Chapter 3

Question 1

5 types of forces

Answer 1

~Weight 
~contact force 
~friction 
~air resistance or drag 
~upthrust

Question 2

Weight force

Answer 2

The weight of an object is the pill of gravity on it, weight always acts vertically downwards

Question 3

Contact force for

Answer 3

When two objects touch, there is contact force, it is the force that stops you from falling through the floor

Question 4

Friction

Answer 4

Opposes motion. Think about the direction in which an object is moving (or trying to move)

Friction acts in the opposite direction

Question 5

Air resistance force

Answer 5

Is the force of friction when an object moves through water or air

Question 6

Upthrust Force

Answer 6

Is the upward push of a liquid or gas on a object.

Question 7

Resultant Force

Answer 7

Is the single force that has the same effect as two or more forces

Question 8

No resultant Force means

Answer 8

It will not accelerate, remaining at rest or constant speed

A = 0

Question 9

Mass

Answer 9

Is measured in kg, and tells you how much matter it is composed out off

Question 10

Weight

Answer 10

Of an object = the gravitational force that acts on it
Measured in N
Newton’s

Question 11

Weight equation

Answer 11

Mass X acceleration of free fall

Or

W = mg

Question 12

Acceleration due to gravity on earth in grams

Answer 12

= 10m/s^2

Question 13

What does the gravitational field cause

Answer 13

Objects to fall to the ground because they have weight

Earth is pulling downwards on their mass

Question 14

An object moving in circles

Answer 14

It will follow the rules of a tangent, always 90*

Force in forward direction and force always towards the middle of the circle

Question 15

Newton

Answer 15

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

Question 16

Force

Answer 16

The action of one body on a second body that causes its velocity to change

Force = mass X Acceleration
F=ma

Question 17

Quantity, symbol and si unit

Answer 17

Force - F - newton (N)
Mass - M - kilogram, kg
Acceleration - A - Metres per second squared, m/s^2

Question 18

Scalar quantities

Answer 18

Speed 
Mass 
Energy 
Density 
Temperature

Question 19

Vector quantities

Answer 19

Velocity
force
Weight
Acceleration

Question 20

Force, mass and acceleration

1 Main def in forces

Answer 20

The greater the mass of an object, the smaller the acceleration it is given by a particular force

Question 21

Terminal velocity

Answer 21

At terminal velocity, the object moves at a steady speed in a constant direction because the resultant force acting on it is zero.

Question 22

Impulse = momentum

Answer 22

Force x time

Question 23

Momentum = impulse

Answer 23

Mass x velocity

Question 24

Gravity

Answer 24

Is the force that exists between any two objects with a mass

10m/s2

Question 25

Acceleration

Answer 25

Force/mass