C9 Forces Self-Check Quiz

Match the following

• gravitational force

• pulling a block over a surface

• frictional force

• rain falling from the sky

• elastic force

• climbing rope

• magnetic force

• Maglev train

Weight is the same as mass.

• True

• False

Answer explanation

Weight is the measure of gravitational force acting on an object while mass is the amount of matter in an object.

Match them!

• N
• Measuring instrument for force (weight)
• Pa

• S.I. unit of Weight
• spring balance

• Measuring instrument for mass
• kg
• S.I. unit of Mass
• electronic balance

• S.I. unit of Pressure

The greater the gravitational field strength, the greater the mass.

• True

• False

Answer explanation

Earth is bigger than moon and has a greater gravitational field strength, as such, we weigh heavier on earth than on the moon.

Contact force

• frictional force

• gravitational force

• elastic force

• magnetic force

non-contact force

• frictional force

• gravitational force

• elastic force

• magnetic force

A force cannot change the

• direction of a moving object.

• mass of an object.

• shape of an object

• size of an object.

Which effect of a force is shown in this diagram?

• changes size of object

• changes shape of object

• turning effect

• changes pressure of object

Answer explanation

Prying open a lid, a see-saw, opening a door (with hinges) are all examples of the turning effect of a force.

The higher the ........................ .................... in contact, the lower the pressure exerted on a surface.

Abby's shoe size is larger than that of Matty.

Who exerts the highest pressure on the ground, assuming their weight are the same?

• Abby standing on one foot

• Abby standing on both feet

• Matty standing on one foot

• Matty standing on both feet