Forces for y11 mocks

Question 1

what is a force

Answer 1

a push or pull that acts on an object due to an interaction with another object

Question 2

what are some contact forces

Answer 2

-friction
-air resistance
-tension
-normal contact force(force that acts against stationary weight)

Question 3

what are some non contact force

Answer 3

gravitational
magnetic
electrostatic

Question 4

Is air resistance a contact or non-contact force? Explain why.

Answer 4

Air resistance is a contact force. This is because it is due to the physical contact (collisions) between an object and the particles in the air.

Question 5

what are examples of scalars

Answer 5

speed
time
mass
distance

Question 6

what are vectors

Answer 6

velocity
force
momentum
displacement
acceleration

Question 7

Is power a vector or a scalar quantity? Explain your answer.

Answer 7

Power is a scalar quantity because it only has a magnitude (how many watts), it doesn’t have a direction.

Question 8

what are free body diagrams and what do they contain

Answer 8

diagrams that show all the forces acting on an object

Question 9

what is the resultant force

Answer 9

the overall force on an object.

Question 10

for an object to stay still what must happen +an example

Answer 10

more than 1 force must be applied

eg:squishing ball on floor
floor pushes ball up

Question 11

what are the 2 types of deformation(change of shape)

Answer 11

elastic(object returns back to og shape when force is removed)

inelastic(stays deformed)

Question 12

how can we measure extension

Answer 12

measure how springs length changes as downwards force is applied(mass)

Question 13

relation between f and e

Answer 13

f is directly proportional to e

Question 14

higher spring constant

Answer 14

stiffer the material/less elastic

Question 15

what is hookes law

Answer 15

f(N) and e(m) are directly proportional

Question 16

what are the things that can happen to an object if a force is applied

Answer 16

stretch, compress, or bend

Question 17

what is elastic potential energy

Answer 17

energy transferred to an object as it is stretched

Question 18

what is the spring constant/elastic potential energy on a force / extension graph

Answer 18

-gradient on the straight part of the graph
-elastic potential energy

Question 19

what is the limit of proportionality

Answer 19

where the object stops obeying hookes law

Question 20

when a stretched object is released what energy is the epe transferred to

Answer 20

kinetic energy

Question 21

what are the speeds of common objects and average people

Answer 21

walking:1.5m/s
running 3m/s
car 30m/s

Question 22

what is the rate of change in velocity/acceleration

Answer 22

how quickly something speeds up

Question 23

what can acceleration in the 2 equations be assumed as

Answer 23

9.8m/s

Question 24

what is gradient on a distance time graph

Answer 24

speed

Question 25

curved upwards and curved downwards means the tangent will be

Answer 25

upwards:tangent bottom
down:tangent above

Question 26

On a distance / time graph, the distance is on the ?
-axis and the time is on the ?
-axis.

Answer 26

distance:y
time:x

Question 27

curve steepens means

Answer 27

object is accelerating

Question 28

what is the gradient of a velocity time graph

Answer 28

acceleration

Question 29

area under curve=

Answer 29

distance travelled

Question 30

how to find distance travelled on velocity time graph

Answer 30

count squares under graph

Question 31

what is terminal velocity

Answer 31

where velocity remains constant

Question 32

what does the size of the air resistance depend on

Answer 32

the number of collisions which depends on the sa of the person and velocity

Question 33

what happens when the diver reaches terminal velocity

Answer 33

resultant force between air resistance is 0

Question 34

what happens when the diver pulls out a parachute at terminal velocity

Answer 34

surface area will increase hugely so air resistance will increase making resultant force be in the upwards direction but as they slow down until resultant force reduces until 0

Question 35

what is newtons 1st law

Answer 35

resultant force is required to move object

Question 36

what is newtons 2nd law

Answer 36

if non 0 force acts on an object it will accelerate

rf=ma

Question 37

what is inertia

Answer 37

unless acted on by rf objects at rest will stay at rest and objects in motion will remain at motion

Question 38

what is inertial mass

Answer 38

mass=force/acceleration

Question 39

what is newtons 3rd law

Answer 39

when 2 forces interact the forces they exert on each other are equal and opposite

Question 40

what is the force exerted on you if you push a box

Answer 40

normal contact force