Newton’s Laws
Newton’s first law is also called the Law of
(Inertia)
The formula for speed is
(speed = distance ÷ time)
What force pulls objects toward the center of the Earth?
(Gravity)
A ramp is an example of what type of simple machine?
(Inclined plane)
When you jump in the air, what force brings you back down?
(Gravity)
Newton’s second law states that force
(mass × acceleration)
How does velocity differ from speed?
(Velocity includes direction, speed does not.)
Name one way to reduce friction.
(Use lubrication, smooth the surface, reduce contact area, etc.)
A seesaw is an example of what simple machine?
(Lever)
What happens to an object’s motion when unbalanced forces act on it?
(It accelerates.)
Newton’s third law states that for every action, there is an
equal and opposite reaction)
A car is moving 30 m in 5 seconds.
What is its speed? (30 ÷ 5 = 6 m/s)
What force resists motion between two surfaces in contact?
(Friction)
What type of simple machine is used in bicycles to help change direction?
(Pulley)
A soccer ball keeps rolling until friction or another force stops it. Which of Newton’s laws explains this?
(First Law – Inertia)
Give a real-world example of Newton’s first law.
e.g., a passenger jerking forward when a car stops suddenly)
A roller coaster going down a hill is an example of which type of acceleration?
(Negative acceleration or deceleration)
Which force allows airplanes to lift off the ground?
(Lift)
A wheelbarrow is an example of what type of lever?
(Second-class lever)
Why do astronauts feel weightless in space?
(They are in free fall.)
(F = ma → 5 × 2 = 10N)
If a cyclist increases speed from 10 m/s to 20 m/s in 5 seconds, what is the acceleration?
(a = (vf - vi) ÷ t → (20 - 10) ÷ 5 = 2 m/s²)
If an object is moving at a constant velocity, what can you say about the forces acting on it?
(They are balanced.)
How do simple machines make work easier?
(By reducing the force needed or changing the direction of the force.)
If two cars are moving at the same speed, but one has more mass, which has greater momentum?
(The car with more mass.)