Mastery Quiz 5. NEWTON’S 1st LAW OF MOTION
DO NOT WRITE ON THIS PAPER
Section 1. VSC 5.8.A.2. Concept Questions
1. A toy car rolls at a constant speed down a straight inclined track. When the car reaches the flat surface
at the base of the inclined track, the speed of the car decreases. Which statement best explains why the
speed of the car decreases when it reaches the flat surface?
A The force of gravity acting on the car increases.
B The force of gravity acting on the car decreases.
C The forces influencing the car are not balanced.
D The forces influencing the car are balanced.
2. A student pushed a large rubber ball on a flat, frictionless surface. The ball rolled at a speed of 1 meter
per second. Which statement best describes the motion of the ball when the student stopped pushing
the ball?
A The ball accelerated.
B
C
D
The ball did not move.
The ball changed direction.
The ball continued to move in the same direction at 1 meter per second.
3. Use the information and the picture below to answer the following.
An apple was placed on the back seat of the car. The car was then accelerated toward the barrier at 60
kilometers per hour (kph). Which statement best describes the motion of the apple immediately after
the car hit the barrier?
A The apple moved forward at 30 kph.
B The apple moved forward at 60 kph.
C The apple moved backward at 30 kph.
D The apple moved backward at 60 kph.
4. What type of force causes an ice skater to begin to move?
A Balanced
B Gravitational
C Magnetic
D Unbalanced
5. Pedaling a bicycle applies a forward force. Which sentence describes the forces acting on a bicycle
moving at constant speed on a straight, level road?
A Friction and air resistance are both zero.
B Friction, air resistance, and forward force are all equal.
C
D
Forward force equals friction and air resistance combined.
Friction and air resistance combined are less than the forward force.
Section 2. Drawing and Reading Force Diagrams
Directions: The figure represents a car driving down the road. Use the figure to answer question 6
below.
6. Which of the following is true?
A
The forces acting on the car are balanced.
B
The car is accelerating.
C
The force of gravity is not acting on the car.
D
The force of friction and the air resistance force is greater than the applied force.
Directions: For questions 7 and 8, draw force diagrams that include all real-world forces acting on
the object and show the appropriate state of motion.
7. A person throwing a baseball (draw the ball, not the person).
8. A car moving at a constant speed on the road.
Section 3. This Week’s Vocabulary
Word Bank:
Acceleration
Balanced force
Gravity
Support force
Inertia
Unbalanced force
Friction
Applied force
Mass
Force
Air resistance
Newton’s 1st Law of motion
Directions: Fill in the blank using the words from the word blank above. Not all words in the word
bank will be used. Select the correct terms that fit the sentences below.
9. The force that one solid surface opposes on another when they move against each other is called
___________________.
10. A person in a head-on car collision who is not wearing a seatbelt continues to move forward at the
original speed of the car because of ________________.
11. If an object starts to accelerate, this must mean that an ____________________ is acting on it.
12. __________________ is the force of friction from the air that acts opposite to the motion of the
moving object.
13. A _____________ is a push or pull in a given direction
14. The force that pulls all objects with mass together is called ________________.