types of forces

Question 1

frictional force

Answer 1

-contact force which resists motion

-friction is produced Between two rough surfaces in contact because of irregularities and or projections on the surfaces

-results in wear and tear

-produces heat

-causes of friction: Friction is caused by points of contact on the surfaces. It is obstructing movement and by molecular forces of attraction at these points of contact

ways of reducing friction

-Makes surfaces smoother
-Use a loop to cut, such as oil or grease.
-Use wheels or rollers
-fitball bearings on axles
- streamline shapes of vehicles

Question 2

Magnetic force

Answer 2

• Force of attraction or repulsion between magnets.
• It is a non contact force.
• Unlike poles attract (attraction)

-Like poles repel (repulsion)

Question 3

gravitational force

Answer 3

The force of attraction between 2 objects.

its a non contact force.

Weight- Gravitational force acting on an object.

Mass- Amount of matter contained in a body.

Gravity on earth- 10 ms^-2

                         - no Nkg ^-1

Question 4

formulas

Answer 4

w= mg

Question 5

Electric force

Answer 5

The force between electric charges

It can either be a force of attraction or repulsion

It is none contact

Opposite charges attract

Like charges repel

Question 6

Tension

Answer 6

The pull in a stretched string rope or spring

Question 7

upthrust

Answer 7

The upward push exerted on an object imursed in liquid or a gas