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Physics
9th
grade
Laws of Motion - Conceptual Questions and Numerical Problems
25 questions
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- 1. Multiple Choice"For every action, there is an equal and opposite reaction."Newton's 1st LawNewton's 2nd LawNewton's 3rd LawNewton's 4th Law
- 2. Multiple Choice
The link between force, mass and acceleration is defined by
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
Newton's 4th Law
- 3. Multiple Choice"An object in motion (or at rest) will to stay in motion (or at rest) until an outside force acts upon it."Newton's 1st LawNewton's 2nd LawNewton's 3rd LawNewton's 4th Law
- 4. Multiple ChoiceThe tendency of an object to resist changes in its motion is...inertiaforceaccelerationvelocity
- 5. Multiple ChoiceThe force that opposes motion between two surfaces in contact with each other.inertiafrictionmomentumgravity
- 6. Multiple Choice
Inertia depends on __________.
Weight
Velocity
Mass
Acceleration
- 7. Fill in the Blank
The force needed to accelerate 1 kg of an object at an acceleration of 1 m/s2 is
- 8. Multiple Choice
An object with a mass of 100 kg is observed to accelerate at the rate of 5 m/s2. Calculate the force required to produce this acceleration.
20 N
500 m/s
500 kg
500 N
- 9. Multiple Choice
A basketball with a mass of 0.60 kg is accelerated with a force of 10.8 N. If resisting forces are ignored, what is the acceleration of the basketball to the nearest m/s2?
0.06 N
6.48 m/s2
18 N
18 m/s2
- 10. Multiple Choice
A tow truck exerts a force of 3000 N on a car, accelerating it at 3 m/s2. What is the mass of the car?
1000 N
1000 kg
9000 N
9000 kg
10 000 kg
- 11. Multiple ChoiceThe diagram shows a homemade car being pushed with a force of 25 N. The force causes the car to move at a constant speed of 3 m/s. What will happen if the force is changed to 35 N?The car will move at a constant speed of 13 m/s.The speed of the car will not change.The speed of the car will increase.The speed of the car will decrease to 1 m/s.
- 12. Multiple Choice
The diagram below shows two different forces acting on a cyclist riding a bicycle.
The total mass of the cyclist and the bicycle is 100.0 kg. Based on this information, what is the acceleration of the cyclist?
0.66 m/s2 backward, because the force of the air slows the cyclist down
0.66 m/s2 forward, because the applied force is greater than the force of the air
2.3 m/s2 backward, because the forces are opposite and not equal
2.3 m/s2 forward, because the cyclist's inertia is greater than the force of the air
- 13. Multiple Choice
Which diagram represents an object moving to the right at a constant velocity?
a
b
c
d
a or c
- 14. Fill in the Blank
Name the force acting upwards on the book.
- 15. Multiple Choice
Which one of these boxes can be said to be moving at constant velocity?
box 1
box 2
box 3
box 4
none
- 16. Multiple Choice
Forces acting in the horizontal plane on a 5 kg object are shown in the diagram. (seeing from the top, birds-eye view). What is the acceleration of the object?
4 m/s2
3.4 m/s2
7 m/s2
0
- 17. Multiple Choice
Tick all the contact forces in the list below:
friction
normal force
weight
upthrust
air drag
- 18. Multiple Choice
Tick all the field forces in the list below:
weight
normal
electric force
magnetic force
friction
- 19. Multiple Choice
A graph of Frictional Forces (f) versus Applied Force (P) is given. What is the kinetic friction force on this surface?
25 N
50 N
75 N
100 N
- 20. Multiple Choice
According to the friction force (f) versus applied force (P) graph given, what is the state of motion of the object when 25 N of force is applied?
it accelerates
it stays at rest
it moves at constant speed
there is not enough information
it decelerates
- 21. Multiple Choice
A graph of Frictional Forces (f) versus Applied Force (P) on an object on a horizontal surface is given in the diagram. The object has a mass of 3 kg. What is the acceleration of the object when 125 N of force is applied?
0
25 m/s2
41.7 m/s2
50 m/s2
- 22. Multiple Choice
The diagram below shows a box held stationary on a ramp by a string connected to a wall.
Which of the following relationship is true?
A
B
C
D
- 23. Multiple Choice
Which of the following is the best expression for the Normal Force?
FN = mg cos(ϴ)
FN = mg sin(ϴ)
FN = mg sin(180-ϴ)
FN = mg cos(90-ϴ)
- 24. Fill in the Blank
What is the tension in the string? Calculate using g=10 N/kg. State your answer only with three significant number together with its unit. (There is no friction anywhere in the system)
- 25. Multiple Choice
Two masses are connected by a string over a frictionless pulley. Applying the laws of motion, which equation is correct to find the acceleration of the system?
- Answer choicesTagsAnswer choicesTags