Forces

1. 1.Which is the definition of a simple machine?

• They have one or two parts.

• Simple machines usually do not have moving parts.

• All the answers are correct.

2.Which are the main forces acting on a moving car

• Buoyancy, thrust, drag

• Gravity, friction, thrust

• Draft, friction and trust.

3- Which are the simple machines.

• Pulley, inclined plane, level and wheel

• Puley, plane, axel

• Pulley, inclined plane, wheel

4. 4.Which is the force of the plane that pull it.

• Gravity

• Trust

• Draf

5. 5.Which is the force that pulls a ship downwards

• Thrust

• Buoyancy

• Gravity

6.Which is the backwards force of a car?

• Thrust

• Friction

• Drag

7.Which is the force of gravity in a plane

• Gravity

• Weight

• Lift

8.Which is the principle that explains the buoyancy

• Archimedes

• Tales

9. 9. Which are the types of engine used to move a car

• Electric motor

• Petrol motor

• Diesel motor

• All answers are correct

10. 10. When a plane take off...

• Lift must be greater than weight

• Lift must be less than weight

• Trust must be less than drag