WorksheetsTypes of Forces Review
Total questions: 53
Worksheet time: 50mins
A force that opposes motion between any surfaces that are in contact.
gravity
acceleration
friction
direction
When an object is moving at constant velocity, the net force acting on it is:
zero N
4 N
9.8 N
5.25 N
If a bowl is sliding across a table at a constant velocity, the force of kinetic friction (Fk) equals:
the applied force (Fapplied)
the normal force (Fn)
the net force (Fnet)
the force of static friction
the force of kinetic friction (Fk) = ?
the normal force (Fn) multiplied by the coefficient of kinetic friction
the normal force (Fn) divided by the coefficient of kinetic friction
the normal force (Fn) multiplied by the coefficient of static friction
mass x gravity
the normal force (Fn) of a dog sleeping on a couch = ?
the dog's mass multiplied by the force of gravity
the couch's mass multiplied by the force of gravity
the dog's mass divided by the force of gravity
the couch's mass divided by the force of gravity
A 20 kg minifridge resting on the floor requires a 120 N horizontal force to move it from rest. What is the coefficient of static friction between the minifridge and the floor?
0.61
0.51
0.49
0.69
If a 16 kg chair requires a 90 N horizontal force to keep it moving across the floor at a constant velocity, what is the coefficient of kinetic friction between the chair and the floor?
0.57
0.37
0.19
0.42
A 75 kg polar bear is sleeping on a frozen lake. What is the normal force of the polar bear?
735 N
65 N
395 N
650 N
Q13. The friction which occurs when the applied force overcomes static friction and the object starts moving is:
Static friction
Kinetic friction
Rolling friction
Sliding friction
What is teh relationship between the force of static friction and the force of kinetic friction between two surfaces?
Static frictional force is always greater.
Kinetic frictional force is always greater.
Static and kinetic frictional forces are always equal.
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
Weight=100N, Forcefriction=20N
μ=5.0
μ=0.2
μ=1.2
μ=0.1
An Orange falls off a tree and lands on the ground. What force caused the orange to fall?
friction
heat
gravity
wind
The support force exerted upon an object that is in contact with another stable object.
Gravity
Electrical Force
Normal Force
A force exerted by a compressed or stretched spring upon any object that is attached to it.
Spring Force
Tension Force
Elastic Force
As the hand pulls down on the mass, the spring constant _______, assuming that it doesn't pass the elastic limit of the spring.
increases
decreases
remains roughly constant
needs more information
Weight is a force that depends on mass and:
friction
gravity
magnetism
energy
Match description with free-body diagram.
A person in an elevator that is at rest.
A person in an elevator that is accelerating upwards.
A person in an elevator that is accelerating downwards.
A man standing on a scale in an elevator notices that the scale reads 40 newtons greater than his normal weight.
Which type of movement of the elevator could cause this greater-than-normal reading?
accelerating upward
accelerating downward
moving upward at a constant speed
moving downward at a constant speed
Your mass is 72 [kg]. What is your apparent weight (normal force) if you are in an elevator that is accelerating upwards at a rate of 9.8 [m/s/s]?
1411 [N]
0 [N]
706 [N]
353 [N]
The elevator is accelerating downwards at a rate of 2 m/s/s. What would the people in the elevator feel like?
Heavier than normal
Lighter than normal
Normal weight
Weightless
Which of these four motion maps shows an elevator that is not accelerating?
Which 2 of these 4 motion maps shows an elevator that is speeding up?
Which of these 4 motion maps shows an elevator that is slowing down?
moving or tending to move toward a center...
centripetal force
centrifugal force
Tangent
Curvature
A
B
C
D
Centripetal force is an acceleration of an object moving in circular path whose direction is _________________________of the circular path and whose magnitude is equal to the square of the speed divided by the radius.
towards the tangent
towards the centre
towards the minimum point
towards the maximum point
If an object is spinning around on a string and the string was suddenly cut, the object would move in a
curved path
straight line
Why does an object experiencing uniform circular motion have an acceleration?
because it ir changing speed
because it is changing direction
because it is moving n a straight line
because it has mass
The _______________________ supplies the centripetal force requirement for the car to move in a horizontal circle. Without it, the car would turn its wheels but would not move in a circle (as is the case on an icy surface).
friction force
centrifugal force
normal force
applied force
In this diagram, what do the red arrows represent?
the acceleration vector
the velocity vector
the centripetal force vector
the force of gravity
Which box experiences the greatest normal force?
A
B
C
they all experience same force
