We studied Newton's Laws of Motion in this chapter, which explain the relationship between acceleration and force. Newton's Second Law is especially useful in problem solving. You also learned the difference between mass and weight. You studied how to calculate the force of friction from given data.

You can use the formula sheet if you need some help.

Chapter 4 Quiz

1. How big is the net force acting on an object with constant velocity?

N

2. A car is moving at a constant velocity of 20 km/h (5.56 m/s). How much net force is required to raise its velocity to 50 km/h (13.89 m/s) in 30 seconds? Suppose the car has a mass of 150 kg.

N

3. If the net force of 7 N was continuously applied on 400 g object at rest, how long will it take to raise its velocity to 80 m/s?

s

4. You pushed a 1 kg box on floor where= 0.3. If the force you applied was 5 N, will the box move?

(Yes/No)

5. On Planet X, a 70 kg object can be lifted by a force of 400 N.

a. What is the acceleration of gravity on Planet X?

m/s²

b. How much force is required if the same object is lifted on Earth?

N

c. Suppose your car was taken to Planet X. If the car has a mass of 1500 kg, what would its weight be?

N

6. A book has a mass of 400 g. When you slided the book against the floor with 5 N, it accelerated at the rate of -1.5 m/s². What would the coefficient of friction between the book and the floor be?

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