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WorksheetsFriction Review
Total questions: 20
Worksheet time: 16mins
Friction is an example of _____________
contact force
non contact force
both of these
none of these
The direction of force of friction is always _____ to the direction of motion
same
opposite
unchanged
none of these
Without friction, an object in motion would never stop.
true
false
The rouugher the surface, the faster an object will travel over the surface
true
false
How would the absence of friction affect a marble travelling on a long, straight path?
the marble's speed would decrease
the marble would remain at a constant speed
the marble's speed would increase
the marble would stop immediately
Rough surfaces have _________
greater friction
less friction
the same level of friction
When we rub our hands together _________.
frictional force works between them
energy is released
our hands become warm
all off the above
The amount of friction depends on the normal force of the objects pressing together.
True
False
FN=100N, Ff=20N
μ=5.0
μ=0.2
μ=1.2
μ=0.1
When looking at friction problems, if the net force in the x-direction on an object is zero, what can we say about its acceleration?
it is positive
it is negative
it is zero
not enough information is given
Normal force is
Always opposite the weight
Always parallel and down the incline
Always perpendicular to the surface
It depends on the direction of motion
This bag is being pulled up without being moved. Which equation describes the forces?
Fg = Fhand - FN
FN = Fg + Fhand
Fhand = FN - Fg
Fg= FN + Fhand
You put your suitcase on the scale. The scale read 22.6 kg. You push down a little on the bag and the scale reads 25.2 kg. The magnitude of the normal force is .....
25.2 kg
252 N
226 N
24.7 N
