Forces
What forces are applied when you drive something forward and; drag something backwards?
Push and pull
*something* is a change in position of an object (moving)
motion
What exists when two objects are in contact?
Friction
*something* is a kind of inclined plane where the pointed edges are used to do work such as tightening, securing or holding
Wedge
What is the largest island in the world? (It is in Australia!!)
Fraser Island
What force rotates an object?
Twist
What is Newton's third law of motion?
For every action there is an equal and opposite reaction
When is friction useful?
Grip, change direction, slow down
*something* can raise weights or it can press of fasten objects
Screw
Australia is the *?* largest country in the world
6th
*something* forces can change the motion of an object by touching it
contact
What is Newtons second law of motion?
Force = mass times acceleration
Friction occurs when there are two objects in contact. This makes a what?
Contact force
Moving a motorbike into a truck would take a lot of effort. What simple machine would make this easier?
Inclined plane
What is the biggest land animal?
Elephant
*something* forces can change the motion of an object without touching it
non-contact
What is Newtons first law of motion?
An object will remain at rest unless acted upon by an unbalanced force. An object in motion continues in motion uncles acted upon by an unbalanced force
Why can friction at times be a problem?
It caused machines to heat up
Refer to the image on the board. Describe what is happening in both image A) and B)
A) Easier to move
B) Harder to move
What year did World War 2 start?
1939
*something* forces are equal forces acting in different directions on an object and;
*something* forces are different forces acting on an object.
balanced and unbalanced
What is Newton's first law of motion often referred to as?
"the law of inertia"
Types of friction:
An object at rest (not moving) has ...what?
Static friction
List all the types of simple machines
•Levers
• Gears
• Pulleys
• Inclined Plane
• Wedge
• Screw
What year did gold mining finish in Charters Towers?
1917