General Physics (Forces, Pressure etc)

Question 1

What is pressure the result of?

Answer 1

A force acting on an area

Question 2

What is the equation for pressure?

Answer 2

P=F/A

Question 3

What are the units for pressure?

Answer 3

N/m^2 or Pascal

Question 4

Give 2 examples of pressure in everyday life

Answer 4

Clicking a button

Walking, as your shoes apply pressure to the ground

Question 5

How would you get a small pressure?

Answer 5

Spread the force over a large area

Question 6

How would you get a large pressure?

Answer 6

Spread the force on a small, concentrated area

Question 7

Does pressure increase or decrease with depth?

Answer 7

Increase

Question 8

What direction does pressure act in?

Answer 8

All directions

Question 9

What angle does pressure act at?

Answer 9

Right angles (90o)

Question 10

Why do liquids transmit pressure?

Answer 10

Because their molecules are free to move about

Question 11

What is another equation for pressure? (Think boats)

Answer 11

P=hgp (P is pressure, h is height from surface, g is gravitational potential and p is density of the liquid

Question 12

Give 2 examples of where a hydraulic jack is used

Answer 12

1) Trolley jack

2) Earth mover

Question 13

What does the moment (turning effect) of a force rely on?

Answer 13

It’s size and position

Question 14

What is the equation for moments?

Answer 14

Distance x force = moment

Question 15

What is the unit for moments?

Answer 15

NewtonMetres (Nm)

Question 16

What does the principal for moments state?

Answer 16

Clockwise moments = anti-clockwise moments

Question 17

What can moments of a force be increased by?

Answer 17

-increasing force applied

Question 18

What is the weight of an object called?

Answer 18

The Load

Question 19

What is the force someone applies called?

Answer 19

The effort

Question 20

What are other terms for the turning point?

Answer 20

The pivot or the fulcrum

Question 21

What are some examples of energy?

Answer 21

Chemical, kinetic, gravitational potential, elastic potential, electrical, thermal, light, sound and nuclear,

Question 22

What is work?

Answer 22

A quantity involving a force moving through a distance

Question 23

What is the equation for work done?

Answer 23

Force x distance = work done

Question 24

What unit is work measured in?

Answer 24

Joules

Question 25

What is energy?

Answer 25

The ability to do work

Question 26

What is gravitational potential energy?

Answer 26

The energy an object has due to it's position above earth

Question 27

What is the equation for gravitational potential energy?

Answer 27

GPE = m x g x h

Question 28

What is kinetic energy?

Answer 28

The energy an object has due to it's movement

Question 29

What is the equation for kinetic energy?

Answer 29

KE = 0.5mv^2 (m is mass, v is velocity)

Question 30

What is elastic potential energy?

Answer 30

The energy an object has because of it's change in shape or displacement of it's molecules

Question 31

What does Hooke's Law state?

Answer 31

As you add weights onto a spring, the spring will extend by and equal length each time a new weight is added on

Question 32

What does the Law of the Conservation of Energy state?

Answer 32

Energy can neither be created nor destroyed, it can ONLY be transferred into other forms

Question 33

Give some examples of energy transfers

Answer 33

- A torch, chemical energy gets converted to electrical energy which then transfers to heat and light energy - A pendulum, GPE to KE to GPE to KE to GPE and so on

Question 34

What is power?

Answer 34

The rate of doing work or transferring energy

Question 35

What is the equation for power?

Answer 35

Power = work done/time taken

Question 36

What are the units for power?

Answer 36

Watts

Question 37

What is efficiency?

Answer 37

How useful/unuseful an energy transfer is

Question 38

What is the equation for efficiency?

Answer 38

(Useful output/total input) x100

Question 39

What is the equation for momentum?

Answer 39

M = kg x m/s

Question 40

What is the conservation of momentum?

Answer 40

Momentum before = momentum after

Question 41

What is another equation for force?

Answer 41

F=M x DeltaV/T

Question 42

What is centripetal force?

Answer 42

A circular motion of an object around a point

Question 43

When does centripetal force take place?

Answer 43

When the speed is constant

Question 44

What is Boyle's law?

Answer 44

Pressure and volume before = pressure and volume after

Question 45

What is Brownian Motion?

Answer 45

The random 'jiggling' or motion of small particles