JC Forces

What instrument is used to measure a force needed to move an object?

• Einstein meter

• Newton meter (also called spring balance)

• Boyle meter

• Watson meter

Define friction

• Slows things down

• Needs oil

• Force because of sandpaper

• Force that opposes motion

Give two advantages of friction

• Ability to walk

• See objects clearly

• Brakes to slow down an object when required

• Carry sound waves

Give two disadvantages of friction

• Heat up our hands

• Wears down engine parts

• Limits top speeds

• Turns objects grey

What is Hooke's Law?

• The extension of a spring is directly proportional to the force applied.

• The rate of change of a body's momentum is proportional to the force and takes place in the direction of the force.

• To every action there is an equal but opposite reaction.

• The rate of change of velocity.

Who discovered gravity?

• Alexander Graham Bell

• Leonardo Di Vinci

• Isaac Newton

• Rosalind Franklin

If the mass of a book is 3 Kg. What does it weigh?

• 3 Kg

• 30 N

• 3 N

• 30 Kg

What force is required to give a car of mass 1000 Kg an acceleration of 2 m/s/s?

• 2000 N

• 500 N

• 2 N

• 998 N

What term is defined as:

a measure of the force of gravity on an object ?

• mass

• volume

• gravity

• weight

Hooke's Law:

The extension of a spring is ...

• inversely proportional to the applied force

• directly proportional to the applied force