Forces - Force Basics

Question 1

what are vector quantity’s

Answer 1

have magnitude and direction

e.g. force, velocity, displacement, acceleration and momentum

Question 2

what are scalar quantities

Answer 2

magnitude, no direction

speed, distance , mass temperate and time

Question 3

what is a force

Answer 3

a push, pull or twist on an object

Question 4

what is a contact force

Answer 4

objects have to be touching.

friction, air resistance, tension and normal contact force

Question 5

what are 3 examples of non contact forces

Answer 5

magnetic, gravitational, electrostatic

Question 6

what are 2 important effects of gravitational force

Answer 6

makes things accelerate towards the ground

gives everything a weight

Question 7

what is mass

Answer 7

the amount of stuff in an object. this will be the same value anywhere

Question 8

what is weight

Answer 8

force acting on an object due to gravity, caused by gravitational fields

Question 9

what does gravitational field strength depend on

Answer 9

stronger the closer to the mass causing the field and stronger for larger masses.

Question 10

what is the centre of mass

Answer 10

a point in the middle of a uniform object where u assume the mas is concentrated

Question 11

what is the equation for calculating weight

Answer 11

weight(N) = mass(Kg) x gravitational field strength (N/Kg)

Question 12

are weight and mass directly proportional

Answer 12

yes

Question 13

what is a resultant force

Answer 13

a single overall force which is the product of lots of forces

Question 14

what is a free body diagram

Answer 14

each force is represented by an arrow which is proportional to the size of the force

Question 15

what is a scale drawing

Answer 15

draw the forces as arrows proportionally to the size of the force tip to tail and in the correct direction. draw a line from the start of the first force to the end of the last force. this gives the length and direction of the resultant force

Question 16

what does it mean if the start and end point of a scale drawing is in the same place

Answer 16

object is in equilibrium.

0 resultant force

Question 17

how do you resolve a force

Answer 17

draw a horizontal line and vertical line to where the force is. add up the total length of these lines

Question 18

what is work done

Answer 18

the energy transferred when a force moves an object through a distance

Question 19

what is the equation for work done

Answer 19

w = Fs ( work done is force x distance)