Energy and motion Flashcards Preview

BMAT: Physics > Energy and motion > Flashcards

Flashcards in Energy and motion Deck (23):
1

what is the difference between speed and velocity?

speed: scalar quantity with magnitude
velocity: vector quantity with magnitude and DIRECTION

2

formula for speed

distance/time

3

what does the gradient represent on a distance-time graph?

speed

4

what does a horizontal line represent on a distance-time graph?

stationary

5

formula for velocity

displacement of time

6

what does the gradient represent on a velocity-time graph?

acceleration

7

what does the area below line represent on a velocity-time graph?

total distance travelled

8

what does a horizontal line represent on a velocity-time graph?

constant speed

9

formula for acceleration and its units

change in velocity/time
unit: m/s^2

10

newton's 1st law

- zero resultant force - object remain stationary
- forces are balanced: constant velocity

11

newton's 2nd law

f=ma

12

newton's 3rd law

for every action, there is an equal and opposite reaction

13

what type of quantity is momentum?

vector quantity

14

formula for momentum

mass x velocity

15

units for momentum

kg m/s

16

how does a large force affect momentum?

causes a fast change in momentum so greater acceleration

17

formula for work done

force x distance moved in direction of force
E = fd

18

what is difference between mass and weight?

weight is caused by pull of gravitational force so varies on each planet, mass is how much stuff in inside remains same

19

formula for weight

weight = mass x gravitational field strength

20

gravitational field strength on earth and moon

earth: 10 N/kg
moon: 1.6 N/kg

21

what is gravitational potential energy?

energy which occurs due to its vertical position in a gravitational field

22

formula for gravitational potential energy

GPE= mass x g x height
GPE = mgh

23

formula for kinetic energy

KE= 1/2 x mass x velocity 2
KE = 1/2mv^2