Matter and Energy

Question 1

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

Accepted Answer

Newton's third law of motion

Question 2

Whose teachings dominated scientific thought for almost two thousand years?

Accepted Answer

Aristotle

Question 3

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

Accepted Answer

inclined plane

Question 4

What is the speed of an object that traveled 19 m in 2.0 s?

Accepted Answer

9.5 m/s

Question 5

If a device is to multiply speed, why must the input distance be greater than the output distance?

Accepted Answer

the time for moving both distances is the same

Question 6

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

Accepted Answer

35 kg m/s forward

Question 7

What is any variation in the rate of an object's change in position over time?

Accepted Answer

acceleration

Question 8

What principle states that the velocity of an object doesn't change unless the object is acted upon by an external force

Accepted Answer

Newton's first law of motion

Question 9

A certain point on a Cartesian plane can be represented by (2,3). Is the point's position scalar or vector? Why?

Accepted Answer

vector, because the ordered pair includes the direction

Question 10

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

Accepted Answer

terminal velocity

Question 11

Who discovered the laws of motion and gravitation, laying the foundation for much of modern physical science?

Accepted Answer

Isaac Newton

Question 12

How far will an object fall if it is affected by only gravity and falls for 3.0 s?

Accepted Answer

44 m

Question 13

What is the term for a measure of how much help a machine provides?

Accepted Answer

mechanical advantage

Question 14

What is the ideal mechanical advantage of an inclined plane with a length of 3.0 m and a height of 1.5 m?

Accepted Answer

2.0

Question 15

A student calculated that the net force acting on the car below is 49,000 N to the right.

Accepted Answer

no, he should have added the forces

Question 16

What is the SI unit of work?

Accepted Answer

joule

Question 17

What is a simple machine consisting of a wheel over which a rope or cable passes?

Accepted Answer

pulley

Question 18

What is any mathematical quantity that has both magnitude and direction?

Accepted Answer

vector

Question 19

What is the rate of doing work?

Accepted Answer

power

Question 20

which of the following statements correctly describes work and energy?

Accepted Answer

work is the transfer of energy from one object to another by a force

Question 21

A man needs to lift a large rock. He has supplies with which he can make a lever. Which lever should he choose? Why?

Accepted Answer

fulcrum between input & output + long input arm; * force & > direction

Question 22

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

Accepted Answer

All are forms of assistance that a simple machine can provide.

Question 23

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

Accepted Answer

momentum

Question 24

A crate being pushed east with a force of 35N and west with a force of 26N. What is the net force on the crate?

Accepted Answer

9 N to the east

Question 25

What is the output distance of a screw?

Accepted Answer

distance between two adjacent threads

Question 26

How are levers classified?

Accepted Answer

arrangement of the arms and fulcrum

Matter and Energy

Questions 26

Matter and Energy

Questions 26