Chapters 1-4

Question 0

Define vector quantity?

Answer 0

Magnitude and direction, eg. Velocity.

Question 1

Define scalar quantity?

Answer 1

Magnitude but not direction, eg kelvin.

Question 2

Name 3 scalar quantities?

Answer 2

Kelvin, speed, joules

Question 3

Define velocity?

Answer 3

Velocity is the speed of something in a given direction.

Question 4

What does the gradient of a displacement time graph show?

Answer 4

Velocity away from the origin.

Question 5

Define acceleration and state whether it is a scalar or a vector?

Answer 5

Acceleration is the rate of change of velocity. It is a vector because it is change in velocity divided by time, and velocity is a vector.

Question 6

Define force?

Answer 6

Something that changes the motion of something else?

Question 7

Define mass?

Answer 7

A measure of the amount of matter within an object (kg).

Question 8

Define acceleration?

Answer 8

The rate of change of an object’s velocity.

Question 9

Define speed?

Answer 9

The rate of change of the distance moved by an object.

Question 10

Define projectile?

Answer 10

Any object thrown in the Earth’s gravitational field.

Question 11

Define displacement?

Answer 11

The distance moved by an object in a particular direction, measured from a fixed starting point.

Question 12

Define average speed?

Answer 12

The total distance travelled by an object divided by the total time taken.

Question 13

Define dynamics?

Answer 13

A study of motion involving force and mass.

Question 14

Define instantaneous speed?

Answer 14

The speed of an object measured over a very short period of time.

Question 15

Define uniform acceleration?

Answer 15

Acceleration that remains constant.

Question 16

Define uniform motion?

Answer 16

Motion of an object travelling with a constant acceleration.

Question 17

Define velocity?

Answer 17

The rate of change of the displacement of an object.

Question 18

Define weight?

Answer 18

The force on an object caused by a gravitational field acting on it’s mass.

Question 19

Define the newton?

Answer 19

The force that will give a 1kg mass an acceleration of 1m/s^2 in the direction of the force. 1N = 1kgms^-2

Question 20

Weight equation?

Answer 20

weight = mass x acceleration of free fall

Question 21

What is the gradient of a displacement time graph equal to?

Answer 21

Velocity

Question 22

Define displacement?

Answer 22

The distance travelled in a particular direction.

Question 23

What is the gradient of a velocity time graph equal to?

Answer 23

Acceleration

Question 24

What is the area under a velocity time graph equal to?

Answer 24

Displacement (or distance travelled)

Question 25

What are the 4 equations of motion?

Answer 25

V=u+at
S=(u+v)t/2
S=ut+0.5at^2
V^2=u^2+2as

Question 26

Define inertia?

Answer 26

A measure of the mass of an object. A massive object has a large inertia.

Question 27

What two forces are balanced at terminal velocity?

Answer 27

Weight and the upwards force (air resistance or drag)

Question 28

Define terminal velocity?

Answer 28

The constant velocity of an object travelling through a fluid. The net force on the object is zero.

Question 29

What is a newton?

Answer 29

Force required to give a 1kg mass an acceleration of 1m/s in the direction of the force (kgm/s^2)

Question 30

If a heavy stone and a light stone are dropped, which one will reach the ground first and why?

Answer 30

The heavier one - the weight is greater so it will reach a greater speed before air resistance is sufficient to equal it’s weight.

Question 31

Define centre of gravity?

Answer 31

A point where an objects entire weight appears to act. Tested for by hanging at different angles and finding centre vertical line.

Question 32

Weight = ?

Answer 32

Mass x gravitational field strength

OR

Mass x acceleration of free fall

Question 33

What does the Special Theory of Relativity state?

Answer 33

The mass of an object increase as it approaches the speed of light, so we can no longer use F=ma.