1. A cargo spacecraft that bring supplies to the international space
station (ISS) is launchedusing rocket propulsion. The spacecraft
rockets fire hot gases backwards. Which of the following statements
is true about the situation according to Newtons third law? When
the Rockets fire hot gases backwards this creates huge
forces in the opposite direction,exerted on the spacecraft by
the hot gases.
2. A parachute is deployed to slow down a skydiver as he descends
towards the ground.What happens while he is descending? His
velocity points downward and his acceleration points
upwards. Velocity always points in the direction of
motion and acceleration in the direction of changing
velocity which in this case means upward.
3. As a cargo spacecraft lifts off its booster rockets are employed to
accelerated. Assume that the booster rockets apply constant force on
the spacecraft. The higher the spacecraft ascends the less mass it has,
because some of its fuel is burned. What is happening as a spacecraft
is ascending? Both its speed and acceleration increase. Since
the mass of the aircraft is decreasing the acceleration
provided by its booster rocket is increasing which causes
the speed to increase accordingly.
4. Identify which of the following is not a correct statement about
inertia. And object withless mass has more inertia. Mass is
the measure of inertia; more mass means more inertia.
5. Moving in an orbit around the earth the ISS has forward motion. This
, motion is a long a straight line that would carry it away from Earth if
Earth’s gravitational force didn’t pull on it. This forward motion of
the ISS is caused by its inertia. If the force of Earth's gravitywere
suddenly to disappear, the ISS would continue to move in a straight
line with constant speed. This kind of behavior is best explained by
the fact that the ISS has inertia.
6. The greater the net force acting on an object, the greater the
acceleration of the object.
7. An astronaut on board the ISS gently lift her feet off the floor of the
cabin, so that she isnot touching any object. At this moment, the ISS
rocket starts to re-boost and acceleratethe ISS forward. What will
happen to the astronaut initially? To an observer accelerating
with the ISS, she will appear to be accelerating backwards
because the ISS will be accelerating forward.
8. If two boxes with masses of 5 kg and 20 kg are pushed with the
same force which onewill accelerate more? The 5 kg box.
9. When a rocket is launched, most of the fuel it is curing is used in the
first few minutes ofthe mission to achieve a required acceleration. As
the fuel is burning, the rocket’s total mass is decreasing, and its
acceleration is increasing.
, 10. Which of the following derived units do NOT measure speed?
mm/min^2
11. For which case is the net force acting on the object NOT equal
to zero? A rocketaccelerating upward at a rate of 5
m/s^2
12. Two tugboats attach their lines to a separate barge with the same
masses in a shippingchannel. If one tugboat pulls Barge A towards
the west while the other tugboat pulls Barge B in the same direction
applying twice as much force, which barge will acceleratemore?
Barge B
13. If the net force is zero on a motorcycle traveling at 20 m/s,
which of the following statements is true concerning the motion
of the motorcycle? The motorcycle will continue traveling
at 20 m/s.
14. Which of the following statements is FALSE? A force is
not needed to causeacceleration.
15. A car’s engine provides a force of 200 N forward, while a force of 150
N from air resistance acts to oppose the car’s motion. What is the net
force and its direction on thecar? 50 N, forward.
16. If the net force acting on an object is halved, how will the
acceleration change? Theacceleration will be half as much.
17. Which of the following statements regarding inertia is FALSE?
station (ISS) is launchedusing rocket propulsion. The spacecraft
rockets fire hot gases backwards. Which of the following statements
is true about the situation according to Newtons third law? When
the Rockets fire hot gases backwards this creates huge
forces in the opposite direction,exerted on the spacecraft by
the hot gases.
2. A parachute is deployed to slow down a skydiver as he descends
towards the ground.What happens while he is descending? His
velocity points downward and his acceleration points
upwards. Velocity always points in the direction of
motion and acceleration in the direction of changing
velocity which in this case means upward.
3. As a cargo spacecraft lifts off its booster rockets are employed to
accelerated. Assume that the booster rockets apply constant force on
the spacecraft. The higher the spacecraft ascends the less mass it has,
because some of its fuel is burned. What is happening as a spacecraft
is ascending? Both its speed and acceleration increase. Since
the mass of the aircraft is decreasing the acceleration
provided by its booster rocket is increasing which causes
the speed to increase accordingly.
4. Identify which of the following is not a correct statement about
inertia. And object withless mass has more inertia. Mass is
the measure of inertia; more mass means more inertia.
5. Moving in an orbit around the earth the ISS has forward motion. This
, motion is a long a straight line that would carry it away from Earth if
Earth’s gravitational force didn’t pull on it. This forward motion of
the ISS is caused by its inertia. If the force of Earth's gravitywere
suddenly to disappear, the ISS would continue to move in a straight
line with constant speed. This kind of behavior is best explained by
the fact that the ISS has inertia.
6. The greater the net force acting on an object, the greater the
acceleration of the object.
7. An astronaut on board the ISS gently lift her feet off the floor of the
cabin, so that she isnot touching any object. At this moment, the ISS
rocket starts to re-boost and acceleratethe ISS forward. What will
happen to the astronaut initially? To an observer accelerating
with the ISS, she will appear to be accelerating backwards
because the ISS will be accelerating forward.
8. If two boxes with masses of 5 kg and 20 kg are pushed with the
same force which onewill accelerate more? The 5 kg box.
9. When a rocket is launched, most of the fuel it is curing is used in the
first few minutes ofthe mission to achieve a required acceleration. As
the fuel is burning, the rocket’s total mass is decreasing, and its
acceleration is increasing.
, 10. Which of the following derived units do NOT measure speed?
mm/min^2
11. For which case is the net force acting on the object NOT equal
to zero? A rocketaccelerating upward at a rate of 5
m/s^2
12. Two tugboats attach their lines to a separate barge with the same
masses in a shippingchannel. If one tugboat pulls Barge A towards
the west while the other tugboat pulls Barge B in the same direction
applying twice as much force, which barge will acceleratemore?
Barge B
13. If the net force is zero on a motorcycle traveling at 20 m/s,
which of the following statements is true concerning the motion
of the motorcycle? The motorcycle will continue traveling
at 20 m/s.
14. Which of the following statements is FALSE? A force is
not needed to causeacceleration.
15. A car’s engine provides a force of 200 N forward, while a force of 150
N from air resistance acts to oppose the car’s motion. What is the net
force and its direction on thecar? 50 N, forward.
16. If the net force acting on an object is halved, how will the
acceleration change? Theacceleration will be half as much.
17. Which of the following statements regarding inertia is FALSE?
