Forces and motion : Introduction

Question 1

Unit of force

Answer 1

Newton (N)

Question 2

Tension force

Answer 2

Force transmitted through a length of rope pulled tightly by equal forces acting from both ends

Question 3

Friction force

Answer 3

The force between two surfaces which impedes motion and results in heating

Question 4

Upthrust

Answer 4

The upward push of a liquid or gas on an object

Question 5

Air resistance

Answer 5

A type of friction force that acts upon objects as they travel through air

Question 6

Water resistance

Answer 6

A type of fricition force that acts upon objects as they travel through water

Question 7

Gravitational force

Answer 7

Force of attraction between two seperated masses

Question 8

Relationship between gravitational force and mass

Answer 8

It gets larger as one or both objects get larger

Question 9

Why does a person experience a smaller force of gravity on the moon?

Answer 9

The moon has a smaller mass than earth

Question 10

Value of gravitational field strength / acceleration due to gravity

Answer 10

10

Question 11

Unit for gravitational field strength

Answer 11

N/Kg

Question 12

Unit for acceleration due to gravity

Answer 12

m/s^2

Question 13

What is weight?

Answer 13

The measure of the pull of gravity on an object

Question 14

Unit for weight

Answer 14

Newtons

Question 15

Weight equation

Answer 15

Weight = Mass * gravitational field strength

Question 16

What do we use to measure mass?

Answer 16

A beam balance or an electronic balance

Question 17

What do we use to measure weight?

Answer 17

A spring balance

Question 18

What is resultant force?

Answer 18

The single force that has the same effects as two or more forces

Question 19

What is a vector quantity?

Answer 19

A quantity that has both magnitude and direction

Question 20

What is a scalar quantity?

Answer 20

A quantity that has magnitude only

Question 21

What is a newton?

Answer 21

The force required to give a mass of 1Kg an acceleration of 1 m/s^2