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1
You pull a sled with constant force, but it speeds up. Why?
No friction
Mass is zero
Constant speed
Force > friction
2
We are not normally aware of the gravitational or electric force between two ordinary objects. Why is this? (from ps 15)
because we only notice when its with two very big objects
because it doesn't exist
because it doesn't happen to everyday objects
3
Which of the following statements are correct? (Select all that apply.) (From Webassign 4)
None of these answers are correct.
It is possible for an object to move if no forces on the object.
It is possible to have forces on an object if the object isn't moving.
4
For how long must a net force of 22 N be exerted on a 3 kg bag of rice to increase its speed by 10 m/s?
1.37
4.26
2.49
3.33
5
The force of gravity on a 2 kg rock is twice than on a 1 kg rock. Why doesn’t the heavier rock fall faster? (from ps 11)
just because idk
Because its mass makes it fall slower
this isnt true
The accelerations are the same even though the forces are different.
6
A heavy and a light object fall in a vacuum. What’s true?
Light one hits first
No gravity in vacuum
Heavy one hits first
Both hit the ground together
7
A block slides down a frictionless incline. Its acceleration depends on:
Both mass and angle
Neither
Mass only
Angle only
8
Why can field lines never cross? (from ps 16)
because of newtons laws
because they are too strong
because of physics
because a charge would feel the force from two directions at once
9
A force of 15N has been exerted onto a 6kg microwave for 4s. How much does its speed increase by?
10
32
20
65
10
A force of 20N is exerted onto a 4kg medium sized watermelon. What is its acceleration?
7m/s2
2m/s2
4m/s2
5 m/s2
11
A box slides
down
a frictionless ramp. Another goes
up
a rough ramp (same angle) at constant speed.
Same normal force
Friction is greater going up
Down box speeds up
Net force = 0 for both
12
An object experiences no acceleration. Which of the following cannot be true for the object?
No forces act on the object.
Forces act on the object, but the forces cancel.
A single force acts on the object.
13
When determining an electric field, must we use a positive test charge, or would a negative one do as well? (from ps 16)
a negative charge would work as well
only a negative test charge works
neither work
only a positive charge works
14
Two forces act on an object in opposite directions. If the object moves with constant velocity, the forces are:
Increasing
Equal
Unequal
Zero
15
An object experiences a net force and has an acceleration in response. Which of the following statements is always true?
The object moves in the direction of the force.
The acceleration is in the same direction as the velocity.
The acceleration is in the same direction as the force.
The velocity of the object increases.
