constant speed around a circular track

which example identifies a change in motion that produces acceleration

constant acceleration

objects in free fall near the surface of the earth experience

2 m/s ^2

suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 1 s. What is your acceleration

-6 m/s²

An object moving at 30 m/s takes 5 s to com to a stop. What’s the objects acceleration

acceleration

the slope of a speed-time graph indicates

linear, sloping downward

a speed-time graph shows that a car moves at 10 m/s for 10 s. the car’s speed then steadily decreases until it comes to a stop at 30 s. which of the following describes the slope of the speed-time graph from 10 s to 30 s?

speeding up, slowing down, or changing direction.

An object that is accelerating may be

the trains acceleration is negative

a train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train’s acceleration be described?

newton

The SI unit of force is the

1 N = 1kg x m/s2 (squared)

Which of the following relationships is correct

the object accelerates

when an unbalanced force acts on an object

equal to zero

when a pair of balanced forces acts on an object, the net force that results is

Fluid Friction

What kind of friction occurs as a fish swims through water

acts in the direction opposite of motion

as you push a cereal box across a tabletop, the sliding friction acting of the cereal box

Gravity & Air Resistance

the forces acting on a falling leaf are

Increasing surface area

an open parachute increases air resistance of a falling sky diver by

inertia

the property of matter that resists changes in motion is called

the orange’s inertia

an orange might roll off your cafeteria tray when you stop suddenly because of

mass

according to newton’s second law of motion, the acceleration if an object equals the net force acting on the object divided by the object’s

6 m/s ²

if a force of 12 N is applied to an object with a mass of 2 kg, the object will accelerate at

mass times the acceleration due to gravity

your weight equals your

one third its weight on Earth’s surface

the acceleration due gravity on the surface of Mars is about one third of the acceleration due to the gravity on Earth’s surface. The weight of a space probe on the surface of mars is about

action and reaction forces

Newton’s third law of motion describes

all of the above

in which of the following are action and reaction forces involved

momentum

the product of an objects mass and velocity is its

250 kg.m/s

what is the momentum of a 50- kilogram ice skater gliding across the ice at a speed of 5 m/s

decreases because gravity decreases

As an astronaut travels far away from earth, her weight

will continue moving at the same velocity unless an outside force acts on it

will continue moving in a straight line unless an outside force acts on it

that is not moving will never move unless a force acts on it

at rest will remain at rest unless acted on by an outside force

will continue moving in a straight line unless an outside force acts on it

that is not moving will never move unless a force acts on it

at rest will remain at rest unless acted on by an outside force

the law of inertia states that an object

both moving and nonmoving objects

the law of inertia applies to

zero, since no force is necessary to keep it moving

after a cannonball is fired into frictionless space, the amount of force needed to keep it going equals

inertia

one object has twice as much mass as another object. the first object also has twice as much

less

compared to its weight on earth, a 10-kg object on the moon will weight

the same, it does not change, only the weight changes

compared to its mass on earth, the mass of a 10-kg object on the moon is

has zero acceleration

an object following a straight-line path at a constant speed

30 N

a 15-N force and a 45-N force act on an object in opposite directions. what is the net force of an object

Ball on the bat

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

440 N

A person is attracted towards the center of Earth by a 440-N gravitational force. The force with which Earth is attracted toward the person is

the same

an unfortunate bug splatters against the windshield of a moving car. compared to the force of the car on the bug, the force of the bug on the car is

larger

an unfortunate bug splatters against the windshield of a moving car. compared to the deceleration of the car, the deceleration of the bug is

twice as much momentum

compared to a sports car moving at 30 miles per hour, the same sports car moving at 60 miles per hour has

impulse acting on it

If the momentum of an object is equal to the

the net force applied to the object

the momentum change of an object is equal to

Increase the force acting on it, follow through when hitting the ball, increase the time of contact with the ball, All of the above

in order to increase the final momentum of a golf ball, we could

increase the time of impact in a collision,

the reason padded dashboards are used in cars is that they

throw something in the direction opposite to that in

suppose a girl is standing on a pond where there is no friction between her feet and the ice. in order to get off the ice, she can

a pickup truck traveling down the highway

which of the following has the largest momentum

na

a freight rolls along a track with considerable momentum. if it were to toll at the same speed but it had twice as much mass, the mass would be

cannon has more mass

a cannon recoils from launching a cannonball. the speed of a cannons recoil is small because the

time of impact is increased

in order to catch a ball, a baseball player moves his or her hand backward in the direction of the balls motion. doing this reduces the force of impact on the players hand principally because

1.4 m/s 2

A tow truck exerts a net horizontal force of 1050 N on an 760-kilogram car. What is the acceleration of the car during this time

34.3 newtons

the mass of a newborn baby is 3.5 kilograms. What is the baby’s weight?

83.8 (kg*m)/s (or 83.6?)

A 38-kilogram canoe broke free of its dock and is now floating downriver at a speed of 2.2 m/s. What is the canoes momentum?

3.3 kg*m/s

A small engine causes a 0.3-kg model airplane to accelerate at a rate of 11 m/s². What is the net force on the model airplane.