Gravity & Force

Question 1

Gravitational field

Answer 1

The region of space in which an object will experience a force due to gravity.

Question 2

Elestrostatic force

Answer 2

The force between 2 objects caused by a buildup of negative charges.

Question 3

Weight

Answer 3

A measure of gravitational pull on an object (N).

Question 4

Examples of contact forces

Answer 4

• Normal force
• Friction
• Air resistance

Question 5

Examples of Non contact forces

Answer 5

• Gravity
• Magnetic force
• Electrostatic force

Question 6

Sedimentation

Answer 6

The process of removing solid particles heavier than water by gravity force

Question 7

Movement

Answer 7

Living things can move on their own.

Question 8

Magnetic separation

Answer 8

the process of using magnets to separate particular objects with magnetic properties

Question 9

Emulsion, give an example

Answer 9

A colloid of 2 or more liquids one is a base, the other is broken into tiny droplets spread throughout.
eg. milk & butter

Question 10

Why do things weigh less on the moon?

Answer 10

because gravity is weaker on the moon and the force is weaker, therefore making things weigh less.

Question 11

Force

Answer 11

A force is a push or pull action upon an object.

Question 12

How are forces shown in the force diagram?

Answer 12

as arrows that show the direction in which the force is acting.

Question 13

Mass

Answer 13

mass is how many particles (atoms) make up an object. it is measured in kg

Question 14

Gravity

Answer 14

It is the force that pulls objects towards the centre of the earth

Question 15

Net force

Answer 15

The combination of all forces acting on an object.

Question 16

What is the gravitational field strength on earth?

Answer 16

9.8 N/kg

Question 17

On the moon, how many newtons is 1kg

Answer 17

1.6 N

Question 18

what is air resistance?

Answer 18

Air resistance is the forces opposite to the motion of an object as it passes through the air.

Question 19

When particles point in the same direction is called?

Answer 19

Domains

Question 20

What 6 things do objects do if forces are acting on them?

Answer 20

1. begin to move
2. speed up
3. slow down / stop moving
4. change the direction of motion
5. change shape
6. remain still

Question 21

Distance magnifiers

Answer 21

Distance magnifiers change a strong force that acts over a short distance, into a weak force that acts over a long distance.

Question 22

Wedge

Answer 22

2 inclined planes that move through another object and change the direction of a downwards force to a sideway force.

Question 23

Force magnifiers

Answer 23

force magnifiers can turn a weak force into a stronger force.

Question 24

How do Van de Graaff generators work?

Answer 24

In the shaft of the machine, two belts rub together making the rounded dome positively charged.