Mechanics- Physics

Question 1

Define- contact force

Answer 1

Force between two objects that are touching

Question 2

Define- non contact force

Answer 2

Force between two objects that are not touching

Question 3

An example of a non-contact force

Answer 3

Gravity/weight force, magnetism

Question 4

An example of a contact force

Answer 4

Friction, air resistance/drag, thrust, push/pull

Question 5

Define- balanced forces

Answer 5

Opposite forces that are of equal size

Question 6

Define- unbalanced forces

Answer 6

Opposite forces of unequal size

Question 7

Define- resultant/net force

Answer 7

The overall force acting on an object

Question 8

Define- friction

Answer 8

Force that always acts to oppose motion or attempted motion

Question 9

Define- air resistance (drag)

Answer 9

Friction force caused by air moving over an object

Question 10

Define- average speed

Answer 10

The rate of change of distance travelled OR how fast you change your distance travelled in a certain amount of time (m/s or ms-1)

Question 11

Define- deceleration

Answer 11

A decrease in speed

Question 12

Define- acceleration

Answer 12

The rate of change of speed OR how fast you change your speed in a certain amount of time (m/s2 or ms-2)

Question 13

Define- constant speed

Answer 13

Speed remains the same over a period of time

Question 14

Define- weight

Answer 14

The downward force caused by gravity on an object, measured in Newtons (N)

Question 15

Define- mass

Answer 15

The amount of matter that makes up an object, measured in kilograms (Kg)

Question 16

What is the mass formula?

Answer 16

M= F/A (mass= force divided by acceleration)

Question 17

What is the acceleration formula?

Answer 17

A=F/M (acceleration= force divided by mass)

Question 18

What is the force formula?

Answer 18

F=MA (force= mass multiplied by acceleration)

Question 19

What are some factors that influence friction?

Answer 19

The surface/contact area, the size and mass of the object

Question 20

What are some factors that influence friction?

Answer 20

The surface/contact area, the size and mass of the object

Question 21

Which has the least and most friction?

Answer 21

Air has the least friction and rough concrete has the most

Question 22

What is the formula for average acceleration?

Answer 22

A= change in v/change in t (average acceleration= change in velocity divided by change in time)

Question 23

What is CUTLASS?

Answer 23

C- crosses
U- units
T- title
L- label axis
A- axis scale
S- straight line (with ruler) or smooth curve
S- size

Question 24

Define- displacement

Answer 24

How far we have travelled in a certain direction OR how far we’ve travelled from where we started

Question 25

Define- velocity

Answer 25

Speed with a direction

Question 26

What is the unit of force?

Answer 26

Newtons (N)

Question 27

Define- forces

Answer 27

A force is a push or pull

Question 28

What are the units used for acceleration?

Answer 28

ms-2

Question 29

Define- velocity

Answer 29

Velocity is the speed of an object plus its direction.

Question 30

What factors can increase acceleration?

Answer 30

Air resistance, thrust, mass etc

Question 31

Where do you put time on a graph?

Answer 31

The bottom (x axis)

Question 32

What does the triangle mean?

Answer 32

A “change in”

Question 33

Out of speed and velocity which is the vector/scalar quantity?

Answer 33

Speed is called a scalar quantity and velocity is a vector quantity.