Physics Quiz #2: Application of Newton's Laws

A passenger standing in a moving bus, facing forward suddenly falls forward. This can be an indication of which of the following?

• The bus speeds up

• The bus slows down

• The bus doesn’t change its velocity

• The bus turns to the right

• The bus turns to the left

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An elevator of mass M is pulled upwards at constant velocity by a cable. What is the tension in the cable (neglecting the mass of the cable)?

• less than zero

• between zero and Mg

• equal to Mg

• greater than Mg

• zero

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Which force is directly responsible for your ability to walk?

• weight

• Friction

• Normal Force

• Force of Tension

4. A 65 kg woman is inside an elevator. What is her apparent weight (Normal Force) when the elevator moves at a constant speed of 10 m/s downward?

• 0 N

• 650 N

• 6500 N

• 65 N

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4b. The elevator accelerates upward at a constant rate of 2.4 m/s² (2 pts). What is the acceleration rate of the elevator?

• 1.2 m/s²

• 2.4 m/s²

• 3.6 m/s²

• 4.8 m/s²

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4c. If the scale reads 450 N, what is the magnitude and direction of the elevator’s acceleration?

• 0 m/s², the elevator is at rest

• 1.08 m/s² upwards

• 3.08 m/s² downwards

• 2 m/s² downwards

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5. At the local hockey rink, a puck is given an initial speed of 4.4 m/s as it slides down the hockey rink. Which of the following best represents the forces acting on the puck?

• A. Only gravitational force

• B. Gravitational force and normal force

• C. Gravitational force, normal force, and frictional force

• D. Only frictional force

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5(B) If the coefficient of kinetic friction between the ice and the puck is 0.11, what displacement does the puck slide before coming to rest?

• 9 meters

• 20 meters

• 30 meters

• 40 meters

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6. A 550-kg car is held in place by a light cable ramp. The cable makes an angle of 31 degrees above the surface of the ramp, and the ramp itself rises at 25 degrees above the horizontal. [Honors] (A) Find the tension in the cable (3 pts)

• A) 5000 N

• B) 2711 N

• C) 6000 N

• D) 65011 N

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6. A 550-kg car is held in place by a light cable ramp. The cable makes an angle of 31 degrees above the surface of the ramp, and the ramp itself rises at 25 degrees above the horizontal. [Honors] (B) What is the normal force the car experiences? (3 pts)

• A) 5000 N

• B) 5200 N

• C) 3588 N

• D) 5600 N

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