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WorksheetsAS - Dynamics
Total questions: 29
Worksheet time: 58mins
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.
When a falling object stops accelerating and falls at a constant speed, it is
fluency
constant velocity
acceleration
terminal velocity
Air resistance pushes against falling
objects and __________________.
Speeds them up
Keeps them afloat
Slows them down
Spins them
Which two of these forces act on parachutes?
Air Resistance
Gravity
Thrust
Kinetic Energy
When the air resistance or drag is equal and opposite to the weight of the object you would call this
terminal velocity
gravitational weight
flux capacitor
rotational inertia
Eventually the air resistance will be big enough to balance the sky diver's weight. At this point, the forces are __________. So his speed becomes constant. This velocity is called _____________
unbalanced, increasing velocity
unbalanced, terminal velocity
balanced, terminal velocity
A = terminal velocity with parachute
A = terminal velocity without parachute
A = parachute opened
A = landing
D = terminal velocity with parachute
D = terminal velocity without parachute
D = parachute opened
D = landing
C = terminal velocity with parachute
C = terminal velocity without parachute
C = parachute opened
C = landing
A mass of 15 kg is acted on by two forces, one of which is 15 N due east while the second one is 10 N due north. The acceleration of the mass is
1.67 m/s2, 56.3o north of east.
1.2 m/s2, 33.7 o north of east.
1.67 m/s2, 56.3o north of east.
1.67 m/s2, 33.7 o north of east.
Three objects can only move along a straight, level path. The graphs below show the position d of each of the objects plotted as a function of time t.The sum of the forces on the object is zero in which of the cases?
II only
III only
I and II only
I and III only
I, II, and III
The cart of mass 10 kg shown above moves without frictional loss on a level table. A 10 N force pulls on the cart horizontally to the right. At the same time, a 30 N force at an angle of 60° above the horizontal pulls on the cart to the left. What is the magnitude of the horizontal acceleration of the cart?
0.5 m/s2
1.6 m/s2
2.0 m/s2
2.5 m/s2
2.6 m/s2
Two blocks are pushed along a horizontal frictionless surface by a force of 20 newtons to the right, as shown above. The force that the 2-kilogram block exerts on the 3-kilogram block is
8 newtons to the left
8 newtons to the right
10 newtons to the left
12 newtons to the right
20 newtons to the left
How do we define impulse?
A force that is applied at random.
A force that is applied only for a short period of time.
Force multiplied by the time of impact
The time interval that a force lasts.
The total momentum of a system is conserved
always
If no external forces act on the system.
If no internal forces act on the system.
Never; it’s just an approximation.
What is the total change in the cart's momentum?
–20 kg m/s
–10 kg m/s
0 kg m/s
10 kg m/s
30 kg m/s
The 1-kg box is sliding along a frictionless surface. It collides with and sticks to the 2-kg box. Afterward, the speed of the two boxes is
0 m/s
1 m/s
2 m/s
3 m/s
There’s not enough information to tell.
A 5-N force is applied to a 3-kg ball to change its velocity from +9 m/s to +3 m/s. The impulse is encountered by the ball for a time of _______ seconds.
1.8
2.5
3.6
10
Based on the numbers shown in the diagram, is momentum conserved in this collision?
Yes
No
Based on the numbers shown in the diagram, is momentum conserved in this collision?
Yes
No
