P8

Question 1

What is a Vector

Answer 1

A vector quantity has magnitude and direction

Question 2

What is a scalar

Answer 2

A scalar quantity only has magnitude

Question 3

3 examples of scalar quantities

Answer 3

Mass distance speed

Question 4

3 examples of vector quantities

Answer 4

Displacement momentum force

Question 5

What is force

Answer 5

Push or pull on an object that it caused by it interacting with something

Question 6

2 types of forces

Answer 6

Contact non-contact

Question 7

What is a contact force

Answer 7

When 2 objects have to be touching for the force to act

Question 8

3 examples of contact force

Answer 8

Friction, air resistance, tension in ropes

Question 9

What is non contact force

Answer 9

Object that do not need to be touching in order for the forces to act

Question 10

3 examples of non contact forces

Answer 10

Magnetic force, gravitational force, electrostatic force

Question 11

What is a resultant force

Answer 11

Overall force on a point or object

Question 12

What happens if a resultant force moves an object

Answer 12

Work is done

Question 13

When resultant force isn’t 0

Answer 13

Energy is transfered and work is done on the object

Question 14

Equation for work done

Answer 14

Force x distance (Fs)

Question 15

How does an object bend, compress or stretch

Answer 15

The object needs more than 1 force acting on the object

Question 16

How is an object elastically deformed

Answer 16

If it can go back to it’s original shape

Question 17

How can an object be inelastically deformed

Answer 17

If it can’t return to it’s original shale

Question 18

When is work done in force of an object

Answer 18

When a force stretches or compresses an object causing energy to be transfered to the elastic potential energy store of the object

Question 19

Equation linking spring constant, force, extension

Answer 19

Force = spring constant (N/m) x extension(m)

Question 20

What is weight

Answer 20

The force acting on an object due to gravity

Question 21

What is the gravitational field strength on earth (GCSE)

Answer 21

10N

Question 22

How to calculate weight

Answer 22

Mass (kg) x gravitational field strength

Question 23

What unit is weight in

Answer 23

Kg

Question 24

A man on a bike traveled 4N north and 3N east. Calculate final magnitude direction of resultant force

Answer 24

5N at 37°

Question 25

What does it mean to be equalibrium

Answer 25

The forces acting on an object add to get 0

Question 26

Magnitude

Answer 26

Size of a quantity

Question 27

Newtons third law of motion:

Answer 27

States that when 2 objects interact, they exert equal and opposite forces on each other

Question 28

Example of newtons third law:

Answer 28

A boxer who punches a bag with a force of 100N experiences an equal and opposite force of 100N from the bag

Question 29

Driving force:

Answer 29

The force that makes a vehicle move

Question 30

What happens when a car moves forward?

Answer 30

-The force of the friction of the road on the tyre is in the forward direction -the force of the friction of the tyre on the road is in the reverse direction

Question 31

Equal and opposite forces (example):

Answer 31

Two roller skaters pull on opposite ends of a rope. The skaters move towards eachother because they pull each other with equal and opposite forces

Question 32

Why does a tractor pull a car out of the mud

Answer 32

- a rope is attached to the car from the back of tractor - the force of the mud on the tractor is greater than the force of the mud on the car - these forces are not equal and opposite to each other

Question 33

Newtons first law of motion:

Answer 33

If the forces acting on an object are balanced, the resultant force is zero

Question 34

Example of newtons first law:

Answer 34

When a heavy crate is pushed across a rough floor at a constant speed without changing its direction, the push force on it is equal in size and acting oppositely to the friction on the crate

Question 35

Example of an unbalanced force:

Answer 35

When a jet plane is taking off, the thrust force of its engine is greater than the firce of air resistance on it

Question 36

What are Force diagrams?

Answer 36

A diagram that shows the forces acting on an object without any other objects or other forces shown

Question 37

The centre of mass of a symetrical object?

Answer 37

For a flat object that is symmetrical, the centre of mass is along the axis of symmetry

Question 38

Where is the centre of mass on an object?

Answer 38

The point where the mass is most concentrated

Question 39

What happebs when an object is freely suspended?

Answer 39

It comes to rest with its centre of mass directly underneath the point of suspension

Question 40

The paralellogram of forces:

Answer 40

-A scale diagram of two force vectors -is uses to find the resultant of two forces not on the same line

Question 41

How are the sun and earth attracted to eachother

Answer 41

Gravitational force

Question 42

Example of a contact force in action:

Answer 42

A chair exerts a force against the ground, while the ground pushes back at the chair with equal force

Question 43

What does the weight of an object depend on?

Answer 43

The strength of the gravitational fields at the location of the object (This means the weight of an object deoends on its location)

Question 44

What is force acting from?

Answer 44

A single point on the object, called its centre of mass

Question 45

What is used to measure weight?

Answer 45

A calibrated spring balance

Question 46

What do free body diagrams show?

Answer 46

All the forces acting on an object

Question 47

What is resultant force?

Answer 47

Overall force acting on a point or object

Question 48

What happens if a resultant force moves an object?

Answer 48

Energy is tranferred and work is done

Question 49

Example of work done:

Answer 49

When you push something along a rough surface, you are doing work against frictional forces

Question 50

When is an object in equilibrium?

Answer 50

If the forces on it are balanced