µ IB | Newton's Laws

10 quick questions

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10 minutes maximum! (can you do it in 5?)

 

 

Mr. Newton

 1. Which of Newton's laws of motion states that "for every action there is an equal and opposite reaction"?

  • A. Newton's First Law
  • B. Newton's Second Law
  • C. Newton's Third Law
  • D. Newton's Fourth Law

 

2. Which of Newton's laws of motion states that "all objects will continue moving in a straight line at constant velocity unless acted on by a net force"?

  • A. Newton's First Law
  • B. Newton's Second Law
  • C. Newton's Third Law
  • D. Newton's Fourth Law


3. When an object is moving in a straight line at constant velocity, with no net forces acting, it is said to be in.....

  • A. balance.
  • B. translational equilibrium.
  • C. stasis.
  • D. vector equality.

4. Which of the following pairs of forces are 'Newton's third law pairs'?

  • A. The force from a gun on a bullet, and the force causing the recoil of the gun.
  • B. The force from a car's engine pushing it down a road, and the air resistance acting against the motion.
  • C. The force from the Sun on the Earth, and the centripetal force pulling round in an orbit.
  • D. The force produced by wind on a boat's sails, and the force of friction of the water on the boat.

5. This diagram shows a block sitting on the Earth's surface. The diagram is not to scale!

 

 

There are 4 forces labelled. Which are Newton's third law pairs here?

First Newton III pair Second Newton III Pair
A
W and Z R and Y
B
Y and Z R and W
C
R and Z W and Y
D
R and W Only one pair exists

 

6&7.One of Newton's Laws of motion refers to the rate of change of momentum, ΔP/Δt .

 

6. What is the rate of change of momentum equal to?

  • A. Velocity
  • B. Mass
  • C. Acceleration
  • D. Force

7. This law simplifies into a well known equation (for objects of constant mass). Which one?

  • A. F = ma
  • B. speed = distance ÷ time
  • C. W = mg
  • D. v = u + at

 

 

8-10. A school coach of mass 5 000 kg accelerates from 2 ms-1 to 17 ms-1 over a 20 second interval.

 

8. What is the acceleration of the coach?

  • A. 0.85 ms-2
  • B. 34 ms-2
  • C. 1.33 ms-2
  • D. 0.75 ms-2
 

9. What is the change in momentum of the coach during this interval?

  • A. 333 kg ms-1
  • B. 85 000 kg ms-1
  • C. 10 000 kg ms-1
  • D. 75 000 kg ms-1

10. Assuming no friction or air resistance, what force was provided by the engine to provide this change in momentum?

  • A. 0.25 kN
  • B. 10.0 kN
  • C. 3.75 kN
  • D. 4.25 kN