Think you’ve got your head wrapped around Forces and Motion? Put your knowledge to
the test. Good luck — the Stickman is counting on you!
Q. If car A's top acceleration takes it from 0 mph to 60 mph in 10 seconds, and car B's top acceleration takes it from 0 mph to 60 mph in 5 seconds, which car has the more forceful engine?
Car A
Car B
There is not enough information to answer this question.
Both engines have the same power.
The force of gravity would prevent this sort of acceleration.
Q. What can be said about an object in equilibrium?
The object is accelerating.
Friction is zero.
The object is moving.
The object is moving at constant velocity.
All of the above
Q. We’re standing in an elevator. The elevator begins to go up. How does our weight change?
Our weight increases.
Our weight decreases.
Our weight remains constant.
Our weight increases as the elevator goes up, but will decrease when it goes down.
Our weight decreases as the elevator goes up, but will increase when it goes down.
Q. A car that accelerates from 0 to 60 mph in 8 seconds is driving along a highway at a speed of 60 mph when the driver notices a traffic jam ahead. He has only 4 seconds to bring the car to a complete stop or the traffic jam becomes a pile up. How much force do the breaks need to apply to the wheels relative to the amount of force required to get the car moving at 60 mph in the first place?
Half the force
The same force
Twice the force
Four times the force
None of the above.
Q. How is it possible for an object to be in equilibrium with friction acting on it?
It’s not possible.
Friction must be balanced by another force such that the object continues either at rest or at constant velocity.
At its maximum
It will depend on balls’ radii.
Twice the normal force
Q. The Moon orbits the Earth because:
They exert a gravitational force on each other.
The Moon follows a path in spacetime warped by Earth.
The Moon experiences a centripetal force directed towards the Earth.
All of the above
None of the above
Q. Two bodies of mass m1 and m2 orbit a body of mass M at a distance r. Which of the following statements is true?
If m1 > m2, then m1 will have a higher orbital speed.
If m1 < m2, then m1 will have a higher orbital speed.
If m1 < m2, then m1 will have a lower orbital speed.
If m1 > m2, then m1 will have a lower orbital speed.
Both m1 and m2 have the same orbital speed.
Q. If the mass of the Sun suddenly increased, what would happen to the planets in orbit?
The planets’ orbits would increase in size.
The planets’ orbits would decrease in size.
The planets’ masses would automatically increase to counteract the Sun’s stronger gravitational pull.
The planets’ orbits would change from elliptical to circular.
The planets would be expelled from the Solar System.
Q. If the mass of the Sun suddenly decreased, but the planets’ orbits stayed the same, what else would need to change about the current configuration of this new Solar System?
The planets’ orbital speeds would need to decrease.
The planets’ orbital speeds would need to increase.
Nothing could be done. The planets wouldn’t stay in orbit.
Nothing could be done. The planets would come crashing into the Sun.
The current configuration would remain as such regardless.
Q. A roller coaster ride’s physics is best described by:
Placing heavier people in front to ensure the coaster rolls.
Centripetal and gravitational forces and accompanying accelerations.
Using tracks with electricity.
Using g to reach larger heights.
Using kinetic friction along the way to slow down.