Chapter 20 Vocab

Question 1

Newton’s 2nd law of motion

Answer 1

“The acceleration of an object depends on the mass of the object and the amount of force applied”

Question 2

Newton’s 3rd law of motion

Answer 2

“Whenever one object exerts a force on a second object. The second object exerts an equal and opposite force on the first.”

Question 3

Free fall

Answer 3

the motion of a body when only the force of gravity is acting on the body

Question 4

Projectile motion

Answer 4

The curved path that an object follows when thrown launched, or otherwise projected near the surface of Earth

Question 5

Intertia

Answer 5

the tendency of an object to resist being moved or if the object is moving to resist a change in speed or direction until an outside force acts on the object.

Question 6

Momentum

Answer 6

a quantity defined as the product of the mass and velocity of an object.

Question 7

Newton’s 1st law of motion

Answer 7

“An object at rest remains at rest. And an object in motion remains in motion out constant speed and in a straight line unless acted on an unbalance force.”

Question 8

Terminal velocity

Answer 8

the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction

Question 9

Compound machine

Answer 9

a machine made of more that one simple machine

Question 10

Screw

Answer 10

a simple machine that consists of an inclined plane wrapped around a cylinder

Question 11

Wedge

Answer 11

a simple machine that is made up of two inclined planes and that moves; often used for cutting

Question 12

Wheel and axles

Answer 12

a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the 2 circular objects

Question 13

Pulley

Answer 13

a simple machine that consists of a wheel over which a rope, chain, or wire passes

Question 14

Lever

Answer 14

a simple machine that consists of a bar that pivots at a fixed point called a fulcrum

Question 15

Watt

Answer 15

the unit used to express power; equivalent to joules per second

Question 16

Machine

Answer 16

a device that helps do work by either overcoming a force or changing the direction of the applied force

Question 17

Power

Answer 17

the rate at which work is done or energy is transformed.

Question 18

Joule

Answer 18

the unit used to express energy; equivalent to the amount of work done by a force of 1 N acting through a distance of 1 meter in the direction of the force.

Question 19

Work

Answer 19

the transfer of energy to an object by using a force that causes the object to move in the direction of the force

Question 20

Incline plane

Answer 20

A simple machine that is a straight, slanted surface, which facilitates the raising of loads