Newton's Laws of Motion Flashcards
7 cards from real BMST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Newton's Laws of Motion flashcards as text
A 5 kg object accelerates at 4 m/s². What net force is acting on it?
Answer: 20 N
F = ma = 5 kg × 4 m/s² = 20 N.
Friction is a force that opposes motion. In terms of Newton's laws, friction affects an object by:
Answer: Reducing the net force and thus acceleration
Friction acts opposite to motion, reducing net force, which by F = ma reduces acceleration.
A ball rolling on a frictionless surface will:
Answer: Continue rolling at constant speed indefinitely
With no friction (no net force), Newton's First Law says the ball maintains constant velocity.
When you press your hand against a wall, the wall presses back on your hand. This is an example of:
Answer: Newton's Third Law
Newton's Third Law: every action force has an equal and opposite reaction force.
Which scenario best demonstrates Newton's Second Law?
Answer: A heavier cart accelerates less than a lighter one under the same force
F = ma shows that with equal force, greater mass produces less acceleration.
A net force of 0 N acts on a moving object. The object will:
Answer: Continue at constant velocity
Zero net force means zero acceleration; the object maintains its current velocity (Newton's First Law).
A horse pulls a cart forward. The cart pulls the horse backward with equal force. Why does the system move forward?
Answer: The action-reaction forces act on different objects, so net forces on each object differ
Action-reaction forces act on different objects; the horse moves forward because the ground's friction on its hooves exceeds the cart's pull.