Chapter 8 - Forces

Question 1

What is distance?

Answer 1

Distance is a scalar measurement which contains how far your travel

Question 2

What is displacement?

Answer 2

Displacement measures distance from starting point and direction

Question 3

What is Newton’s first law?

Answer 3

Newton’s First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.

Question 4

The force you apply to a spanner has a what effect on the nut?

Answer 4

Turning

Question 5

What does a vector measurement contain?

Answer 5

Magnitude information, eg speed, distance

Question 6

What is a vector measurement?

Answer 6

A vector value contains magnitude and direction, for example velocity or displacement.

Question 7

What is the centre of mass?

Answer 7

the centre of mass of an object is:

• the point at which it’s mass can be thought of as being concentrated.
• the point through which a single force on the body has no turning effect.
• the point about where it’s mass is evenly distributed.

Question 8

What is the principal of moment?

Answer 8

The moment of as force is a measure of the turning effect of the force on an object.

Question 9

Principal of moments equation:

Answer 9

The sum of all the clockwise moments about any point = the sum of all the anti-clockwise moments at that point

Question 10

What is the moment equation?

Answer 10

moment = force x distance

Question 11

What is a force scale diagram?

Answer 11

a diagram which contains vector values.

the direction indicates directional information

the length indicates the magnitude

Question 12

The longer the lever handle the larger the _____ force

Answer 12

Turning

Question 13

How can you increase the moment of a force?

Answer 13

Increasing the size of the force

Using a spanner with a longer handle

Question 14

What is the weight of an object called?

Answer 14

The load

Question 15

What is the force a person applies to the object called?

Answer 15

Effort

Question 16

What is a balanced force?

Answer 16

A balanced force is a force which is even on each side of a given object

Question 17

What is the point about which the crowbar turns called?

Answer 17

Pivot

Question 18

What is the line that a force acts along called?

Answer 18

Line of action

Question 19

If an object’s force is balanced and it is traveling at a certain velocity, how will it be affected as time goes by?

Answer 19

The object will continue to travel in the original velocity

Question 20

What is the moment of a force equation?

Answer 20

Moment, M = force, F * perpendicular distance
from the line of action
of the force to the pivot, d

Question 21

What is an unbalanced force?

Answer 21

An unbalanced force is when an object’s resultant force is not equal to 0

Question 22

Gears are like levers because they can __________ the effect of a turning force

Answer 22

Multiply

Question 23

Why use a parallelogram?

Answer 23

The parallelogram of forces is used to find the resultant of two forces that do not acts along the same line.

Question 24

What is a resultant force?

Answer 24

The resultant force is the sum of multiple forces on an object

Question 25

What direction is the weight of an object coming from?

Answer 25

It is a force acting down

Question 26

What is Newton’s third law?

Answer 26

For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.

Question 27

The gear wheels exert ________ and ____________ forces on each other

Answer 27

Equal and opposite

Question 28

What is the direction of the force of wheels on a road

Answer 28

A backwards direction the the car’s velocity

Question 29

Gears are used to change the _________ of a _________ _______

Answer 29

Moment of a turning effect

Question 30

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