1. The speed in the second trial is twice the speed in the first trial.
2. static friction
3. 0.02 m/s^2
4. 200 N
5. You would fall through the chair.
6. A hockey puck is gliding along ice (a frictionless surface) at a constant speed.
7. 5 N to the right
8. Friction opposes the motion of two surfaces that are in contact.
9. This question seems to be missing the given mass and velocity needed to calculate momentum.
10. This question seems to be missing the momenta of objects A and B.
11. 10.2 kg
12. FN
13. The object is at rest.
14. 15.3 m/s^2
15. Newton
16. 10 N to the right
17. multiplying mass by acceleration due to gravity
18. 10 m/s^2
19. This question seems to be missing the total momentum after the collision.
20. west
Motion and Forces Post-Test
You must answer ALL QUESTIONS, 1 - 20.
1.
Students conducted an investigation by dropping a ball from two different heights. In the first trial, the ball was dropped from a height of 10 meters and the speed was measured after 2 seconds. In the second trial, the ball was dropped from a height of 20 meters and the speed was measured after 2 seconds. Which of these describes the relationship between the measured speeds in the two trials?
The speed in the second trial is twice the speed in the first trial.
The speed in the first trial will be the same as the speed in the second trial.
The speed in the second trial will be 10 m/sec faster than the speed in the first trial.
The speed in the first trial will be 10 m/sec faster than the speed in the second trial.
2.
Which type of friction has the strongest force?
fluid friction
static friction
sliding friction
rolling friction
3.
Find the acceleration of an object when the force is 5.2 N and the mass is 2.6 x 102 kg.
2.0 m/s2
0.02 m/s2
50 m/s2
1.4 x 103 m/s2
4.
Your dog Rosie suddenly exerts a force of 200 N on her leash. What equilibrant force must you exert to stop her?
0 N
500 N
200 N
201 N
5.
Suppose you sat on a chair, and your force of gravity was greater than the normal force. What would you expect to happen?
You would sit comfortably on the chair.
You would slide off of the chair.
You would fall through the chair.
You would bounce off of the chair.
6.
Which scenario below exemplifies Newton's first law of motion?
A hockey puck is gliding along ice (a frictionless surface) at a constant speed.
The weight of an object on the moon will be less than the weight of the same object on the earth.
It takes less force to move a chair than to move a piano.
When you push a heavy box, the box also pushes you.
7.
George and Frank are moving their piano for the big concert. George is pushing the piano with 25 N of force. Frank is pulling the piano with 20 N of force. What is the combined force on the piano?
Image of some movers pushing a piano.
5 N to the right
45 N to the left
5 N to the left
45 N to the right
8.
Which statement best describes friction?
Friction acts in the same direction of motion.
Friction opposes the motion of two surfaces that are in contact.
Friction is dependent on contact area.
Friction acts perpendicular to the surfaces that are in contact.
9.
Calculate the momentum of a truck having a mass of
kg that is traveling at
m/s west.
west
kg
west
10.
Two objects collide. Object A has a momentum of
, and Object B has a momentum of
before the collision. What is the total momentum after the collision?
11.
A force of 162 N is applied to an object causing it to accelerate at a rate of
. What is its mass?
0.2 kg
43 kg
616 kg
102 kg
12.
What force is greater than the applied force?
Ff
FN
FT
Fg
13.
Under what circumstances would an object's momentum be zero?
The object is very small or is moving very slow.
The object is moving backward.
The object is not accelerating.
The object is at rest.
14.
You are pushing a cart of groceries with a force of 368 N. The mass of the cart is 24 kg. What is the cart’s acceleration?
8.9 x 103 m/s2
0.7 m/s2
0 m/s2
15.3 m/s2
15.
A newton is equal to which of the following?
16.
Finn and Micah are arguing over who is responsible for throwing away this box. Finn is pushing the box with a force of 25 N to the right. Micah is pushing the box with a force of 15 N to the left. What is the combined force on the box?
Image of two hands pushing on a box in opposite directions to show "Newton
10 N to the right
40 N to the right
35 N to the left
The box is not moving.
17.
Weight is calculated by _____.
multiplying mass by the deceleration due to gravity
multiplying mass by acceleration due to gravity
dividing acceleration by mass
dividing mass by acceleration
18.
Find the acceleration of an object when the force is 850 N and the mass is 85 kg.
7.3 x 104 m/s2
0 m/s2
10 m/s2
0.1 m/s2
19.
Two cars are involved in a crash (no one was hurt in the accident). If the total momentum is
after the collision, what is the total momentum before the collision?
20.
Two buses have equal masses (
kg). Bus A is moving at a velocity of
m/s west. Bus B is at rest. When they collide, Bus B bounces off of Bus A. After they collide, Bus A has zero momentum. What is the final momentum of Bus B?
west
west
west
west
1 answer