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Which free body diagram best represents the forces on the mower?

Mary pulls on a lawnmower parallel to the ground. The mower moves at a constant speed up the hill. 2. y. x. y. x. y. x. y. x. Which free body diagram best represents the forces on the mower?. 1. 3. 4. 40 0. y. 40 0. x. y. y. 40 0. x. x. y. 40 0. x.

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Which free body diagram best represents the forces on the mower?

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  1. Mary pulls on a lawnmower parallel to the ground. The mower moves at a constant speed up the hill. 2 y x y x y x y x Which free body diagram best represents the forces on the mower? 1 3 4

  2. 400 y 400 x y y 400 x x y 400 x Stacey pulls a mower at 40-degrees relative to the ground. Which free body diagram best represents the forces on the mower? 1 2 4 3

  3. Marsha pulls a sled on ice (no friction). The rope exerts a 150-N force at an angle of 200 above horizontal. The mass of the sled and her brother is 45 kg. g = 10 m/s2. Stacey represented this situation pictorially and mathematically. x x: (150 N) = (45 kg) ax y: N – (45 kg)(10 m/s2) = (45 kg) 0 Did the student mislabel or forget to include anything? 4 Both (1) and (3) need corrections. 5 Both (2) and (3) need corrections. 1 (150 N) should be (150 N) sin 20o. 2 (150 N) should be (150 N) cos 20o. 3 Include a +(150 N) sin 20o term in the y equation.

  4. Steve pulls a sled on ice (no friction) with a 150-N force at an angle of 200. The mass of the sled and her brother is 45 kg. g = 10 m/s2. Stacey represented this pictorially and mathematically. o x x: (150 N) cos 20o = (45 kg) ax y: __ N __ (45 kg)(10 m/s2) __ (150 N) sin 20o = 0 What are the missing signs? 1 + – + 2 + + – 3 – – + 4 – – – 5 + + +

  5. The motion of a car is represented with the motion diagram below. x y 1 y y 2 3 x x x y 5 x o Which diagram best represents the forces exerted on the car by the Earth and the Earth’s surface? y 4 x

  6. x: 0 – (0.80 N) = (1000 kg)ax y: N – (1000 kg)(10 m/s2) = (1000 kg) 0 0 – 16 m/s = ax t Which word description below best matches the above mathematical description? • The 0.80 N force of the Earth on the object causes its speed in the x direction to increase from 0 to 16 m/s. • The object slows down due to a 0.80 N frictional force. • The object has a 10 m/s2 acceleration in the y direction. • The net force causing the object to slow down is exerted in the same direction as the initial velocity. • 5 The object’s velocity increases from 0 to 16 m/s.

  7. y 1 y 3 x x y 4 x Which FBD best represents the above motion diagram for a car? y 2 x

  8. Which motion diagram best represents the situation shown in the free-body diagram? 2 1 4 3 5 Either 2 or 4 are possible

  9. Which FBD below best represents the forces exerted on the ball as it moves UP (ignore air resistance)? 2 1 3 4

  10. Which FBD below best represents the forces exerted on the ball as it moves DOWN (ignore air resistance)? 2 1 3 4

  11. Which FBD below best represents the forces exerted on the ball at the TOP of its path? 2 1 4 3 5 No forces are exerted on the ball

  12. y x Which motion diagram best represents the situation as shown by the free-body diagram? 2 1 4 3 5 No diagram -- the stroller must be accelerating to the right because the net force is to the right.

  13. y x Which speed versus time chart best represents this situation? 1 2 3 v v v t t t

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