Forces

Question 1

What is a SCALAR QUANTITES

Answer 1

Only have a magnitude and no direction

Question 2

What are examples of SCALAR QUANTITIES

Answer 2

Speed
Mass
Distance 
Time
Temperature

Question 3

What is a VECTOR QUANTITIES

Answer 3

Have a magnitude and a direction

Question 4

What are 5 examples of VECTOR QUANTITIES

Answer 4

Force
Displacement 
Momentum 
Velocity 
Accerleration

Question 5

What is the definition of FORCE

Answer 5

A push or pull on an object caused by it intertracting with something.

Question 6

What are the two types of forces?

Answer 6

Contact forces

Non-contact forces

Question 7

What is the defintion of a CONTACT FORCE

Answer 7

Forces that occur by two or more objects touching

Question 8

What is the definition of a non-contact force

Answer 8

Forces that occur between two or more objects that are not touching

Question 9

What are 4 examples of a contact force

Answer 9

1) Friction
2) Tension
3) Air resistance
4) Normal contact force

Question 10

What are 3 examples of non-contact forces

Answer 10

1) gravitaional force
2) electrostatic force
3) magnetic force

Question 11

What is the definition of weight

Answer 11

A force that acts on an object due to gravity

Question 12

What is the equation to calculate weight

Answer 12

W = mg

Weight(N) = mass(kg) x gravitational field strength(N/kg)

Question 13

What is the definition of a free body diagram

Answer 13

Shows all forces acting on an isolated object (taken from the centre of mass)

Question 14

What is the definition of equilibrium

Answer 14

When the forces acting on an object are balanced and the resultant force is zero.

Question 15

What is the definition of a resultant force

Answer 15

A single force that can replace all the forces acting on an object and give the same effect as the original forces acting together.

Question 16

How do you calculate the resultant force

Answer 16

Add forces pointing in the same direction together. subtract forces pointing in the opposite direction

F1 - F2 = resultant force

Question 17

What is the definition of work done

Answer 17

When a force moves an object from one point to another, energy is transferred and work is done the object.

Question 18

What is the equation of work done

Answer 18

W = Fs

Work done(J) = Force(N) x Distance(M)

Question 19

What is the definition of distance

Answer 19

Distance is a scalar and it measures how far an object has moved (not including direction)

Question 20

What is the definition of Displacement

Answer 20

Displacement is a vector that measures the distance and direction in a straight line from the starting postion to the finishing position of an object.

Question 21

What is the definition of speed

Answer 21

Speed is a scalar that measures how fast your going with no regard to direction

Question 22

What is he equation of speed

Answer 22

s = vt

distance travelled(m) = speed(m/s) x time(s)

Question 23

What are 4 things that can affect a persons walking, running or cycling abilities

Answer 23

1) ability
2) age
3) distance travelled
4) type of ground

Question 24

What are the average speeds for walking, running, cycling and sound

Answer 24

1) 1.5 m/s
2) 3 m/s
3) 6 m/s
4) 330 m/s

Question 25

What is the definition of velocity

Answer 25

velocity is a vector and it measures speed with a certain direction

Question 26

What is the defintion of acceleration

Answer 26

The change in velocity in a certain amount of time

Question 27

What is the equation for acceleration

Answer 27

acceleration(m/s*2) = change in velocity (m/s) / time(s)

Question 28

What is deceleration

Answer 28

Deceleration is negative acceleration (shows an object slowing down)

Question 29

What is the acceleration of an object falling due to gravity close to Earth’s surface

Answer 29

roughly 9.8 m/s*2

Question 30

What is the definition of inertia

Answer 30

The tendency of an object to continue in the same state of motion

Question 31

What is Newtons first law explained

Answer 31

1) if zero resultant force acts on a stationary object, the object doesnt move 2) If zero resultant force acts on a moving object, it continues moving at the same velocity. 3) If a non-zero resultant force acts on an object, object accelerates or decelerates ( will change speed, direction or both)

Question 32

What is the definition of Newtons first law

Answer 32

An object will remain at rest or travel at a constant velocity unless it is acted on by a resultant force above zero

Question 33

What is the definition of Newtons second law

Answer 33

The acceleration of an object is directly proportional to the resultant force acting on it, and inversely proportional to its mass

Question 34

What is the equation used within Newtons second law

Answer 34

F = ma

Question 35

What is the definition of inertial mass

Answer 35

Measure of how hard it is to change an object’s velocity. Its the ratio of force over acceleration: m = f/a

Question 36

What is the definition of Newtons third law

Answer 36

Two interacting objects exert equal and opposite forces on eachother

Question 37

What is the definition of friction

Answer 37

A force that acts to oppose an objects motion. it always acts in the opposite direction to movement.

Question 38

What is the definition of Drag

Answer 38

The frictional force caused by any fluid on a moving object (e.g air resistance)

Question 39

What is the definition of terminal velocity

Answer 39

When the result force acting between the weight and drag acting on a falling object is zero (balanced)

Question 40

What is the average reaction time of a person

Answer 40

between 0.2 - 0.9 seconds

Question 41

What are four factor affecting reaction times

Answer 41

1) tiredness 2) drugs 3) alcohol 4) distractions

Question 42

What is the investigation for reaction time

Answer 42

The ruler drop test

Question 43

What is the stopping distance equation

Answer 43

stopping distance = thinking distance + braking distance

Question 44

What are two factors that increase thinking distance

Answer 44

1) faster vehicle speed | 2) slow driver reaction times

Question 45

What are four factors that increase braking distance

Answer 45

1) faster vehicle speed 2) wet or icy weather 3) poor road surface 4) damaged or worn brakes or tyres

Question 46

What is the definition of the conservation of momentum

Answer 46

In a closed system, total momentum before an event (e.g collision) equals total momentum after an event

Question 47

What is the equation for momentum

Answer 47

p = mv ``` p = momentum (Kg m/s) m = mass (Kg) v = velocity (m/s) ```