forces in balance

Question 1

what is a vector quantity?

Answer 1

a vector quantity has a magnitude. size and direction.

Question 2

what is a scalar quantity

Answer 2

a scalar quantity has a magnitude size but no direction.

Question 3

what are some examples of vector quantities? (3)

Answer 3

force.
velocity.
momentum.

Question 4

what are some examples of scalar quantities?

Answer 4

speed.
distance.
mass.

Question 5

how are vectors represented?

Answer 5

with an arrow thats size and direction represent magnitude and direction.

Question 6

what is a force?

Answer 6

a push or pull on an object caused by an interaction with something.

Question 7

what are the 2 types of forces?

Answer 7

contact.
non contact.

Question 8

what is a contact force?

Answer 8

a force that acts when 2 objects are touching. such as friction or air resistance

Question 9

what is a non contact force?

Answer 9

a force that acts when objects are not touching. such as gravity or magnetic forces

Question 10

what is an interaction pair?

Answer 10

a pair of forces that are equal and opposite. on 2 interacting objects

Question 11

what is gravitational force?

Answer 11

a force of attraction between masses. gives things weight

Question 12

what is mass?

Answer 12

the amount of matter in an object.

Question 13

what is weight?

Answer 13

the force acting on an object due to gravity.

Question 14

what is the formula for weight?

Answer 14

weight newtons = mass kg x gravitational field strength N/kg

Question 15

what does a free body diagram show?

Answer 15

all the force acting on an object or system. arrows represent the size of a force

Question 16

what is a resultant force?

Answer 16

the overall force on an object.

Question 17

what happens when a force moves an object?

Answer 17

work is done. mechanically

Question 18

what is the formula for work done using force?

Answer 18

work done jules = force newtons x distance m

Question 19

what is a scale drawing used for?

Answer 19

it helps you work out the resultant force.

Question 20

how do you draw a scale drawing?

Answer 20

1. draw a scale drawing of the forces acting 1cm = 1N for example
2. join the 2 point of the forces looks like a triangle
3. measure the length of the joining line for the force and measure the angle. for a bearing

Question 21

what does it mean if an object is in equilibrium?

Answer 21

its forces are balanced. resultant force is 0

Question 22

what does it mean to resolve a force?

Answer 22

split the force into horizontal and vertical components. up/down left/right

Question 23

what can happen if you apply more than one force to an object? one is bending

Answer 23

1. bending.
2. stretching.
3. compression.

Question 24

what is an elastic object?

Answer 24

an object that can be elastically deformed. returns to its original shape and length

Question 25

what does inelastically deformed mean?

Answer 25

an object doesn't return to its original shape and length.

Question 26

what is the formula for force using extension?

Answer 26

**force** *newtons* **= spring constant** *N/m* **x extension** *m*

Question 27

what is a moment?

Answer 27

the turning effect of a force.

Question 28

what is the formula for a moment?

Answer 28

**moment** *Nm* **= force** *newtons* **x distance of force from pivot** *m*

Question 29

what are 2 force multipliers?

Answer 29

lever. gear.