Effect of force and pressure

Which is not an effect of a force applied on an object?

• change in the state of rest or motion

• change in the size and shape

• change due to the turning effect

• change in weight

A force can change the speed of an object and change the ...................... in which the object moves.

The change in the motion of an object can be caused by ______ which can cause a moving object to slow down, and eventually come to a stop.

A force applied on an object can cause a turning effect about a fixed point called the ______.

• axle

• swivel

• spindle

• pivot

Which of the following does not make use of the turning effect of a force applied on an object?

• removing the lid of a tin can

• tightening a nut

• pumping air into a balloon

• opening a door

Pressure is defined as ..................

• force per unit area (P=F/A)

• force per unit volume

  (P=F/V)

• force per unit weight

  (P=F/W)

• force per unit length

  (P=F/L)

What is not a unit of pressure?

• N/m²

• Pascal (Pa)

• Newton

What is the SI unit of pressure?

• N/m2

• Pascal

• Newton

• Kilogram

(Given P=F/A) What happens to the pressure on the object when the area of contact with the object decreases while the force applied on the object remains the same.

• decreases

• increases

• remains the same

• increase at times and decreases at times

Which of the following does not make use of high pressure to make work more efficient?

• injection needles

• high-heeled shoes

• knife