Physics

Question 1

Conversion

Answer 1

10^12- Tera (T)
10^9- Giga (G)
10^6- Mega (M)
10^3- Kilo (k)
10^2- Hecto (h)
10^-2 - centi (c)
10^-3 - milli (m)
10^-6 - mico (funny m)
10^-9 - nano (n)
10^ -12 - pico (p)

Question 2

Law of indicies

Answer 2

✖️➡️➕
➗➡️➖
➖➡️✖️

Question 3

Conversion example

Answer 3

250cm to m
250✖️10^-2m
=2.5m

Question 4

Resultant vector formula

Answer 4

R= square root a^2 + b^2

Question 5

What is a vector quantity and a eg?

Answer 5

A vector quantity is one that requires both magnitude and direction in order to be fully understood e.g force, acceleration, velocity, displacement

Question 6

What is a scalar quantity and a eg

Answer 6

A scalar quantity is one that only requires magnitude in order to be fully understood e.g time, speed, mass, length, temperature

Question 7

Suvat equations

Answer 7

U- initial velocity
V- final velocity
V- average, uniform velocity (with the style at the top)

Question 8

What happens to a body with a constant displacement?

Answer 8

It keeps the same location for a period of time

Question 9

Constant, increasing and decreasing what kind of gradient do they have?

Answer 9

Constant(no movement)- zero gradient
Increasing- positive gradient
Decreasing- negative gradient

Question 10

Formula for gradient

Answer 10

Gradient m, is velocity
V= SB- SA / tB - tA
Where S is displacement and t is time

Question 11

What is the formula for force

Answer 11

F= m✖️a
Force(N) = mass(kg) ✖️acceleration(m/s^2)

Question 12

What are the two types of forces

Answer 12

Contact (physical touch)- occur when bodies are touching eg friction

Non contact (act from a distant)- forces that act from a distance eg magnetic

Question 13

Formula for when force is applied to a spring

Answer 13

F=k x where:
F is load
X is extension
K is spring constant

Question 14

What is momentum?

Answer 14

The momentum of a body speaks to the amount of motion that this body possesses

Question 15

Momentum formula

Answer 15

Momentum= mass (kg)✖️velocity (m/s)

Question 16

What is collision

Answer 16

A collision is an event which a moving body hits another body and after the impact the bodies may stick together or separate

Question 17

What is it known as when a body separate after collision

Answer 17

This is known as the elastic collision

Question 18

What is it known as when the body sticks together after collision

Answer 18

This is known as an inelastic collision

Question 19

What is moment

Answer 19

Moment also known as the torque is the turning effect that the force has on a body

Question 20

What is the formula for moment

Answer 20

M=F (N)✖️S (m)

Question 21

What is another name for gravitational force

Answer 21

Weight

Question 22

What is the weight formula

Answer 22

W=m✖️g
G= 10m/s^2

Question 23

What is equilibrium

Answer 23

Equilibrium is the state of being balanced, level or equal

Question 24

What are the types of equilibrium and their meaning

Answer 24

• center of gravity- this is the balance point of an object.

• stable equilibrium- this is when an object returns to its original position after being slightly disturbed.

• unstable equilibrium- this is when an object is in a position where even an tiny disturbance can cause it to fall over.

• neutral equilibrium- this is when an object remains in its new position after being disturbed.

Question 25

Stability
Finish the sentences:
A) The wider the base the….
B) the lower the center of gravity the…

Answer 25

The wider the base the more stable the object (stable means less likely to fall)

The lower the center of gravity the more stable the object

Question 26

What is the meaning of effort and load force?

Answer 26

Effort force- this is force supplied by user into system machine.

Load force- this is the force the user is trying to overcome (the work that needs to be done)

Question 27

What is a force multiplier and a distance multiplier

Answer 27

A force multiplier is a device or machine that enables a small effort to overcome a large load eg: crowbar, hammer, boom

A distance multiplier uses a small distance at the effort end to overcome a large distance at the load end eg: fishing rod, bicycle gears

Question 28

What is the difference between force multiplier and distance multiplier

Answer 28

Force multiplier focuses on increasing the force applied while, a distance multiplier focuses on increasing the distance over which the force is applied

Question 29

What is mechanical advantage and its formula

Answer 29

Mechanical advantage is described as the ratio of the load to the effort
M.A= load(N) / effort(N)
Note: mechanical advantage has no newtons or units because it is an dimensionless quantity

Question 30

What is work?

Answer 30

Work is said to be done when:
A) a force is applied to a body and the body moves in the direction of the force that is applied to it.
B) when energy changes magnitude, form or state.

Question 31

What is energy?

Answer 31

Energy is the ability to do work

Question 32

What are some forms of energy

Answer 32

Electrical, mechanical, nuclear, heat

Question 33

What are the states of energy

Answer 33

Potential and kinetic

Question 34

What is the symbol and formula for work

Answer 34

W is the symbol for work
W=force✖️displacement
W=F✖️S

Question 35

What is gravitational potential energy

Answer 35

The stored energy that a body has due to its location (height) in a gravitational field
G.P.E= m(kg) g(m/s^2)✖️h (m)

Question 36

What is power

Answer 36

The rate at which work is done

Question 37

Formula for power

Answer 37

Power= work done / time taken
P= F s/t = F✖️V

Question 38

What unit is power measured in

Answer 38

Watts

Question 39

Graphs of a motion gradient is

Answer 39

a= 🔼v / 🔼t ,v is m/s^-1 and t is s

Question 40

Areas under velocity time graph

Answer 40

Triangle= 1/2 base✖️height= 1/2✖️t✖️(v-u)
Rectangle= base✖️height= u✖️t=ut

Question 41

Mechanical advantage

Answer 41

Mechanical advantage= load / effort