Year 8 - Forces

Friction is a force that acts in an ___________ direction of movement.

• similar
• opposite
• parallel
• west

Which of the following is an example of friction that is helpful?

• Brakes used on a bike
• Tires from a car on the road
• Tread on the bottom of your shoes
• All are examples that are helpful

What is 'drag' another name for?

• dressing up
• air resistance
• friction
• weight

What is the name for a single force on an object with the same effect as all the forces combined?

• big
• total
• resultant
• sum

How can friction be reduced?

• reduce the force acting between the 2 surfaces
• reduce the roughness of the 2 surfaces coming in contact
• use wax, grease or oil
• all of the above are ways of reducing friction

Tags

NGSS.HS-PS2-3

Which materials do not break easily and return to their original shape when forces acting on them are removed?

• Brittle

• Elastic

• plactic

• strong

Robert Hooke investigates springs by seeing how a load affected their.....

• energy

• correlation

• temperature

• extension

Hooke's Law can be shown on a graph as...

• a straight line

• a smooth curve

• joining dots

• a sigmoid shape

Hooke's Law does not apply if....

• the spring is compressed

• The spring is stretched too far

• the spring is not made of steel

• masses are used instead of weights

the elastic limit is the point at which ..

• the spring snaps

• there is no more room to attach masses

• the spring does not return to its original size

• the spring unravels