Forces

Question 1

Characteristics of Forces

Answer 1

• A push/pull on an object
• Cant be seen (but felt)
• Symbol= F
• Unit= N (newtons)

Question 2

Effects of forces

Answer 2

• Changes speed of object
• Changes object direction
• Changes objects shape
• Bring object to standstill

Question 3

What is the function of forces

Answer 3

To change speed/direction/shape

Question 4

Spring balance

Answer 4

a balance that measures weight by the tension of a spring

Question 5

Explain force pairs and give examples

Answer 5

When a force is exerted on an object the object exerts an equal responding force in the opposite direction (book pushes down on table; table pushes book)

Question 6

what is a frictional force(contact force) and some characteristics

Answer 6

When objects rub together
,Stops things gliding past each other
,Produces heat
,Wears surface down

Question 7

What is applied force(contact & non-contact) + example

Answer 7

Pulling/tension/pushing/compression (pushing aa soccer ball)

Question 8

What is a normal force

Answer 8

When an object rests on a surface (Always 90° perpendicular to surface)

Question 9

Forces and pressure rule

Answer 9

The greater the area on which the force is applied, the smaller the pressure

Question 10

Explain Field Forces (non contact)

Answer 10

All objects with mass exert gravitational force, larger objects exert greater force, as objects move apart forces of attraction weaken

Question 11

Explain Force Field + give example

Answer 11

Region around object where force is felt (gravity)

Question 12

Mass to weight formula

Answer 12

w = m x g

Question 13

What’s the difference between mass and weight

Answer 13

mass is the amount of atoms in a material, while weight is a measure of how the force of gravity acts upon that mass

Question 14

what is weight measured in

Answer 14

Newtons (N)

Question 15

what is gravity measured in + on earth

Answer 15

m/s² , 9.8m/s²

Question 16

describe magnetic force (non-contact)

Answer 16

Can act through other materials
Force weakens as distance increases

Question 17

explain what ferromagnetic means

Answer 17

Materials that can be magnetized.

Question 18

explain magnetic poles

Answer 18

Magnetic force stronger at the end of the magnets , Opposite poles attract, Similar poles repel

Question 19

what is electrostatic force (non-contact) how does it work

Answer 19

When certain objects rub together they become charged
Friction between objects make electrons from one materials atom move to the others

Question 20

What is polarization + explain

Answer 20

When a positively charged rod is brought near to a neutral object. The positive protons are repelled & negative electrons are attracted = neutral object becomes polarized (has 1 positive & 1 negative)= attraction

Question 21

types of forces?

Answer 21

*applied force
*frictional force
*gravitational force
*drag force
*spring force
*magnetic force
*electric force
*tension force