GCSE - Topic 3 - Working Scientifically

Question 1

How does a greater distance or force effect a moment?

Answer 1

The greater the distance/moment, the greater the moment.

Question 2

What is a moment?

Answer 2

The turning effect of a force.

Question 3

What is the equation for a moment when given force and distance?

Answer 3

Force x Distance = Moment

Question 4

In a velocity-time graph, what does a straight, horizontal line mean?

Answer 4

The object is travelling at a constant speed.

Question 5

In a velocity-time graph, what does a straight, diagonal line going downwards mean?

Answer 5

It’s decelerating.

Question 6

In a velocity-time graph, what does a straight, diagonal line going upwards mean?

Answer 6

It’s accelerating.

Question 7

In a distance-time graph, what does a straight, horizontal line mean?

Answer 7

The object is stationary.

Question 8

In a distance-time graph, what does a diagonal line going upwards mean?

Answer 8

It’s going at a constant speed forwards.

Question 9

In a distance-time graph, what does a diagonal line going downwards mean?

Answer 9

It’s going at a constant speed backwards.

Question 10

What is a scalar quantity? (Definition)

Answer 10

Something that has a magnitude/size/quantity but no direction.

Question 11

What is a vector quantity? (Definition)

Answer 11

Something that has a magnitude and a direction.

Question 12

What is displacement?

Answer 12

The direction from the starting point and the length of a straight line from the starting point to the ending point.

Question 13

What is the law of moments?

Answer 13

If the anticlockwise moments equal the clockwise moments, the system will balance.

Question 14

How does the stiffness of a spring affect the spring constant?

Answer 14

The stiffer the spring, the greater the spring constant.

Question 15

What is the limit of proportionality?

Answer 15

The limit of proportionality refers to the point beyond which Hooke’s law is no longer true when stretching a spring.

Question 16

What is Hooke’s law?

Answer 16

The extension of a spring is directly proportional to the force applied, provided its limit of proportionality is not exceeded.

Question 17

What is the elastic limit?

Answer 17

The elastic limit of a material is the furthest point it can be stretched or deformed while being able to return to its previous shape.

Question 18

Weight

Answer 18

W = m x g

Where’s = Mr. G

Weight = Mass × Gravitational field strength (G)

Question 19

Work Done

Answer 19

W = F x s

Widow = Farted Stealthily

work done = force × distance along the line of action of the force

Question 20

Force Applied To a Spring

Answer 20

F = k x e

Fancy = kissing elvis

force applied to a spring = spring constant × extension

Question 21

Moment

Answer 21

M = F d

Mmmm! = Flour dumplings

moment of a force = force × distance

Question 22

Distance Travelled

Answer 22

s = v x t

Soft = Velvet Trolls

distance travelled = speed × time

Question 23

Acceleration

Answer 23

change in velocity = time x acceleration

a = ∆ v ÷ t

or

∆ v = a x t

Change V = at (taxes)

Question 24

What is mass?

Answer 24

The amount of matter in an object.

Question 25

What is weight?

Answer 25

The force acting on an object due to gravity.

Question 26

What type of quantity is displacement?

Answer 26

Vector.

Question 27

What type of quantity is velocity?

Answer 27

Vector.

Question 28

What type of quantity is distance?

Answer 28

Scalar.

Question 29

What type of quantity is speed?

Answer 29

Scalar.

Question 30

What type of quantity is force?

Answer 30

Vector.

Question 31

Define work done.

Answer 31

This occurs when a force moves an object for a distance.

Question 32

Units for work done?

Answer 32

Joules.

Question 33

State three factors that could affect a person's walking speed.

Answer 33

Age, fitness, terrain.

Question 34

State two ways in which friction on a moving object can be overcome.

Answer 34

Using a lubricant, smoother surfaces, make the object more streamlined.

Question 35

What is terminal velocity?

Answer 35

When the resultant force on an object is 0, so the object falls at a steady speed.

Question 36

What is the centre of mass of an object?

Answer 36

The point at which the mass may thought to be concentrated.

Question 37

What is the typical walking speed?

Answer 37

1.5m/s

Question 38

What is the typical running speed?

Answer 38

3m/s

Question 39

What is the typical cycling speed?

Answer 39

6m/s