Grade 11 revision

all free fall objects have the same

• acceleration

• weight

• volume

• temperature

the work exerted by the boy is

• positive

• negative

• zero

• none of them

the work exerted by friction is always

• positive

• negative

• zero

• all of them

•For an object tossed into the air, ................... regardless of whether the object is thrown upward or downward or just dropped.

• it has a free fall and acceleration is the same

• the acceleration is different

• a free fall is impossible

• none of them

the pressure in equilibrium with a liquid phase is called

• equilibrium vapour pressure

• constant vapour pressure

• true vapour pressure

• reid vapour pressure

True or false: The word fall in free fall does not mean that the object is necessarily moving downward

• true

• false

• not given

• both 2 and 3

Steam burns are more severe than burn produced by water

• true

• false

• not given

• both 2 and 3

You move a 12-newton box 6 meters across the floor. How much work have you done?

• 72 J

• 77 J

• 80 J

• 86 J

320 joules of work were done by a force of 80 newtons. Over what distance was the force applied?

• 4 m

• 5 m

• 8 m

• 6 m

A box required 800J of work to lift 5 meters off the ground. How many newtons did the box weigh?

• 160 N

• 109 N

• 124 N

• 100 N