P8

Question 1

What is displacement?

Answer 1

A distance without a change in direction

Question 2

What is a vector

Answer 2

A physical quantity with size (magnitude) and direction

Question 3

What is a scalar

Answer 3

A physical quantity with size but no direction

Question 4

Give two examples of a vector quantity

Answer 4

Weight, acceleration, force, velocity, gravity

Question 5

Give two examples of a scalar quantity

Answer 5

Speed, distance, mass, time

Question 6

What is the difference between distance and displacement

Answer 6

Distance is a scalar quantity and displacement is distance without a change in direction and is vector

Question 7

What is the difference between speed and velocity

Answer 7

Speed is how fast you are going and is scalar. Velocity is the speed in a direction and is vector

Question 8

If you have a grid and need to show displacement between different points what do you do

Answer 8

Use pythagoras theorum

Question 9

What can a force do, name three

Answer 9

Change shape, change it’s movement and change it’s motion (accelarate, decelerate)

Question 10

What is a force in physics

Answer 10

A push or pull that acts on an object, this is measured in newtons

Question 11

What is a contact force?

Answer 11

A force that has to touch the object to act

Question 12

What is a noncontact force?

Answer 12

A4 doesn’t have to touch the object to act

Question 13

Give two examples of contact forces

Answer 13

Friction, air resistance

Question 14

Give two examples of noncontact forces

Answer 14

Gravity and magnetism

Question 15

What is Newton’s third law of motion?

Answer 15

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

Question 16

What is friction?

Answer 16

The force exerted by service against an object when it moves across it

Question 17

What is weight?

Answer 17

The force of gravity pulling things downwards. It makes
things fall, and keeps things on the ground

Question 18

What is upthrust

Answer 18

It pushes things upwards when they are in a liquid. It
pushes boats upward so that they do not sink.

Question 19

What is air resistance

Answer 19

It tries to stop things moving through the air. It pushes
leaves and parachutes upwards so that they fall slowly.

Question 20

What is a resultant force?

Answer 20

A single force that describes all the force operating on one object

Question 21

What is an unbalanced force?

Answer 21

When two forces in the opposite direction aren’t the same, so the object accelerates in one direction. E.g someone running

Question 22

What is a balanced force

Answer 22

When two forces on opposite sides on an object are balanced and so don’t accelarate and stay at the same speed or stop. E.g a plane cruising as it’s altitude doesen’t change

Question 23

What is Newton’s first law of motion?

Answer 23

If the resultant force acting on an object is zero, all the forces are said to be balanced

Question 24

What is the centre of mass?

Answer 24

The point where all the mass of the object is being concentrated

Question 25

How do you find the centre of mass of a regular object?

Answer 25

I’m putting the lines of symmetry and where the intersect is the centre of mass

Question 26

How do you find the centre of mass of an iregular object?

Answer 26

By drawing a straight line through the irregular shape, then turn the shape 90° and do the same thing, as before the point at which they both intersect is the centre of mass

Question 27

Why won’t a car topple over?

Answer 27

If the centre of mass is within the wheelbase

Question 28

How do draw a parallelogram of forces for vectors

Answer 28

By completing a shape where it’s lines don’t meet and has a line of symetery diagonally

Question 29

What is the first thing that you have to do when drawing a parallelogram of forces

Answer 29

Make a scale e.g 1 cm = 5n

Question 30

What is equilibrum

Answer 30

Where the forces are balanced ans so an object doesen’t move

Question 31

What is the resultant force of a balanced force

Answer 31

0

Question 32

How do you find the displacement between different points?

Answer 32

By using Pythagoras theorem, a2 + b2 =c2 (2’s are a power)

Question 33

When you’re representing a force what do you always have to show?

Answer 33

The direction of the force

Question 34

Describe the difference between a vector and scalar quantity

Answer 34

A vector quantity is something with a magnitude/ size that has a direction but a scalar quantity is something that has magnitude but no direction

Question 35

Name, three examples of scalar quantities

Answer 35

Speed, distance and mass

Question 36

Name, three examples of vector quantities

Answer 36

Weight acceleration and force

Question 37

Where does friction have to act?

Answer 37

On the surface/ground

Question 38

What are the sides opposite each other in drawing a parralelogram of forces

Answer 38

Opposite sides are the same length

Question 39

When drawing a parallelogram of forces, what does the overall angle of the parallelogram have to be?

Answer 39

180°

Question 40

What is vertical

Answer 40

A line straight up

Question 41

How do you find the horizontal and vertical components of a force?

Answer 41

Draw a horizontal and vertical axis, then a line in between the axis’ depending on the angle in the question and the newtons. Then draw a box around it, both components are on the bottom and left side