Force
Question: What is a force?
Answer: A push or a pull.
Question: What is friction?
Answer: A force that opposes motion between two surfaces.
Question: Every action force has an equal and opposite _____.
Answer: Reaction force.
Question: What is the symbol for Newton?
Answer: N.
Question: Which law states that objects stay at rest or move at constant speed unless acted on by a force?
Answer: Newton's First Law.
Question: What is the SI unit of force?
Answer: Newton (N).
Question: Does friction make objects speed up or slow down?
Answer: Slow down.
Question: Which law explains force pairs?
Answer: Newton's Third Law.
Question: Is force measured in kilograms or Newtons?
Answer: Newtons.
Question: Which law is represented by the equation F = ma?
Answer: Newton's Second Law.
Question: A force changes an object's speed, direction, or shape. True or False?
Answer: True.
Question: Which surface creates more friction: ice or sandpaper?
Answer: Sandpaper.
Question: When you push a wall, what does the wall do?
Answer: It pushes back with an equal force.
Question: Mass is measured in what unit?
Answer: Kilograms (kg).
Question: A heavier object requires more force to accelerate. Which law explains this?
Answer: Newton's Second Law.
Question: Name two effects a force can have on an object.
Answer: Start motion, stop motion, change speed, change direction, or change shape.
Question: Why do football players wear cleats?
Answer: To increase friction and prevent slipping.
Question: Identify the force pair when a swimmer pushes water backward.
Answer: Water pushes the swimmer forward.
Question: Weight is measured in what unit?
Answer: Newtons (N).
Question: A passenger moves forward when a car suddenly stops. Which law explains this?
Answer: Newton's First Law.
Question: A box is pushed with 30 N to the right and 10 N to the left. What is the net force?
Answer: 20 N to the right.
Question: Give one advantage and one disadvantage of friction.
Answer: Advantage: Helps us walk.
Disadvantage: Causes wear and heat.
Question: A rocket moves upward. What force pair causes this motion?
Answer: Rocket pushes gases downward; gases push rocket upward.
Question: A force meter measures force. What is another name for this instrument?
Answer: Spring balance/Newton meter.
Question: A 5 kg object accelerates at 2 m/s². Calculate the force.
Answer: 10 N.