p2 forces

Question 1

define a scalar quantity

Answer 1

a quantity which has size (magnitude) only

Question 2

what is the equation for speed

Answer 2

speed = distance / time

Question 3

give three examples of scalar quantities

Answer 3

speed
distance
time

Question 4

define a vector quantity

Answer 4

a quantity with both size (magnitude) and direction

Question 5

define velocity

Answer 5

speed in a particular direction

Question 6

define displacement

Answer 6

the distance moved in a particular direction

Question 7

what is the equation for velocity

Answer 7

velocity = displacement / time

Question 8

define acceleration

Answer 8

the rate of change of velocity

Question 9

what is the equation for acceleration

Answer 9

acceleration = change in velocity (m/s) / time (s)

Question 10

what is acceleration measured in

Answer 10

m/s**2

Question 11

what is the unit for forces

Answer 11

Newtons (N)

Question 12

when do forces occur

Answer 12

when there is an interaction between two objects

Question 13

list all the contact forces

Answer 13

friction
air resistance (drag)
upthrust
lift
tension
normal contact

Question 14

list all the non contact forces

Answer 14

gravitational (weight)
magnetic
electrostatic

Question 15

define a balanced force

Answer 15

two equal forces in opposite directions (constant speed)

Question 16

define an unbalanced force

Answer 16

when the force in one direction is greater than the force in the opposite direction

Question 17

define kinetic energy

Answer 17

the energy of a moving object

Question 18

what is the equation for kinetic energy

Answer 18

kinetic energy (j) = 1/2 x mass (kg) x velocity**2 (m/s)

Question 19

define gravitational potential energy

Answer 19

energy stored by something above the earths surface

Question 20

what is the calculation for gravitational potential energy

Answer 20

gpe (j) = mass (kg) x gravitational feild strength (N/kg) x height (m)

Question 21

what is the gravitational field strength on earth

Answer 21

10N/kg

Question 22

what does suvat stand for

Answer 22

s = displacement (m)
u = initial velocity (m/s)
v = final velocity (m/s)
a = acceleration (m/s**2)
t = time (s)

Question 23

what are the three suvat equations

Answer 23

v = u + at
s = 1/2 (u+v) t
v2 = u2 + 2as