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bảng tínhForce ,Pressure and Friction
Total câu hỏi: 20
Worksheet time: 10mins
What is a force?
push or pull on an object
push
pull
what is a magnitude?
The strength of a force is usually not expressed by its ---------
The strength of a force is usually expressed by its ---------
Force per unit called ------
pull
push
pressure
what is the man doing ?
pushing the car
pulling the car
all of the above
Muscular force is also called ___________ force
non contact force
contact force
gravitational force
A batsman hits the ball for a boundary past the bowler i.e. four runs. The batsman thus
Changes the direction & speed of the ball
Does not change the direction but speed only
Does not change the speed but direction only
Does not change either direction or speed
Pressure =
Area / force on which it acts
force / area on which it acts
Volume / force on which it acts
Force / volume on which it acts
If In a tug-o-war, when two teams are pulling a rope, and the rope does not move towards any team, it implies that
Equal force is being applied in the same direction
Equal Force is being applied in opposite direction
No force is applied in any direction
Cannot be explained
The sole of the shoes becomes plain after wearing it for several months. The reason is
Wearing out due to friction
Wearing out due to no friction
Sole is of bad quality
None of the above
Spring balance is a device used for measuring the _____________ acting on an object.
mass
pressure
force
none of these
A matchstick struck on a matchbox catches fire easily because
Friction may cause fire
Of chemical reaction
Force heated the match stick
None of the above
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
only if the objects are solid.
only if one of the two objects is liquid.
only if one of the two objects is gaseous.
irrespective of whether the objects are solid, liquid or gaseous
To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?
stone
plastic block
wooden block
glass block
During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is
force of gravity
force of friction
electrostatic force
magnetic force
Friction is
foe
friend
both (a) and (b)
none of these
Which of the following is proper example(s) to explain that force on an object may change its shape
A ball of dough rolled into chapati
Pressing a rubber ball kept on table
Making model using clay
All of the above
Which of the following is responsible for wearing out of bicycle tyres?
muscular force
magnetic force
frictional force
electrostatic force
A container is filled with water as shown in the given figure. Which of the following statements is correct about pressure of water?
Pressure at A > Pressure at B > Pressure at C
Pressure at A = Pressure at B = Pressure at C
Pressure at A < Pressure at B > Pressure at C
Pressure at A < Pressure at B < Pressure at C
Which of the following is not a smooth surface?
Surface of wet soap
Surface of tyres
Glazed tiles
Surface of mirror
Friction can be reduced by using
all of these
