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 5000 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