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WorksheetsSemester 1 exam Part 2
Total questions: 20
Worksheet time: 10mins
Two cars of different masses collide head-on and stop at the point of the collision. Before the collision, -
the acceleration of truck 1 equals the acceleration of truck 2.
the mass of truck 1 equals the mass of truck 2.
the momentum of truck 1 is equal but opposite (in direction) to truck 2.
the velocity of truck 1 is equal but opposite to truck 2.
When comparing the momentum of two moving objects, which statement is ALWAYS correct?
The object with greater velocity has less momentum.
The object with smaller mass has greater momentum.
The object with greater mass and smaller velocity has greater momentum.
The object with greater mass and greater velocity has greater momentum.
A moving freight car runs into an identical car at rest on the track. The cars link together. Compared to the velocity of the first car before the collision, the velocity of the combined cars after the collision is -
twice as large
the same
one half as large
zero
In order to have momentum, an object must be –
at rest
moving
None of these
The planet Earth experiences centripetal force as it orbits the Sun. The centripetal force acting on Earth is -
the gravitational force acting on Earth due to the Sun.
pushing Earth away from the Sun.
tangent to the orbital path of Earth.
would still exist if the Sun were not present
In the diagram , the centripetal force acting on the rock is directed toward point _____.
A
B
C
D
If you whirl a can on the end of a string and the string suddenly breaks, the can
will -
fly directly away from you.
fly directly toward you.
fly off tangentially to its previous circular path
spiral in toward your hand.
A large truck has a mass of 4500 kg. The truck driver has a mass of 90 kg. When the driver is 10 meters from the truck the gravitational force between the driver and the truck is about -
2.7 x 10-7 N
0.027 N
2.7 N
2,700 N
The force of gravitational attraction between two objects is 50N. If the mass of each object was doubled and the distance between the objects was doubled, the gravitational force between the objects would be -
5.0 N
25 N
50 N
200 N
When calculating the gravitational force between two extended bodies, you should measure the distance from -
the center of each body.
the center of one body to the closest point on the other.
the most distant points on each body.
the closest points on each body.
A 4-kg ball is thrown at 6 m/s. What is the ball’s momentum?
1.5 Kgm/s
2 Kgm/s
24 Kgm/s
10 Kgm/s
In the diagram that follows, identify the direction of the centripetal force acting on an object traveling on a frictionless surface.
up
Down
left
Right
Which vector represent the weight of the rider?
I
II
III
Iv
Which vector represent the Normal force?
I
II
III
Iv
Which vector represents the Force of Friction experienced by the bicycle tires?
I
II
III
IV
Of the graphs below, the graph which best represents the gravitational force between two masses as the distance between the masses changes is -
A
B
C
D
The force between two objects is F. If the distance between these two objects is doubled, the force of gravity between the objects will be -
F
2F
1/2 F
1/4 F
A student is pushing her car to the nearest gas station applying a force of ‘F’ on the car with a mass of ‘m’, resulting in an acceleration of ‘a.’ A friend stops to help push the car, thus doubling the force applied. Which expression best represents the acceleration of the car after her friend begins to push?
a/2
a
2a
4a
A person on roller skates starts moving forward by pushing off a wall. Which best represents how Newton's third law affects this situation?
The person pushes backwards against the wall, and the wall pushes the person forward.
The weight of the person will determine the person’s acceleration.
The person remains at rest until the unbalanced force acts on them.
The person's acceleration depends on the force of their push and their mass.
A student is standing still in an elevator accelerating upward. Which free body diagram best represents the forces acting on the student?
A
B
C
