physics

Question 1

newtons 1st law of motion

Answer 1

an object remains at rest or in constant motion in a straight line, unless it is acted upon by force

Question 2

newtons 3rd law of motion

Answer 2

for every action there is an equal and opposite reaction

Question 3

inertia definition

Answer 3

• the tendency of an object to resist change in its motion

- the greater the mass of an object, the grater the inertia

Question 4

mass definition

Answer 4

• measured in kg

- is a measure of a body’s inertia

Question 5

weight definition

Answer 5

• measured in N

- is the force of gravity on an object

Question 6

work definition

Answer 6

• work is done whenever a force is used to move something

Question 7

power definition

Answer 7

• power is the rate of work being done, measured in Watts

P = work(J) / time taken(s)

Question 8

energy definition

Answer 8

is the ability to do work, measured in joules (J)

Question 9

kinetic energy

Answer 9

• is the energy an object has from its movement

Question 10

potential energy

Answer 10

• is an object’s stored energy

Question 11

gravitational potential energy

Answer 11

• is the potential energy stored in an object due to its position

Question 12

law of conservation

Answer 12

energy can not be created or destroyed, only transferred from one form to another

Question 13

examples of types of energy

Answer 13

• kinetic
• thermal
• nuclear
• sound
• light
• chemical (potential)

Question 14

examples of transfer of energy

Answer 14

rubbing hands - kinetic - heat
lights on - electrical - light

fossil fuels
chemical - heat - kinetic - electrical

Question 15

work done is equal to …

Answer 15

energy transferred

Question 16

weight is an example of …

Answer 16

force

Question 17

acceleration definiton

Answer 17

rate of change of velocity

Question 18

net force definition

Answer 18

overall unbalanced forces acting on one object