physics

Question 1

define kinetic energy

Answer 1

kinetic energy is the energy stored in moving objects

Question 2

what is the equation for kinetic energy

Answer 2

Ek = 0.5 x m x v squared

Question 3

what is the equation for elastic potential energy

Answer 3

Ee = 0.5 x k x e squared

Question 4

define gravitational potential energy

Answer 4

the energy stored in an object due to it’s position above the earth’s surface

Question 5

what is the equation for gravitational potential energy

Answer 5

Ep = m x g x h

Question 6

what does ‘<’ represent

Answer 6

conventional current

Question 7

what does ‘>’ represent

Answer 7

electric current

Question 8

define current

Answer 8

an electric current is the flow of electric charge around a circuit

Question 9

how does current work in a series circuit

Answer 9

the current in a series circuit is never used up and the current is the same all the way around

Question 10

what is a network called

Answer 10

the national grid

Question 11

is air resistance a contact or a non contact force and why

Answer 11

contact force. This is because of the collisions between object and air particles

Question 12

what is the difference between scalar and vector quantities

Answer 12

scalar only has a magnitude and no direction.
vector has both magnitude and direction

Question 13

examples of scalar quantities

Answer 13

• speed
• temperature
• distance

Question 14

examples of vector quantities

Answer 14

• velocity
• displacement
• weight

Question 15

what is displacement

Answer 15

it is the distance moved in a straight line in a given direction from the staring point

Question 16

is power scalar or a vector and why

Answer 16

power is scalar and this is because it only has a magnitude and no direction