Section 8 - Forces And Their Effects

Question 1

How do objects interact?

Answer 1

By exerting forces in each other

Question 2

What kind of forces is there if the objects are touching?

Answer 2

Contact force

Question 3

What is a normal contact force?

Answer 3

A force that acts at right angles to the surface as a reaction to a force on the surface

Question 4

How is outburst balanced?

Answer 4

By a Non-contact force called gravity

Question 5

What does gravity occur between?

Answer 5

Any two objects that have mass

Question 6

Why does the moon stay in orbit around the earth?

Answer 6

Because two bodies are attracting each other

Question 7

What do we use to represent gravitational forces between two objects?

Answer 7

Vectors

Question 8

What are action reaction forces?

Answer 8

A pair of forces acting on different objects in different directions

Question 9

What is a force field?

Answer 9

The space around an object where it can affect other objects

Question 10

So why does the moon and earth attract each other?

Answer 10

Because the moon is within the earths gravitational field

Question 11

Name 2 forces that affect objects but are not in direct contact

Answer 11

Magnetism and static electricity

Question 12

Name 3 magnetic metals

Answer 12

Iron, Nickel and cobalt

Question 13

What is the space around a magnet where it can attract other magnets called?

Answer 13

Magnetic field

Question 14

What does an object charged with static electricity have?

Answer 14

An electric field

Question 15

What do two objects in an electrical field with the same charge produce?

Answer 15

A pair of forces that are equal in size and acting in opposite directions

Question 16

When is a force resultant (or net)?

Answer 16

If the forces are of equal size but in opposite directions

Question 17

Are the forces on a resultant force balanced?

Answer 17

Yes

Question 18

If a force is balanced, what resultant force does it have?

Answer 18

0

Question 19

What would you use to show forces on an aeroplane?

Answer 19

A free body force diagram

Question 20

What diagram do you use to work out a resultant force?

Answer 20

A scale diagram

Question 21

How do you draw a scale diagram?

Answer 21

Draw arrows at the correct angles to represent the forces (length of each arrow represents the size of force) / draw connecting lines to make a parallelogram / the resultant force is the diagonal of the parallelogram

Question 22

What does the length of the arrows in a free body force diagram show you?

Answer 22

The size of the force

Question 23

What can help a plane for example to climb when accelerating up?

Answer 23

Acceleration

Question 24

How can you work out how much thrust is pushing the plane, for example, upwards and how much is pushing it forwards by resolving the thrust force into two component forces at right angles?

Answer 24

Scale diagram

Question 25

What does resolving mean?

Answer 25

Representing a single force as two forces at right angles to each other

Question 26

What does component mean?

Answer 26

A part of something (eg. Lamp is a component in an electrical circuit)

Question 27

How do you draw a scale diagram to resolve forces on an aeroplane?

Answer 27

Draw a force arrow to scale at the correct angle / draw a rectangle with the sides in the directions you are interested in horizontal and vertical / resolved forces are the sides of the rectangle