Forces

Question 1

What are the types of forces?

Answer 1

Contact:
- friction
- elastic force

Non-contact:
- gravitational force
- magnetic force

Question 2

What are the advantages and disadvantages of friction?

Answer 2

Advantages:
- enables movement without slipping
- allows the application of brakes to stop a moving vehicle to prevent accidents

Disadvantages:
- causes wear and tear
- loss of useful energy to heart and sound energy
- produces a lot of heat

Question 3

What is elastic force?

Answer 3

Elastic force is the force acting on a stretched or compressed elastic object to return it to its original shape.

Question 4

What is gravitational force?

Answer 4

Gravitational force is the force that attracts objects towards planets

Question 5

What is magnetic force?

Answer 5

Magnetic force refers to the attractive or repulsive forces between magnets

Question 6

What is a Maglev train?

Answer 6

Magnetic + levitation

Magnetic force of repulsion lifts the Maglev train slightly above the track, allowing it to levitate on air and travel along the track. This greatly reduces friction between the track and the train, allowing the train to travel at a higher speed.

Question 7

What is the gravitational field?

Answer 7

Gravitational field is a region in which a mass experiences a force due to gravitational attraction and its strength is the gravitational force acting per unit mass

Question 9

Mass vs Weight
(definition, type, SI unit, measuring tool, gravity, equation)

Answer 9

Mass:
- the amount of matter in an object
- not a force
- kg
- electronic balance
- independent

Weight:
- gravitational force acting on an object
- a type of force
- newton
- Extension spring balance
- dependent
- mass x gravitational field strength