forces and motion

Question 1

how do you convert m/s into km/s

Answer 1

Multiply by 3.6 (other way for km/s to m/s)

Question 2

How do you calculate speed

Answer 2

speed=distance/time

Question 3

average speed

Answer 3

total distance/total time

Question 4

how do you calculate gradient

Answer 4

gradient=rise(distnace)/run(time)

Question 5

what is velocity

Answer 5

velocity is a speed and direction

Question 6

what is acceleration

Answer 6

accelertaion is any process where the velocity changes

Question 7

how to calculate accelreation

Answer 7

acceleration=change in speed (in m/s)/time taken (in s)

Question 8

what is a force

Answer 8

a force is a push, pull or twist

Question 9

list some contact forces

Answer 9

• friction
• air and water resistance
• force from water
  -force from machines/muscles

Question 10

list some non-contact forces

Answer 10

• gravitational forces
• electrostatic forces
• magnetic forces

Question 11

what is Newtons third law of motion

Answer 11

for every action (force) in nature there is an equal and opposite reaction.

Question 12

what is force measure in

Answer 12

force is measured in newtons (N) using a force meter

Question 13

what is mass measure in?

Answer 13

mass is measure in kg

Question 14

what is mass

Answer 14

how much matter is in an object

Question 15

what is weight

Answer 15

hiow much force is exerted on an object by gravity

Question 16

what is weight measured in

Answer 16

weight is measured in Newtons (N)

Question 17

how to calculate weight

Answer 17

weight=mass x gravity
(N) (kg) (n/kg)

Question 18

what is gravity on earth

Answer 18

10

Question 19

what is magnitude

Answer 19

how large the force is (newtons)

Question 20

what is direction

Answer 20

which way the force is acting

Question 21

what is the law of conservation of energy?

Answer 21

• energy come in different forms
• energy cannot be created or destroyed
• energy can be changed into other forms of energy

Question 21

how to calculate force

Answer 21

force = mass x acceleration

Question 22

what is work measured in

Answer 22

measures in joules (J) or kilojoules (kj)

Question 22

what is energy used for

Answer 22

required to make things move or change

Question 23

what is energy measure in

Answer 23

measure is joules (J) or kilojoules (kj)

Question 24

what is energy active forms

Answer 24

• heat
  -kinetic
  -light
  -sound
  -electric
• electro magnetic

Question 24

potential forms of energy

Answer 24

• chemical potential energy
• gravity potential energy
• magnetic potential energy
• nuclear potential energy
• elastic potential energy
• mechanical potential energy

Question 24

what is work

Answer 24

work is amount of energy used to move and object

Question 25

what is power measured in

Answer 25

measured in watts (W) or joules per second (J/s)

Question 26

how do you calculate work

Answer 26

work = force x distance

Question 27

what is power

Answer 27

rate at which work is done