Forces

Question 1

What is the weak and strong nuclear force?

Answer 1

Weak: Can transform protons to neutrons and vice versa, acts at sub atomic level,
Strong: Acts at sub atomic level and holds nuclei of atoms together

Question 2

What is a force and what can it do?

Answer 2

A force is a push pull or a twist and it can change the speed, shape and direction of an object.

Question 3

Predict the effects of balanced and unbalanced forces.

Answer 3

An unbalanced force would make an object move. Eg: driving a car
An balanced force would make an object not move. Eg: Gravity and the ground pushing back up

Question 4

Brakes on a car or rubbing hands together are examples of…..

Answer 4

Friction (contact force)
Analysis:
Turning kinetic energy to heat

Question 5

investigate factors that influence the size and effect of frictional forces

Answer 5

1. The rougher the surface, the more friction

2. The shape of the object. Ie bullet less friction

Question 6

describe the behaviour of magnetic poles when they are brought close to each other

Answer 6

Like poles repel and unlike poles attract

Note: when drawing diagram of magnetic field, arrows come out from North and into South

Question 7

use the term ‘field’ in describing forces acting at a distance 7.3

Answer 7

Field is the area of influence that an object will experience an effect

Question 8

investigate how magnets and electromagnets are used in some everyday devices or technologies 7.3

Answer 8

Magnet: Bar magnet
Electromagnet: Car recycling

Question 9

describe how an object gains an electrostatic charge

Answer 9

Movement that causes electrons to jump from one thing to another.

Question 10

illustrate the electric field around charged objects

Answer 10

Positive heads out, negative heads in

Question 11

investigate the behaviour of charged objects when brought close together

Answer 11

If it was like charge it would repel and unlike would retract

Question 12

identify everyday situations where the effects of electrostatic forces can be observed

Answer 12

Electro static build up when walking across carpet

Question 13

describe situations where gravity acts as an unbalanced force

Answer 13

Car on a hill when release hand brake

Question 14

distinguish between mass and weight

Answer 14

Mass doesn’t vary anywhere in the universe and measured in kilos
Weight has a component of gravity and measured in Newtons (N)
Weight is a force

Question 15

Define buoyancy

Answer 15

The buoyancy force is the upward push on an object that is at least partially submerged in a fluid like a liquid or a gas.

Question 16

Define surface tension

Answer 16

The water particles have a force of attraction between them called cohesion. This force of attraction on the surface of water is called surface tension.

Question 17

Cohesive and adhesive forces

Answer 17

cohesive forces intermolecular attraction between molecules

adhesive forces force of attraction

Question 18

describe examples of technological developments that have reduced the impact of forces in everyday life

Answer 18

A helmet (to reduce impact forces)
Crumple forces on cars (to reduce impact forces)

Question 19

Identify forces acting around us

Answer 19

Gravitational, electrostatic, magnetic, weak and strong nuclear