Long Test

Name: (RAPIZ, Jeth Martin B.)

Before I begin this test, I solemnly pledge that: I will answer each question with honesty and integrity. I will not cheat, copy, or seek unfair help in any way. I will take this test seriously, giving my best effort as a true student of science. I understand that my actions reflect my character, and that God is watching me even when no one else is. I choose to do what is right, to honor my teachers, my school, and my faith. So help me, God.

• Yes, I promise to answer honestly and without cheating.
• No, I do not agree to the pledge

A rescue worker pulls a 100-kg victim horizontally on a sled. The rope tension is 250 N and the sled accelerates at 1.5 m/s². What is the frictional force?

• 100 N
• 150 N
• 250 N
• 400 N
• 85 N

A 10-kg box remains at rest although a student pushes it with 20 N. What force keeps it from moving?

• Kinetic friction
• Normal force
• Static friction
• Air resistance
• Weight

A 1,500-kg car moving at constant speed on level road has 900 N friction opposing motion. The net force is?

• 900 N forward
• 900 N backward
• zero
• 1,800 N forward
• depends on weight

A tablecloth is quickly pulled from under dishes without moving them. Which law explains this?

• Second
• Third
• Universal gravitation
• First
• Law of momentum

A skydiver falls and eventually moves at constant velocity because?

• Air resistance becomes zero
• Gravity stops acting
• Air resistance equals weight
• Weight increases with time
• Air drag exceeds gravity

A 5-kg object experiences two forces: 20 N east and 15 N north. What is the magnitude of the net force?

• 5 N
• 10 N
• 25 N
• 35 N
• none of these

A student believes that invisible forces can still cause motion, just as gravity acts invisibly. Which statement best connects physics to this idea?

• Only visible forces cause motion
• Invisible forces have no effect
• Forces can act even without contact
• Only friction can act at a distance
• Net force is always zero

Which quantity changes when a constant net force acts on an object?

• Mass
• Weight
• Acceleration
• Inertia
• Time