Physics

Question 1

Whats the equation that links work done, force and distance

Answer 1

W=FxD

J. N. M

Question 2

Whats the equation that links weight, mass and gravitational field strength

Answer 2

Weight=mass x gravitational field strength

N. Kg. N/kg

Question 3

An equation that links a change in objects gravitational potential energy store, weight and change in height

Answer 3

Change in gravitational potential energy store = weight x change in height

Question 4

An equation that links kinetic energy , 0.5/ 1/2, mass, speed2

Answer 4

Ek=0.5 x mass x v2

Question 5

An equation that links Power, energy transferred, time taken

Answer 5

Power(W) = energy transferred (J)/ time taken (s)

Question 6

An quation that links density, mass and volume

Answer 6

D = mass / volume

Question 7

An equation that links moments, force, distance

Answer 7

F. X. D (m)

Question 8

Moments in equilibrium

Answer 8

M1 = M2

F1 x D1 = F2 x D2

Question 9

Suvat equations

Answer 9

V=s/t. a=v2 - u2/t. v2 - u2 = 2as

Question 10

An equation that links resultant force, mass, acceleration

Answer 10

Rf = m x a. Actual equation = F=m x a

N. Kg M/s2

Question 11

What equation links force applied to a spring, spring constant, extension ( high - low )

Answer 11

F = k x e

Question 12

What is the conservation of momentum?

Answer 12

In a closed system, the total momentum before an event is equal to the total momentum after an event

Question 13

Efficiency calculation

Answer 13

Efficiency = useful output energy transfer / total input energy energy

Question 14

Whats the equation for elastic potential energy?

Answer 14

Ee = 0.5 * k* e2

Question 15

What is the equation for g.p.e?

Answer 15

Ep = mgh

Question 16

Whats the equation that links Power, word done ( energy ) and time?

Answer 16

P = W/t

Question 17

What are the 8 energy stores?

Answer 17

• Thermal
• Kinetic
• Gravitational Potential
• Elastic potential
• Chemical
• Magnetic
• Electrostatic
• Nuclear

Question 18

What are the 4 energy transfers?

Answer 18

Mechanically ( by a force doing work ), heating , eletrically ( work done by moving charges ), radiation ( sound, light )

Question 19

Can energy be destroyed? Conservation of energy principle

Answer 19

No but it can be trasferred usefully, stored or dissapated, but can never be created or destroyed.

Question 20

What is power ( w )

Answer 20

Power is the rate of doing work - how much per second

1W = 1j of energy transfer per second

Question 21

What is useful and wasted energy?

Answer 21

Useful energy = energy transferred to place that it is wanted in the way that it is wanted
Wasted energy = the energy that has not been usefully transferred

Question 22

Efficiency calculation 2

Answer 22

effeciency = usefull power output / total power input x100

Question 23

An equation that links momentum, mass and velocity

Answer 23

Momentum = mass x velocity

Question 24

An equation that links Force, mass, change in velocity and time taken

Question 25

Pressure in solids equation

Answer 25

Pressure = force / area

Question 26

Pressure in liquids

Answer 26

Pressure = height x density x gravitational field strength

P=h x p x gfs

Question 27

How do you calculate energy?

Answer 27

Energy = power x time