Forces revision

What are forces measured in?

• Kilograms

• Newtons

• Centimetres

• Litres

A wheel with teeth used to turn another gear wheel is a:

• Gear

• Axle

• Pulley

• Wheel

This is an example of:

• 1st class lever

• 2nd class lever

• 3rd class lever

• 4th class lever

Inertia is:

• The tendency to decelerate.

• The tendency to accelerate.

• The tendency to change direction.

• The tendency to resist any change in motion.

The amount of matter in a substance that is measured in kilograms. This is the definition of:

• Mass

• Weight

• Terminal velocity

• Gravity

Which of the following is true? Note: there might be multiple answers.

• Opposite ends attract

• Similar ends attract

• Similar ends are the same colour and symbol (N & S)

• Opposite ends repel

Which of the following forces need to be strongest for the plane to take off?

• Lift

• Thrust

• Weight

• Drag

Which is not a formula for a type of mechanical advantage?

• length of slope ÷ height of slope

• load ÷ effort

• weight of object ÷ mass of object

• Distance from effort to fulcrum ÷ distance from load to fulcrum

The ratio of a load force to the effort force by a machine, is the definition of:

• 1st class lever

• Mechanical advantage

• 2nd class lever

• 3rd class lever

Which of the following statements are true? Note: there might be more than one answer.

• The driving force on the car is the biggest, and the smallest is the air resistance

• The reaction force of both wheels are the same, and are larger than the driving force

• The friction caused by the tires is less than the driving force

• The forces are all the same