Mechanics: Equations

Question 1

Energy is measure in what units?

Answer 1

Joules, J

Question 2

Work is measure in what units?

Answer 2

Joules, J

Question 3

Weight is measured in what units?

Answer 3

Newtons, N

Question 4

Force is measure in what units?

Answer 4

Newtons, N

Question 5

Power is measure in Js^-1 or other what units?

Answer 5

Watts, W

Question 6

What units would be used in this formula P = E / t?

Answer 6

P in Watts (W), E in Joules (J) and t in seconds (s)

Question 7

What units would be used in this formula W = F x d?

Answer 7

W in Joules (J), F in Newtons (N) and d in metres (m)

Question 8

What units would be used in this formula E_K = ½m v²?

Answer 8

E in Joules (J), m in Kilograms (kg) and v in ms^-1

Question 9

What units and quantity would be used in this formula E_P = m g h?

Answer 9

E in Joules (J), g = 10m/s/s, h in metes (m)

Question 10

v = Δd/ΔT

What units are used in this formula?

Answer 10

v = ms^-1, d = m, metres, t = s, seconds

Question 11

F_net = ma

What are the units of this formula?

Answer 11

F in N, Newtons, m in kg, kilograms, a in ms^-1

Question 12

a = Δv/Δt

What are the units of this formula?

Answer 12

a in ms^-2, v, speed in ms^-1,t, time in s, seconds

Question 13

F_gravity = mg

What are the units and quantities of this formula?

Answer 13

F = N, Newtons, m = kg, kilograms, g = 10 ms^-2

Question 14

g = 10 ms^-2

What is g?

Answer 14

Acceleration due to gravity

Question 15

g = 10 N kg^-1

What is g?

Answer 15

The force per kg of mass

Question 16

What does F_net mean?

Answer 16

Net/overall force

Question 17

How do you convert kJ into J or kW into W?

Answer 17

Multiply by 1000

Question 18

To turn ms^-1 into km h^-1 what do you do?

Answer 18

Multiply by 3.6

Question 19

To turn km h^-1 into ms^-1 what do you do?

Answer 19

Divide by 3.6

Question 20

If accelerations = -4ms^-2, what is actually happening to the object?

Answer 20

It is decelerating

Question 21

In distance/time graphs the gradient of the line tell you what about the object?

Answer 21

Its speed

Question 22

On a distance/time graph the line is horizontal; what does this tell you about the object?

Answer 22

It is stopped/stationary

Question 23

Rise divided by run tells you what about the line on a graph?

Answer 23

The gradient

Question 24

The gradient of a speed/time line on a graph tells you what about the object?

Answer 24

Acceleration

Question 25

A horizontal line on a speed/time graph tells you what about an object?

Answer 25

The object is traveling at a constant speed

Question 26

The steeper the gradient of the line on a speed/time graph the....

Answer 26

Greater the acceleration

Question 27

In a speed/time graph area the below the graph equals...

Answer 27

The distance travelled

Question 28

Work done lifting an object is equal to....

Answer 28

E_P

Question 29

A rock falls from a cliff; just before it hits the ground all the E_P it has is transferred into what?

Answer 29

E_K Alter this formula m g h = ½ m v² To this g h = ½ v²

Question 30

Name the forces shown around this car.

Answer 30

Reaction Thrust Drag Weight

Question 31

What two contact forces are affecting the fall of the parachutist and how do they change his velocity?

Answer 31

The contact forces are drag and weight, drag slow the decent of the parachutist. [https://youtu.be/vZYwsAvHgVw](https://youtu.be/vZYwsAvHgVw)

Question 32

What is the formula for calculating Pressure?

Answer 32

P = F / A Pressure = Force / Area

Question 33

What are the units for Pressure where F is in N and A is in m²?

Answer 33

N m^-2

Question 34

F_W = mg What are the quantities and units of this formula?

Answer 34

F = N, Newtons m = kg, kilograms g is 10ms^-2

Question 35

To convert J to kJ or W to kW what do you do?

Answer 35

Divide by 1000

Question 36

P = F / A ## Footnote What are the units of this formula?

Answer 36

P = N m^-2 F = N A = m²

Question 37

Where P is Power... P = W/t What are the units?

Answer 37

P = W, Watts W = J, Joules t = s, seconds

Question 38

Power can be measured using two units; what are they?

Answer 38

Watts or Js^-1, Joules per second

Question 39

In Science the amount of material (matter) in an object is referred to as it...

Answer 39

Mass

Question 40

E_K is what energy?

Answer 40

Kinetic

Question 41

E_P is what kind of energy?

Answer 41

Gravitational potential

Question 42

In these formula v = Δd/ΔT and ΔE_P = mg Δh the Δ symbol means what?

Answer 42

Change in e.g. Change in distance, change in time, change in E_P

Question 43

The gravitational force of an object is called its what?

Answer 43

Weight