basic knowledge

Question 1

what is a contact force

Answer 1

a contact force is any force that occurs as a result of two objects making contact with each other

Question 2

what is a non-contact force

Answer 2

A non-contact force is a force which acts on an object without coming physically in contact with it.

Question 3

what is a force

Answer 3

A force is a push or pull that acts on an object due to the interaction with another object.

Question 4

give 4 examples of a contact force

Answer 4

normal contact force, tension, air resistance and friction

Question 5

name 3 non-contact forces

Answer 5

gravitational force, electrostatic force and magnetic force

Question 6

what is a force measured in

Answer 6

newtons (N)

Question 7

motion is caused by what?

Answer 7

forces

Question 8

a physical quantity can be what?

Answer 8

measured

Question 9

what are the two types of quantity

Answer 9

scalar and vector

Question 10

magnitude is what?

Answer 10

the amount of a quantity eg height size or brightness

Question 11

what is a scalar quantity

Answer 11

a quantity with only magnitude and lacking in direction

Question 12

what is a vector quantity

Answer 12

a quantity with both magnitude AND direction

Question 13

which quantity has both magnitude AND direction

Answer 13

vector

Question 14

vector quantities are represented using a what?

Answer 14

an arrow

Question 15

The length of the arrow shows the ____

Answer 15

magnitude

Question 16

what is tension?

Answer 16

tension is a pulling force exerted on an object by a string, rope or rod

Question 17

Tension is a pulling force exerted on an object by a ____, ____ or ____

Answer 17

string, rope or rod

Question 18

what is friction?

Answer 18

friction is a force that acts between two touching surfaces and prevents or resists them moving against each other.

Question 19

when does an object experience air resistance?

Answer 19

when an object moves through the air it experiences air resistance. This force acts against the direction of movement.

Question 20

the more ____ an object is moving, the more air resistance it will experience

Answer 20

quickly

Question 21

what is upthrust?

Answer 21

Upthrust is an upwards force that acts on an object when it is in a fluid

Question 22

what is thrust?

Answer 22

Thrust is a driving force exerted by an engine to make an object move.

Question 23

what is a normal reaction force?

Answer 23

When an object pushes on a surface like a table, wall or the ground, the surface pushes back on the object with a balancing force.

Question 24

the normal reaction force always acts at ______ to the surface.

Answer 24

right angles

Question 25

when can friction be useful?

Answer 25

brakes on a bike

Question 26

when can friction be a nuisance

Answer 26

In the moving parts of the chain and gears of a bike

Question 27

what is magnetism?

Answer 27

attraction or repulsion that arises between electrically charged particles because of their motion

Question 28

what is an electrostatic force?

Answer 28

Electrostatic force is experienced by a charged particle in an electric field.This force can be either attractive or repulsive.

Question 29

what is gravitational force?

Answer 29

Gravitational force is experienced by a mass when it is sufficiently close to another mass.

Question 30

what force only ‘pulls’

Answer 30

gravitational force

Question 31

what 7 effects can a force have on an object?

Answer 31

make a body that is stationary to move
make a body that is moving to become stationary
decelerate the speed of a moving body
accelerate the speed of a moving body
change the direction of a moving body
change the shape of a moving body
change the size of a moving body

Question 32

what are forces measured by?

Answer 32

a newton meter

Question 33

what must be done to a newton metre before it’s used and why?

Answer 33

it must be set to 0 because otherwise a systematic error would occur and all your measurements will be inaccurate by the same amount