If a person weighs 900 N on Earth, then that same person is recorded to weigh 2125 N on Planet X, what is the acceleration due to gravity of Planet X? (1 point)
40.98 m/s^2
5.78 m/s^2
23.16 m/s^2
33.09 m/s^2
Define Newton's Second Law (1 point)
When an object puts a force on another object, the second object puts a force back on the first, equal in magnitude but opposite in direction
The total energy through any process is conserved
Objects tend to keep their motion unless acted upon by an unbalanced outside force
Fnet = ma
A soccer ball is kicked with a force of 13.5 N to the right. The ball accelerates to the right at a rate of 6.5 m/s^2. What is the mass of the ball? (1 point)
1.58 kg
2.08 kg
6.01 kg
3.31 kg
Define the concept of inertia (1 point)
The property of an object to change its energy
The property of an object to keep moving at its current speed and in its current direction
The property of an object to have its motion changed by an outside force
The property of an object to experience the same force it applies to another object
A block slides on a frictionless surface. The block is given a 25 N force to the right and it accelerates at a rate of 3.5 m/s^2 to the right. This block is then placed on a frictionless surface on Jupiter and given a force of 15 N. What is the acceleration on the block? (1 point)
1.7 m/s^2
8.9 m/s^2
4.3 m/s^2
2.1 m/s^2
A strong gust of wind blows an apple off a tree. The apple has a mass of 0.25 kg. The gust of wind pushes the apple with a force of 1.05 N to the right. What is the net force on the apple? (1 point)
5.5 N
- 2.2 N
1.78 N
2.66 N
A basketball with a mass of 1.5 kg is thrown with a force of 21 N at an angle of 60 degrees above the horizontal. What is the vertical acceleration caused by this force? (1 point)
10.56 m/s^2 upwards
12.12 m/s^2 upwards
12.2 m/s^2 downwards
9.91 m/s^2 downward
An elevator accelerates upwards at an acceleration of 2 m/s. The mass of the elevator is 3500 kg. What is the tension in the elevator cable? (1 point)
3500 N
41,335 N
16,823 N
10,091 N
Use Newton's Third Law to explain how you can walk forward (1 point)
When you walk, you use your legs to apply a force, you accelerate forward
When you walk, you push yourself with a force, changing your velocity
When you walk, you overcome your inertia, allowing you to accelerate
When you walk, you push the Earth back. The Earth in turn, pushes you forward
A boat has a mass of 31,999 kg and a plane has a mass of 110,000 kg. What is the ratio of weight of the plane to the boat? (1 point)
3.44 :1
2.14:1
9.96:1
20.12:1
A briefcase sits stationary in an elevator. The mass of the briefcase if 4.5 kg. The elevator then begins accelerating upwards at 1.10 m/s^2. What is the normal force on this briefcase during this acceleration? (1 point)
44.155 N
38.971 N
51.141 N
48.985 N
A boy is pulling a wagon with a force of 70.0 N directed at an angle of 30 degrees above the horizontal. What are the x and y components of this force? (1 point)
X component - 60.60 N, Y component - 35 N
X component - 45 N, Y component - 10 N
X component - 22.65 N, Y component - 28.9 N
X component - 89 N, Y component - 15.70 N
What amount of force is needed to propel and object of 27 kg to an acceleration of 11,550 m/s^2? (1 point)
311,850 N
257,100 N
119,054 N
398,677 N
A 75,000 N weight truck hits the rear bumper of the 15,000 N weight car at a stop light. What is the ratio of the collision force the truck puts on the car compared to the force the car puts on the truck? (1 point)
5:1
2:1
3:1
1:1
What is the difference between a contact force and a field force? (1 point)
A contact force requires two objects to be touching, a field force works at a distance
A contact force requires two objects to be touching, a field force requires a magnetic field to work
A contact force works at a distance, a field force requires objects to be close to each other
There is no difference between contact and field force
im stuck on all of them but i really need help or guidance or tips! please!
did you ever get the answers? im stuck on the test too and need help.
1.
9.81 * (2125/900) = 23.1625 m/s^2
Now you try some.