Force

Question 1

What is force

Answer 1

Force is a push or pull that acts in a certain direction

Question 2

Action reaction pairs of forces always have what

Answer 2

Have the same magnitude
Act in opposite direction
Never cancel one another as they act on different objects

Question 3

What is a force field

Answer 3

When a force is exerted on an object without actually touching it

Question 4

What are the different type of force fields

Answer 4

Magnetic field, gravitational force, electrostatic force

Question 5

What is a magnetic, gravitational and electrostatic force field caused by.

Answer 5

Magnetic: any magnet
Gravitational: anything with mass
Electrostatic: any charged object

Question 6

What is a magnetic, gravitational and electrostatic force field exerted on

Answer 6

Magnetic: any magnetic material
Gravitational: any object with mass
Electrostatic: any object with a charge

Question 7

What type of force is is a magnetic, gravitational and electrostatic force field

Answer 7

Magnetic: attraction or repulsion
Gravitational: attraction
Electrostatic: attraction or repulsion

Question 8

What is another word for gravitational force

Answer 8

Weight

Question 9

What does the strength of the gravitational force depend on

Answer 9

It depends on the mass of an object and the distance between the objects

Question 10

What is the difference between mass and weight

Answer 10

Mass:
•A measure of the quantity of matter that an object has
•unit is kilogram
•measured using a triple beam balance scale
•never changes

Weight
•the downward force of gravitational attraction exerted by the earth and an object
•unit is Newton
•measured using a spring scale or spring balance
•depends on where the object is

Question 11

What is the formula for gravitation force

Answer 11

Fg (gravitational force/ weight) = m (mass) x g (acceleration due to gravity)

Question 12

What is the amount of acceleration due to gravity

Answer 12

9,8 m/s downwards

Question 13

What is a vector quantity

Answer 13

Something that has magnitude and direction

Question 14

What are the effects of force

Answer 14

Motion, distortion, direction, rotation

Question 15

What are balanced forces

Answer 15

have equal magnitudes but act in opposite directions. They CANCEL each other out and the overall effect is zero. (We say that there is a RESULTANT FORCE or net force of zero).

Question 16

What are unbalanced forces

Answer 16

do not completely cancel each other out so they have an overall effect on the body

Question 17

What is the difference between balanced and unbalanced forces

Answer 17

Balanced forces have an overall net force of zero and unbalanced forces have an overall net force of more than zero

Question 18

What is Newton’s third law

Answer 18

Forces always act in pairs

Question 19

What is gravity

Answer 19

The force of attraction that the earth exits on all objects. It acts vertically downwards towards the centre of the earth

Question 20

What is the difference between contact and non contact forces

Answer 20

Contact forces exert a force on a object by touching it while a non contact force exerts a force on a object without actually touching it

Question 21

How do you draw a free body diagram

Answer 21

With a dot

Question 22

How do you draw a force diagram

Answer 22

With a square

Question 23

What are the types of forces you can use when drawing a force diagram

Answer 23

Fn- normal force (upward arrow) 
Fg- gravitational force (downwards arrow) 
Ff- friction force (arrow to the left) 
Fa- applied force (to the right) 
Ft-tensile force 
Fair- air resistance