SUMMATIVE I
FORCES
LAWS OF MOTION
40 ITEMS
1. Which of the following describes a force?
A. a pull only
B. a push only
C. a push or pull or both
D. neither a push nor a pull
2. What is the unit of force in the metric
system?
A. Calories
B. Joules
C. Pound
D. Newton
3. Which has more mass, a kilogram of
cotton or a kilogram of iron?
A. Iron
B. Cotton
C. Both have the same mass
D. Cannot be determined
4. Which of these vehicles moving at same
velocity, is difficult to stop?
A. Train
B. Car
C. Bus
D. Truck
5. What force pulls an object back to the
Earth?
A. Applied
B. Gravitational
C. Magnetic
D. Tension
ENUMERATION:
6 - 9. What are the four contact forces?
10-11. Give two non-contact forces?
12-14. The three laws of motion
SOLVE: 5 points
A 1000 kg truck is traveling at an acceleration of
4.5 m/s². Find the net force needed to accelerate
the truck. (Formula: F = ma)
Given:
a = 4.5 m/s²
m = 1000 kg
F=?
1.
2.
3.
4.
5.
C
D
C
A
B
Enumeration
6-9.
• Applied
• Friction
• Normal
• Tension
10-11.
• Gravitational
• Magnetism
12-14.
• Inertia
• Acceleration
• Interaction
KEY ANSWER
Solve:
Formula:
F = ma
= 1000 kg (4.5 m/s²)
= 4500 N
PART II
POTENTIAL & KINETIC
EFFECTS OF TEMPERATURE
21. The following situations demonstrate potential
energy EXCEPT:
A. a bullet fired from a gun
B. a child at the top of a slide
C. a car parked at the top of a hill
D. river water at the top of a waterfall
22. What is the speed of sound in dry air at 0°C?
A. 31 m/s
B. 331 m/s
C. 3100 m/s
D. 30100 m/s
23. Which wave property is observed when a boy
shouts and hears his own voice inside the church?
A. Echolocation
B. Reflection
C. Refraction
D. Reflection and refraction
24. How do you compare the PE of a moving object
at the highest point compared to its KE?
A. PE is greater than KE
B. KE is greater than PE
C. PE is less than KE
D. KE is less than PE
25. Which of the following pair of quantities are the
factors that affect kinetic energy?
A. Force and distance
B. Mass and height
C. Mass and speed
D. Time and height
Identify whether the objects in the given situations possess
Potential Energy or Kinetic Energy.
26. Bird flying
27. Log in a fireplace
28. Watermelon on a desk
29. Car travelling on the highway
30. Car sitting in a driveway
31. Bunch of coconut stick on a table
32. Ball bouncing on the floor
33. Child jumping on his bed
34. Child sleeping on the crib
35. Marble rolling down the ramp
SOLVE: 5 POINTS
How fast does the sound travel in Baguio City at a
temperature of 20°C?
[ Formula: 𝑣 = 331 𝑚/𝑠 + (0.6 𝑚/𝑠 ) ∙ 𝑇 ]
KEY ANSWER
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
A
B
B
A
C
KE
PE
PE
KE
PE
PE
KE
KE
PE
KE
SOLVE:
Given : 20°C
𝑣 = 331 𝑚/𝑠 + (0.6 𝑚/𝑠 ) ∙ 𝑇
= 331 M/S + (O.6 m/s) . 20°C
= 331 m/s + 12 m/s
= 343 m/s