Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics > P8 Forces in balance > Flashcards

P8 Forces in balance Flashcards

1
Q

Scalar quantities have…

A

Magnitude but no direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Vector quantities have…

A

Magnitude and direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Examples of scalar quantities (6)

A

Distance, speed, time, mass, energy and power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Examples of vector quantities (5)

A

Displacement, velocity, force, weight and momentum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is displacement?

A

Distance travelled in given direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the unit of force?

A

Newtons (N)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Examples of contact forces (2)

A

Friction and air resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is Newtons third law of motion?

A

When two objects interact with each other, they exert equal and opposite forces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the resultant force?

A

A single force that has the same effect as all the forces acting on an object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What happens to an object if the resultant force is zero?

A

The object stays at rest or stays at the same speed and direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What happens to an object if the resultant force is greater than zero?

A

The speed or direction of the object will change

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does a free body force diagram show?

A

All of the forces acting on a single object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is moment?

A

The turning effect of a force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the equation for moment?

A

Moment (Nm) = Force (N) x perpendicular distance to pivot (m)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How can you increase the size of the moment?

A

Increasing the magnitude of the force, increasing the perpendicular distance to the pivot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the force applied to a lever called?

A

The effort

17
Q

Explain what a force multiplier is and give an example

A

Something that increases the amount of force that you can place of an object, for example a lever

18
Q

What does a low gear do?

A

Gives a low speed and a high turning effect

19
Q

What does a high gear do?

A

Gives a high speed and a low turning effect

20
Q

What is the centre of mass of an object?

A

The point at which its mass can be thought of as being concentrated

21
Q

Where is the centre of mass for a flat object that is symmetrical?

A

Along the axis of symmetry

22
Q

What is the principle of moments?

A

The sum of the anticlockwise moments about any point = the sum of the clockwise moments about that point

23
Q

What is a parallelogram of forces?

A

A scale diagram of two vectors that can be used to find their resultant

24
Q

What does resolving a force mean?

A

Finding perpendicular components that have a resultant force that is equal to the force

25
Q

What is the resultant force for an object in equilibrium?

A

Zero

Physics (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions