Q: A rock tied at the end of a string and swung in a circle follows a circular path. If the string breaks, the rock will:

$$\text{Follow a straight-line path}$$

Q: When a car suddenly stops and you lurch forward, this is best explained by:

$$\text{Your tendency to keep moving forward}$$

Q: A car travels around a circular track at a constant speed. Its acceleration is:

$$\text{toward the center of the circle}$$

Question 1

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is:

Accepted Answer

$$	ext{zero}$$

Question 2

A rock tied at the end of a string and swung in a circle follows a circular path. If the string breaks, the rock will:

Accepted Answer

$$	ext{Follow a straight-line path}$$

Question 3

When a car suddenly stops and you lurch forward, this is best explained by:

Accepted Answer

$$	ext{Your tendency to keep moving forward}$$

Question 4

A mosquito flying at $$3\ 	ext{m/s}$$ that encounters a breeze blowing at $$3\ 	ext{m/s} in $$the opposite direction has a speed of:

Accepted Answer

$$6\ 	ext{m/s}$$

Question 5

A car increases its velocity from $$20\ 	ext{m/s} to$$ $$60\ 	ext{m/s} in$$ $$10$$ seconds. Its acceleration is:

Accepted Answer

$$4\ 	ext{m/s}^2$$

Question 6

A ball starting from rest at the top of an inclined plane accelerates at $$2\ 	ext{m/s}^2$$ and reaches the bottom of the plane in $$3$$ seconds. What is the length of the plane?

Accepted Answer

$$18\ 	ext{m}$$

Question 7

If a freely falling object were equipped with a speedometer, its speed reading would increase each second by about:

Accepted Answer

$$10\ 	ext{m/s}$$

Question 8

A 10-N falling object encounters 4 N of air resistance. The net force on the object is:

Accepted Answer

$$6\ 	ext{N}$$

Question 9

A 10-kg block slides with an initial velocity of $$10\ 	ext{m/s}$$ and comes to rest after sliding $$10$$ meters across a horizontal surface due to friction. It takes the block $$2$$ seconds to stop. The stopping force acting on the block is about:

Accepted Answer

$$50\ 	ext{N}$$

Question 10

A car traveling at $$22\ 	ext{m/s}$$ comes to an abrupt halt in $$0.1$$ second when it hits a tree. What is the deceleration of the car?

Accepted Answer

$$220\ 	ext{m/s}^2$$

Question 11

If you double the net force on an object, you'll double its:

Accepted Answer

$$	ext{acceleration}$$

Question 12

Compared to the mass of an apple on Earth, the mass of the apple on the Moon is:

Accepted Answer

$$	ext{the same}$$

Question 13

A block is dragged without acceleration in a straight-line path across a level surface by a force of $$6\ 	ext{N}. $$What is the force of friction between the block and the surface?

Accepted Answer

$$6\ 	ext{N}$$

Question 14

A 1-kg mass is accelerated at $$2\ 	ext{m/s}^2. $$The net force on the mass is:

Accepted Answer

$$2\ 	ext{N}$$

Question 15

A car travels around a circular track at a constant speed. Its acceleration is:

Accepted Answer

$$	ext{toward the center of the circle}$$

Question 16

A freely falling bowling ball falls each second by about:

Accepted Answer

$$10\ 	ext{m}$$

Question 17

If the net force on an object is zero, its acceleration:

Accepted Answer

$$	ext{is zero}$$

Question 18

A 10-N falling object encounters 10 N of air resistance. The net force on the object is:

Accepted Answer

$$0\ 	ext{N}$$

Question 19

A car's speed 5 seconds after accelerating from rest at $$2\ 	ext{m/s}^2 is$$:

Accepted Answer

$$10\ 	ext{m/s}$$

Question 20

A block encounters a frictional force of $$10\ 	ext{N}$$ while sliding. The applied force needed to maintain a constant velocity is:

Accepted Answer

$$10\ 	ext{N}$$

Fundamentals of Kinematics and Dynamics: Study Notes and Practice Questions

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