Physical Science Test 2

What would be a good way to increase the efficiency of a machine?

What term do physicists use to refer to any change in velocity?

what branch of physics addresses the effects of forces on matter?

Which of the following quantities represents any change in an object's position?

V=d/t measures what?

A student calculated that the net force acting on a car was 49,000 N to the right. is he right?

Togehter, the branches of physics discovered before 1900 are called ________________.

P=W/t is the formula for what?

A crate is being pushed by two people. One with 35 N to the left, and one with 26 N to the right. what is net velocity?

________ is the rate of doing work.

IMA= 2piR/P is the formula for what?

What is a combination of one or more fixed pulleys and one or more moveable pulleys called?

Which of the following forces is the attractive force that exists between any two bodies and is caused by their mass?

What principal (law) states the velocity of an object doesn't change unless the object is acted upon by an outside force

The sum of two or more vectors is called a what?

What SI unit is used to measure power?

Calculate the weight of a 180,000kg train engine (Mass x 9.81)

What is the ideal mechanical advantage of an inclined plane with a length of 3 and a height of 1.5?

The center-seeking force that causes an object to travel in a curved path is called____________________.

The space relative to which motion is measured is the _________________.

Which device is considered a circular lever and can be used to multiply distance, speed or force?

What is the velocity of an object that travele 19 m in 2.0 s?

The measure of how well a machine converts input work to output work is _______________.

p=mv is the formula for what?

Which of the following is a form of assistance that a simple machine can provide

What simple machine is a sloping surface that allows an object to be raised without lifting straight up?

What type of friction affects a sliding object already in motion?

What is the output distance of a screw?

Crews needs to move a rock. he has tools to make a simple lever. Which design should he build? why?

any mathematical quantity that has both magnitude and direction is a ____________.

______________ is the term for a measure of how much help a machine provides.

How are levers classified?

F_kf=u_kF_w is the formula for what?

What type of friction affects stationary objects, preventing them from moving?

An object that hangs from a fixed point and swings back and forth because of gravity is a _____________.

W=Fd is used to calculate what?

What is the momentum of a 5 kg bowling ball rolling forward at 7 m/s?

IMA=d_i/d_o is the formula for what?

Who discovered the laws of motion and gravitation?

Whose teachings dominated scientific thought for almost 2,000 years?

The simple machine that is an incline plane modified to apply force and direct it to the sides is a ____________.

d=1/2 gt² describes the relationship between what two things?

What is the total displacement of a person who walked 137 m North and then 39 m South? (North is +, South is -)

Which of the following statements correctly describes work and energy?

Calculate the work performed by a moving crew who lifted a couch .80 m off the ground with a force off 700 N (FD)

What is the study of motion and forces?

A point (or ordered pair) is on a cartesian plane, is it considered a scalar, or a vector quantity? why?

F_w=mg represents what?

The distance an object travels per unit of time is called what?

How far will an object fall if it is affected by only gravity and falls for 3 seconds? 1/2X(9.81)(3²)

What force is required to accelerate a 180,000 kg train 2 m/s? (Mass x Acceleration)

What principle (law) states that for every action there is an equal and opposite reaction?

What quantity of motion is defined as the product of an object's mass and velocity?

A simple machine consisting of a wheel over which a rope passes is a ____________

F=ma is short hand for which of Newton's laws?

What is the velocity at which air resistance stops a falling object from accelerating?

What type of quantity consists only of magnitude, with no direction?

A box weighing 90 N is pushed against a floor with a friction of (0.30) what force has to applied to get it moving? Mult

What is the SI unit of work?

Devices used to multiply force for the purpose of doing work are all known as ________________.

n=W_o/W_i is the formula for what?