Physics

Question 1

Uniform Motion

Answer 1

used to describe object that is traveling at a constant rate of motion in a straight line.

Question 2

Distance, speed, time formula

Answer 2

s x t = d, d/t = s, d/s = t

Question 3

What is the slope of a line on a distance-time graph equal to?

Answer 3

the average speed of the object

• greater slope = faster speed
• smaller slope = slower speed

Question 4

Speed-time graph

Answer 4

• If the line is horizontal/has a slope of zero, the speed is constant
• Area under speed time graph indicates the distance it travelled

Question 5

Scalar quantity

Answer 5

A scalar quantity has magnitude (size, “how much”) only, but no direction.
- Eg: time, mass, speed

Question 6

Vector quantity

Answer 6

A vector quantity has both magnitude and direction.

- Eg: displacement, velocity, and force

Question 7

Distance travelled

Answer 7

Measurement of the change in distance of an object moving from a starting reference point

Question 8

Displacement

Answer 8

A measurement of the change in distance and the direction or the change in position of an object from a reference

Question 9

Average velocity

Answer 9

A vector quantity has both magnitude and direction.

Question 10

Acceleration

Answer 10

A change in velocity

Question 11

Force

Answer 11

A push or pull on an object

Question 12

Positive Acceleration

Answer 12

both the change in the magnitude and the direction of the velocity are positive

Question 13

Negative Acceleration

Answer 13

the change in magnitude of the velocity is negative while the direction is positive

Question 14

Acceleration formula

Answer 14

(V final-V initial)/time

Question 15

Balanced Force

Answer 15

Equal in magnitude but opposite in direction.

Question 16

Unbalanced Force

Answer 16

one force is greater in magnitude than the other or is not in the opposite direction
- If the force is in the opposite direction of the movement the object will decelerate

Question 17

Force formula

Answer 17

Mass x acceleration

Question 18

Conditions for work

Answer 18

• Movement
• Force
• Force and distance must be in same direction

Question 19

Energy

Answer 19

The ability to do work

Question 20

Chemical Energy

Answer 20

The potential energy stored in chemical bonds of compounds

Question 21

Electrical Energy

Answer 21

Work done by moving electrons

Question 22

Nuclear Energy

Answer 22

Energy stored in the nucleus of an atom

Question 23

Solar Energy

Answer 23

Energy of the sun

Question 24

Thermal Energy

Answer 24

The energy of an object due to movement of atoms

Question 25

Kinetic Energy

Answer 25

Energy of a moving object

Question 26

Gravitational Potential Energy

Answer 26

The energy of an object has because it has been raised above the Earth’s surface

Question 27

Potential Energy

Answer 27

Energy that is potentially used to do work

Question 28

Potential Energy Formula

Answer 28

MGH (mass x acceleration due to gravity x height)

Question 29

Kinetic Energy Formula

Answer 29

½mv^2

Question 30

Mechanical Energy

Answer 30

When energy is transferred to an object, it can cause a change in both kinetic and potential energy simultaneously.

Question 31

Law of Conservation of Energy

Answer 31

Energy cannot be created or destroyed, but it can be converted from one form to another

Question 32

Useful Energy

Answer 32

Desired energy to do work

Question 33

True or False: It is possible for a system to have an efficiency of 100%

Answer 33

False, efficiency of a system will never reach 100%

Question 34

Efficiency

Answer 34

Measurement of how effectively a machine converts energy input into useful energy output.