Physics

Question 1

Displacement

Answer 1

Shortest distance from the initial to the final position (vector - magnitude and direction)

Question 2

Distance

Answer 2

total length of a path travelled (scalar - magnitude)

Question 3

Units of distance

Answer 3

meters (m)

Question 4

Units of displacement

Answer 4

meters (m) with direction

Question 5

Explain the difference between Distance and Displacement and give examples

Answer 5

Distance is the length of the path taken by an object whereas displacement is the simply the distance between where the object started and where it ended up.

Question 6

Speed

Answer 6

rate of change of distance (scalar)

Question 7

Velocity

Answer 7

rate of change of displacement (vector)
Velocity is defined as the rate of change in displacement of an object or particle with respect to time.

Question 8

Speed calculation

Answer 8

distance/time = speed

Question 9

Unit of speed

Answer 9

m/s

Question 10

Unit of velocity

Answer 10

m/s + direction

Question 11

Difference between speed and velocity

Answer 11

Velocity applies to displacement only and speed applies to distance only

Question 12

Instantaneous speed

Answer 12

speed at a specific instant in time

Question 13

Average Speed

Answer 13

is calculated by dividing the total distance covered by the body to the total time taken by the body.

Question 14

Acceleration

Answer 14

Acceleration is a measure of the rate at which an object’s velocity changes.

Question 15

Acceleration Unit

Answer 15

m/s^2

Question 16

What is classified as acceleration

Answer 16

Speed Up
Slow down (Negative acceleration)
Change Direction

Question 17

How to calculate acceleration

Answer 17

change of velocity ÷ time taken

Question 18

Reaction time definition

Answer 18

The time taken to initiate a response to a stimulus

Question 19

Momentum Definition

Answer 19

The product of an object’s mass and velocity

Question 20

Newton’s first law of motion

Answer 20

An object at rest will remain this way unless it is acted upon by a force. An object that is moving will continue to move at the same speed and in the same direction unless an unbalanced force acts upon it. eg a car moving forward until break is applied.

Question 21

Inertia

Answer 21

The tendency to resist any change in motion is called an object’s inertia.

Question 22

Newton’s Second Law

Answer 22

the acceleration of an object is directly related to the net force and inversely related to its mass

Question 23

Example of newtons second law

Answer 23

If you use the same force to push a truck and push a car, the car will have more acceleration than the truck, because the car has less mass.

Question 24

Formula for force

Answer 24

Force = mass x acceleration (f=ma)

Question 25

Newtons third law + example

Answer 25

Newton's thirds law states that for every force, there is an equal and opposite reaction force. This occurs during contact between the racquet and the ball.

Question 26

Distinguish between mass and weight

Answer 26

Mass is the amount of matter in an object, measured in kilograms (kg), and remains constant regardless of location. Weight is the force exerted by gravity on an object, calculated as mass × gravitational acceleration (9.8 m/s²), and is measured in newtons

Question 27

Describe Kinetic energy and give an example

Answer 27

Kinetic energy is the energy of movement such as a ball rolling forwards

Question 28

Describe Potential energy and give an example

Answer 28

Potential energy is stored energy or energy that has not yet taken place but has potential. Such as a ball being held at a distance but not falling.

Question 29

Describe Gravitational energy and give an example

Answer 29

Gravitational energy is the energy stored in an object due to its position above the earth's surface. A roller-coaster at a peak

Question 30

Describe Elastic Potential Energy and give an example

Answer 30

Potential energy stored as a result of deformation of an elastic object, such as the stretching of a spring

Question 31

formula for kinetic energy

Answer 31

1/2 x mass x velocity squared

Question 32

Formula for Potential energy

Answer 32

PE= mass x gravity x height

Question 33

What is energy Efficiency

Answer 33

Energy efficiency simply means using less energy to perform the same task - that is, eliminating energy waste.

Question 34

What is the law of conservation of energy

Answer 34

that energy cannot be created or destroyed but transferred and transformed

Question 35

Energy efficiency formula

Answer 35

(Useful output energy/total input energy) x 100

Question 36

Describe how energy transfers and transformations are never 100% efficient

Answer 36

This is because energy can dissipate which mean part of the transformation of energy becomes unusual to the object.

Question 37

What is a force

Answer 37

A force is a push or pull upon an object resulting from the object's interaction with another object.

Question 38

what is net force

Answer 38

the sum of all forces acting on an object

Question 39

Work Force and Power

Answer 39

Work is the energy needed to apply a force to move an object a particular distance. Power is the rate at which that work is done.