Physical Science Test 7 Review

F=ma

Name the resistance arising to an object's motion through a fluid or across a surface.

The "quantity of motion" of an object, equal to the product of the object's mass and velocity, is    ?   .

If a moving walkway is going west at 40 cm/s, what is the total velocity of a man on the walkway who walks east at 20 cm

Isaac Newton published the laws of motion and universal gravitation in his book    ?   .

resembles an inclined plane wrapped around a rod

The type of friction that affects moving objects is static friction.

The distance between a lever's fulcrum and the input force is the length of the input distance.

"circular lever"

What term refers to the gravitational force exerted on an object near the surface of the earth or any celestial body?

The thrust of a rocket is an example of the third law of motion.

What is the actual mechanical advantage of a machine that allows a man to lift a 500 N box with an input force of 25 N

The SI unit of power is the    ?   .

Under ideal conditions, a machine's work output is    ?    its work input.

sloping surface that allows an object to be raised without lifting it straight up

What term refers to the branches of physics developed before the 20th century?

any two objects attract each other with a force that depends on their masses and the distance between them

What is the average acceleration of a car that accelerates from 10. m/s forward to 20. m/s forward in 5.0 s?

Which of the following is not a form of assistance provided by simple machines?

What is defined as distance traveled in a given time?

The acceleration of gravity at the surface of the earth is    ?   .

Which has more momentum: a 2,000 kg cement truck traveling at 5 m/s or a 10,000 kg racecar traveling at 90 m/s?

for every action there is an equal and opposite reaction

The velocity at which the force of air resistance on a falling object equals the object's weight is the    ?    velocity

What is the average speed of a car that travels 50 km in 5 hr?

d=1 /2 gt ²

Physical quantities having magnitude but not direction are    ?    quantities.

combination of fixed and movable pulleys

The thrust of a rocket is an example of the third law of motion.

Physical quantities having both magnitude and direction are    ?    quantities.

The vector representing the change in an object's position is    ?   .

A "center-seeking" force that causes an object to travel in a curved path rather than in a straight line is    ?    

P=W over t

What is the name for the distance between the ridges on a screw?

A lever that has the input and output forces on either side of the fulcrum is a class 3 lever.

s=d over t

How much work does an elevator do in lifting a 700. N person 50. m? W = 

Two vectors that are either in the same direction or in opposite directions are collinear.

c 2 =a 2 +b 2 is the formula for the pythagorem theorem.

Which of the following does not affect the force of friction?

Velocity is a vector quantity.

special form of inclined plane that modifies force and directs it to the side

A 2 kg brick and a 200 kg safe were both dropped from the top of a tall building at the same time.  Which is true?

when the overall external force acting on a system is zero, the momentum of the whole system remains constant

states the relationship between the hypotenuse and legs of a right triangle

IMA=d i over d o

What is the SI unit of force?

v=Δx over t

The branch of physics that deals with the effects of forces on matter is mechanics.

the velocity of an object does not change unless the object is acted upon by an external force

The rate of doing work is called time.

In physics, any change in speed, direction, or both is    ?   .

A man exerts 250 N of force on a mule for 10 min, but the mule does not move.

F=Gm 1 m 2 d 2

A measure of how well a machine converts input work into output work is the machine's IMA.