Motion And Forces

Question 1

What is the equation for average speed?

Answer 1

Initial speed+final speed/2
Or
Total distance/Total time

Question 2

What is the equation for “rate or change of speed”
(Acceleration or retardation)

Answer 2

Final speed - Inital speed/Total Time

Question 3

How to find max speed

Answer 3

AVG speed x2

Question 4

Equation for velocity

Answer 4

Velocity=displacement/Time

Question 5

Equations for average velocity

Answer 5

Total displacement/Total time
Or
Final velocity+initial Velocity/2

Question 6

Equation for acceleration/retardation (velocity)

Answer 6

Final Velocity-initial velocity/2

Question 7

What are the units for acceleration/retardation

Answer 7

M/s/s
Or
m/s^2 (squared)

Question 8

What goes on the y and x axis of a displacement time graph

Answer 8

Displacement on Y axis
Time on x axis
Gradient = the velocity

Question 9

Equation for weight

Answer 9

W=Mass *Gravity

Question 10

What is weight class as

Answer 10

The gravitational force acting on a mass

Question 11

What’s a scalar

Answer 11

Value without a direction

Question 12

What’s a vector

Answer 12

Value with a direction

Question 13

What is hooks law

Answer 13

The extension of a spring is directly proportional to the forces applied until the limit of proportionality

Question 14

What’s the equation to calculate hooks law

Answer 14

F=kE
Force= Konstant * Extension

Question 15

What goes on the x and y axis of a hooks law graph

Answer 15

Force on y
Extension on x
Gradient=k

Question 16

What is pressure defined as

Answer 16

Force exerted per unit of area

Question 17

Pressure equation

Answer 17

Pressure(N/cm^2 or N/m^2)=Force(N)/area(cm^2 or m^2)

Question 18

What is a moment

Answer 18

Measurement of the turning effect (when a force makes something spin) of a force

Question 19

What are the equations of a moment

Answer 19

f1d1=f2d2
Or
M= Force *distance to pivot

Question 20

What is the Centre of Gravity

Answer 20

Point through which the whole object can act upon

Question 21

What’s the equilibrium

Answer 21

State at which all forces are equal and object is balanced

Question 22

What’s the Law of Moments

Answer 22

For an object to be in equilibrium/balance the sum of the clockwise and the anti-clockwise moments must be equal about the same point

Question 23

What’s a way of showing the law of moments

Answer 23

CWM=ACWM
force x distance to pivot= force x distance to pivot

Question 24

What’s Newton’s first law

Answer 24

An object will continue at a constant speed or remain stationary if all forces are balanced (resulutant forces=0)

Question 25

What’s newtons 2nd law

Answer 25

Acceleration of an object is directly proportional to the resultant force and inversely proportional to the mass (1N will accelerate a mass of 1kg at a rate of 1m/s^2)

Question 26

What is the equation to calculate Newton’s second law

Answer 26

Forces = Mass*Acceleration

Question 27

What’s the definition of density

Answer 27

Amount of matter/mass in the unit of volume of a substance

Question 28

What’s density’s equation and units

Answer 28

Density(g/cm^3 or kg/cm^3) = mass(g or kg)/volume(cm^3 or m^3)

Question 29

Forces acting upon a fall

Answer 29

Weight pulling down to earth
Air resistance pulling up
(Resultant force will always be in favour of weight)

Question 30

Why does a parachute slow down a falling person

Answer 30

Drag force inc with the speed of the fall-drag forces becomes greatest force there for slowing down fall