Forces

Question 1

definition of a force

Answer 1

a push or a pull

Question 2

a force is a vector.. what is does something need in order to be called a vector

Answer 2

a magnitude and direction.

Question 3

forces act in pairs.. what does this mean?

Answer 3

for every action there is an equal and opposite reaction.

Question 4

definition of a contact force

Answer 4

where two objects are in contact with one another

Question 5

3 examples of contact forces

Answer 5

friction
tension
compression

Question 6

definition of non- contact forces

Answer 6

non - contact forces act over a distance and do not involve two objects touching on another

Question 7

3 examples of non contact forces

Answer 7

gravitational force
magnetic force
electrostatic force

Question 8

what is another term for non - contact forces?

Answer 8

field forces

Question 9

friction definition

Answer 9

Friction- when two Resistive forces make physical contact

Question 10

tension definition

Answer 10

Force transmitted through a medium (usually rope, cable, string etc) when pulled tight by forces acting from opposite ends (in opposite directions).

Question 11

compression definition

Answer 11

Force(s) pressing inwards on an object causing it to become compacted.

Question 12

gravitational force definition

Answer 12

Attractive (pulling) force that objects exert on each other that is dependent on the mass of the objects and the distance between their centres.

Question 13

magnetic force definition

Answer 13

Force that two magnetic materials exert on each other over a distance.

Question 14

two types of magnetic forces

Answer 14

attraction

repulsion

Question 15

what is attraction in the context of magnetic force

Answer 15

is a pulling force between unlike poles of a magnet.

Question 16

what is repulsion in the context of magnetic force

Answer 16

is a pushing force that like poles exert on each other.

Question 17

what is the definition of electrostatic force

Answer 17

Electrostatic force- Force that two electrically charged objects exert on each other over a distance.

Question 18

how to objects become charged

Answer 18

Through friction between two objects (insulators) electrons are transferred from one object to another. The object that gains electrons is negatively charged and the object that loses electrons becomes positively charged.

Question 19

Electrostatic potential energy

Answer 19

electrostatic potential energy could be the energy of attraction between oppositely charged objects or repulsion between like charges. This potential energy could be converted into other types of energy such as kinetic energy when they move towards or away from one another.
Unit of energy = joule (J)