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When an object is in free fall,
1. its speed stays the same.
2. it decelerates.
3. it accelerates.
4. none of the above.

This question is a part of a group with common instructions. View group »

$v= (Deltad)/t$ is the equation to calculate
1. acceleration.
2. speed.
3. velocity.
4. slope.
If a net force diagram is drawn, such as shown, wherein the $F_"norm"" at A "=-(F_g)" at C"$, what do you know about the object?
1. The object is accelerating in the direction of the $F_"app"" at B"$ because there is no opposing force to B, and $F_"app"" at "B>0N$.
2. The object is accelerating in the opposite direction of $F_"app"" at B"$ because forces act in equal but opposite pairs.
3. The object is not moving because the $F_"net"=F_"norm"+F_g=0N$.
4. The object is accelerating in the direction of the $F_"app"" at B"$ because the opposing $F_"fric"$ must be negligible, and $F_"app"" at "B>0N$.
Torque is a measure of a force's tendency to produce                  .
1. linear motion
2. freefall motion
3. rotational motion
4. momentum
Two rocks are thrown at the same time with the same speed. One is thrown directly downward while the other is thrown straight up. Which statement correctly compares their speeds when they hit the ground?
1. The rock thrown straight up hits the ground at a faster speed.
2. The rock thrown directly downward hits the ground at a faster speed.
3. Both rocks hit the ground at the same speed.
4. There is not enough information to compare their speeds.
Under what conditions does a pendulum exhibit a simple harmonic motion?
1. Amplitude is small.
2. Friction is negligible.
3. Air drag is negligible.
4. All of the above.
Given a force diagram like the one shown, if the object is not moving, what do you know about the forces at A and B?
1. $F_"norm"$ is less than $F_g$ because the object stays down on the surface.
2. $F_g$ is always greater than $F_"norm"$ when an object is not moving.
3. $F_"norm"=F_g$ when an object is not moving.
4. $F_"norm"=-(F_g)$ making the $F_"net"=0$ when an object is not moving.
What are the units of the force constant k of a spring?
1. $(kg)/s^2$
2. kg/s
3. $N/m^2$
4. Nm
Which of these is true for a body in mechanical equilibrium?
1. The vector sum of all external forces is zero.
2. The sum of the moments of all external forces about any line is zero.
3. Both of the above.
According to Hooke’s Law, the graph of the applied force, F, as a function of the displacement of the spring, $x$, will be
1. a straight line, with slope, $k$, passing through $x = 1/2$.
2. a straight line with slope, $k$, passing through $x = 1$.
4. a straight line with slope, $k$, passing through the origin.