Energy Force And Motion

Question 1

Define energy

Answer 1

The ability to do work

Question 2

Define motion in terms of physics

Answer 2

Motion is the change of location or position of an object with respect to time. Motion is an objects change of position over time

Question 3

Define force

Answer 3

Force is an influence that causes an object to change position

Question 4

Define gravity

Answer 4

A downwards force of attraction that the earth exerts on all object of mass

Question 5

Define friction

Answer 5

A force slowing movement down. It results from when surfaces rub against one another

Question 6

Define symmetry

Answer 6

Two sides are similar

Question 7

Define wind power

Answer 7

The use of air flow through wind turbines to mechanically power generators for electrical power.

Question 8

Define speed

Answer 8

A quantity that refers to the rate at which an object covers a distance

Question 9

Define weight

Answer 9

The product of mass times gravitational acceleration, which is just another kind of force

Question 10

Define mass

Answer 10

The amount of matter an object contains

Question 11

Distinguish the difference between mass and weigh

Answer 11

MASS

• The amount of matter contained in an object
• Mass uses the unit kg
• mass never changes

WEIGHT

• The downwards force of attraction that the earth exerts on all objects of mass
• weight uses the unit N
• weight changes depending on where you are

Question 12

What is the relationship between mass and inertia

Answer 12

Inertia increases with mass. Mass is a quantity that is solely dependent upon the inertia of an object. The more inertia an object has the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion

Question 13

Define acceleration

Answer 13

The rate of change of velocity of an object with respect to time. An objects acceleration is the net result of any and all forces acting on the object

Question 14

What is the SI unit for displacement

Answer 14

m

Question 15

What is the SI unit for speed and velocity

Answer 15

M/s

Question 16

What is the SI unit for mass

Answer 16

Kg

Question 17

What is the SI unit for acceleration

Answer 17

m/s squared

Question 18

Who was the discoverer of gravity

Answer 18

Sir Isaac Newton— an English mathematician and mathematician and physicist who lived from 1642 to 1727. The legend is he discovered gravity when he saw a falling apple while thinking about the forces of nature

Question 19

Define gravitation

Answer 19

Gravitation is a constant force due to gravitational acceleration, which causes cause massive bodies to exert a downwards force on the earth

Question 20

What is the formula for the force of gravity

Answer 20

Force of gravity = mass x 10 m/s

Question 21

What do you have to do to overcome gravity and lift a massive body

Answer 21

You must produce an upwards force ma that is greater than the downward gravitational force mg

Question 22

What is the formula for work

Answer 22

Work = force x distance

Question 23

Define gravitational energy

Answer 23

The energy an object has due to its position above the earth, energy due to its height

Question 24

Define chemical energy

Answer 24

Energy stored in the bonds of chemical compounds. It is released in a chemical reaction, often producing heat as a by product (exothermic reaction).

Question 25

What are the examples of stored chemical energy

Answer 25

Batteries, biomass, petroleum, natural gas and coal

Question 26

What are examples of electrical potential energy

Answer 26

Shocks, lighting, electricity

Question 27

Define nuclear energy

Answer 27

The potential energy of the particles inside an atomic nucleus

Question 28

Define elastic energy

Answer 28

Potential energy stored as a result of deformation of an elastic object such as the stretching of a spring or elastic band

Question 29

Define light energy

Answer 29

Light energy is a type of kinetic energy with the ability to form types of light people can see as well as invisible waves.

Question 30

Define thermal energy

Answer 30

The internal energy of an object due to the kinetic energy of its atoms and or molecules

Question 31

List 11 forms of energy

Answer 31

Kinetic, electrical, light, thermal, sound, chemical, potential, kinetic, solar, electromagnetic and nuclear

Question 32

Define kinetic/mechanical energy

Answer 32

The energy of moving things

Question 33

Define potential energy

Answer 33

Potential energy is stored energy

Question 34

What is Einstein’s law

Answer 34

Energy can neither be created nor destroyed. Rather, it transforms from one form to another

Question 35

What is Newton’s first law or physics (inertia)

Answer 35

A body at rest with remain at rest, and a body In motion will remain in motion unless it is acted upon by an external force.

Question 36

What is Newton’s second law of motion

Answer 36

The force acting on an object is equal to the mass of that object times it’s acceleration F=ma

Question 37

What is Newton’s third law of motion

Answer 37

For every action there is an equal and opposite reaction