Caught Red-Handed
A soccer ball sits still on the field until a player kicks it.
What is Newton's First Law of Motion?
Newton's First Law states that an object at rest stays at rest unless acted upon by a(n)________________ force.
What is "unbalanced"?
A 10kg box is pushed with a net force of 20 N. What is the acceleration?
2 m/s2
True or False: A book sitting on a table has no forces acting on it. (If false identify one force acting on it)
False (gravity pulling down/table pressing up)
A book sits on a desk. Gravity pulls it down with 20 N and the desk pushes up with 20 N. Are the forces balanced or unbalanced? If unbalanced what is the unbalanced force?
Balanced
Which law is summarized by the equation F=ma?
What is Newton's Second Law?
A rocket blasts hot gas downward and the rocket shoots upward.
What is Newton's Third Law of Motion?
Newton's Second Law: Force equals mass times ___________.
A 5 kg object accelerates at 41 m/s2. What is the force acting on it?
20 N
True
A soccer ball is kicked and rolls across the grass, slowly coming to a stop. Are the forces balanced or unbalanced? If unbalanced, what is the unbalanced force?
Unbalanced- friction from grass
Which law is also known as the "Law of Inertia"?
What is Newton's First Law?
A heavy truck and a small car both brake hard. The truck takes much longer to stop.
What is Newton's Second Law of Motion?
Newton's Third Law: For every action there is an equal and __________ reaction.
What is "opposite"?
A force of 30N causes an object to accelerate at 6m/s2. What is the mass of the object?
5kg
True or False: A more massive object always accelerates faster than a lighter one when the same force is applied.
False- Greater mass means LESS acceleration when the same force is applied.
A tug of war team on the left pulls with 300 N and the team on the right pulls with 450 N. Will the rope move? if yes in which direction?
Yes- to the right
Force is measured with this unit.
What are Newtons (N)
While swimming, Maya pushes the pool wall backward with her feet. She moves forward.
What is Newton's Third Law of Motion?
The property of matter that resists changes in motion is called __________.
What is "inertia"?
A 15 kg sled is pushed with 45 N and experiences 15 N of friction. What is the acceleration? (hint: forces are being applied to the same object in opposite directions)
30 N
True or False: Newton's 3rd Law forces always act on the SAME object.
False- Action/reaction pairs act on different objects
If an object is moving at a constant speed (not accelerating), are the forces balanced or unbalanced?
Balanced- no acceleration= balanced forces so even though it is moving the forces are still balanced
Acceleration is always measured in this unit:
What is m/s2?
A puck slides across a frictionless surface of ice and keeps going at the same speed forever (theoretically).
What is Newton's First Law of Motion?
When you double the net force on an object while keeping the mass the same, the acceleration will __________.
What is "double"?
A 1200 kg car brakes with 6000N of force. What is the deceleration?
5 m/s2
True or False: According to the 3rd Law when a horse pulls a cart forward, the cart pulls back on the horse with the same force, so the forces cancel out and nothing should move.
False- because the forces act on different objects, they do not cancel each other out.
Draw a diagram showing the forces being applied in the scenario and show direction of movement and with how much force. A swimmer pushes off the pool wall and glides through the water. The push from the wall sends her forward with 200 N, but water resistance pushes back with only 80 N.
forward 120N
The law of action/reaction