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WorksheetsPhysics Unit 3 - Dynamics (Practice Test)
Total questions: 25
Worksheet time: 3hrs 40mins
What is the SI unit for force?
Grams (g)
Hectogram (Hg)
Newtons (N)
Meters (m)
Calculate the net force.
60N, Left
40N, Right
0N
60N, Right
Which of the following laws states that for every action there is an equal and opposite reaction?
The law of conservation of momentum
Newton's 1st Law of Motion
Newton's 2nd Law of Motion
Newton's 3rd Law of Motion
What happens to the inertia of an object if its mass increases?
It decreases.
It remains constant.
It increases then decreases
It increases
An object at rest will remain at rest, and an object in motion will continue in motion at constant velocity unless acted upon by an unbalanced force.
Newton's First Law
Newton's Second Law
Newton's Third Law
If you weigh 574 N on Earth, what would you weigh on the Moon (g = 1.60 m/s2)?
93.6 N
58.5 N
359 N
918 N
If you weigh 610 N on Earth and 920 N on planet X, what is the acceleration due to gravity on planet X?
14.8 m/s2
6.57 m/s2
13.9 m/s2
15.2 m/s2
If you are standing on a scale in an elevator and the elevator is accelerating upward, your apparent weight would _______ relative to your actual weight.
increase
decrease
be unchanged
If you are standing on a scale in an elevator and the elevator is accelerating downward, your apparent weight would _______ relative to your actual weight.
increase
decrease
be unchanged
If you are standing on a scale in an elevator and the elevator is traveling at a constant speed, your apparent weight would _______ relative to your actual weight.
increase
decrease
be unchanged
A leaf falls from a tree and lands on the sidewalk. Identify an action-reaction pair in this situation.
The tree exerts a force on the leaf; the sidewalk exerts a force on the leaf.
The leaf exerts a force on the sidewalk; the sidewalk exerts a force on the leaf.
The leaf exerts a force on the tree; the sidewalk exerts a force on the leaf.
The leaf exerts a force on the sidewalk; the tree exerts a force on the leaf.
A newton is equivalent to which of the following quantities?
kg
kg·m/s
kg·m/s2
kg·(m/s)2
The normal force on an object always acts _______.
perpendicular to the surface
parallel to the surface
opposite to the force of gravity
parallel to the center of mass
An elevator with a mass of 2,220 kg is supported by a steel cable. What is the tension in the cable when the elevator is accelerated downward at a rate of 3.60 m/s2? (g = 9.80 m/s2)
13,800 N
29,800 N
14,700 N
21,800 N
At a wedding reception, you notice a small boy who appears to have a mass of about 29 kg running partway across the dance floor, then sliding on his knees until he stops. If the coefficient of kinetic friction between the boy’s pants and the floor is 0.25, what is the frictional force acting on him as he slides?
116 N
71 N
280 N
64 N
It requires 840 N of force to slide a couch across a floor at constant velocity. If the couch has a mass of 220 kg, what is the coefficient of kinetic friction between the couch and the floor?
3.82
0.26
0.39
0.84
The diagram represents an object held at rest on a frictionless incline. The net force is equal to
zero
normal force
weight
friction
A block is pulled up a ramp at a constant velocity with a force parallel to the ramp, making an angle θ with the horizontal. As θ is increased,
The block's mass will decrease.
The block's mass will increase.
The block's component of weight parallel to the ramp will increase.
The block's component of weight parallel to the ramp will decrease.
A block is pulled up a ramp at a constant velocity with a force parallel to the ramp, which makes an angle θ with the horizontal. As θ is increased,
the block's mass will decrease
the block's mass will increase
the friction force on the block will increase
the friction force on the block will decrease
A cart rolls down an inclined plane with constant speed, as shown in the diagram below. Which arrow represents the direction of the frictional force?
A
B
C
D
A cart is pulled up an inclined plane at a constant speed, as shown in the diagram below. Which arrow represents the direction of the frictional force?
A
B
C
D
