Grade 8 Physics chapter 3

Moment is a quantity that tells turning effect of a force about turning point. 

• TRUE
• FALSE

What is the unit of force?

• Meter

• Centimeter

• Newton

A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?

• 7.5 Nm
• 1.5 Nm
• 750 Nm
• 150 Nm

What happens when two forces act in the same direction?

• They cancel each other out.
• The stronger one prevails.
• Their strengths are added.
• Their sum divided by the two is the total force.

What is the correct equation for calculating a force? 

• force = perpendicular distance x moment 
• force = moment / perpendicular distance
• force = perpendicular distance / moment

If these teams are pulling with the same amount of force what will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

What is the equation for Force?

• velocity x motion

• mass x acceleration

• kilograms x mass

• meters / seconds

If these boys are pulling with the same amount of force.  What will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

A moment of force cause an object to?

• Turn about fixed point

• Move forward

• Move backward

The turning effect of force on a door will be the highest when?

• Point far from the hinges and perpendicular

• Point near the hinges and perpendicular

• Point far from the hinges and parallel

• point near from the hinges and parallel