Y8 Forces in Action (Forces Recap)

What is a lever?

• asimple machine, a flexible object that can rotate.
• a simple machine, a rigid object that can rotate.
• a complex machine, a flexible object that can rotate.
• a complex machine, a rigid object that can rotate.

What is a moment?

• the turning effect of a force.
• the turning effect of a lever.
• the turning effect of a pivot.
• the spinning effect of a force.

How could you increase the moment of a force? (pick 2)

• increase the force.
• move closer to the pivot.
• increase the perpendicular distance from the force and the pivot.
• decrease the force.

What is the correct equation for calculating the moment?

• moment = force ÷ distance

• moment = distance ÷ force

• moment = force × distance

• moment = force + distance

Rearrange the equation to make force the subject

• force = moment ÷ distance

• force = distance ÷ moment

• force = moment × distance

• force = moment + distance

Rearrange the equation to make distance the subject

• distance = force ÷ moment

• distance = moment ÷ force

• distance = force × moment

• distance = force + moment

What are the units for moment?

• newtons (N)
• newtons per metre (N/m)
• newton metres (N m)
• metres (m)

How does a crane balance the load?

• using a really long arm
• skilled crane operator
• only picking up small loads
• using a counterweight

What is the correct equation for calculating pressure?

• pressure = force ÷ area

• pressure = area ÷ force

• pressure = force × area

• pressure = area + force

What are the units for pressure?

• pascals (Pa)
• newton metres (N m)
• metres squared (m²)
• newtons (N)