Question 1

A hockey puck slides across frictionless ice at a constant velocity. According to Newton's First Law, what can you conclude about the net force acting on the puck?

Accepted Answer

The net force acting on the puck is zero.

Question 2

A 40 kg box is pulled with a constant horizontal force of 20 N on a frictionless surface. What is the acceleration of the box?

Accepted Answer

$$a = 0.5\ \mathrm{m/s^2$}$$

Question 3

A car is being towed up a ramp at an angle $$\alpha as $$shown. Which force is responsible for pulling the car up the ramp?

Accepted Answer

The tension $$T$$

Question 4

A ketchup bottle of mass $$0.20\ \mathrm{kg} is $$pushed with an initial velocity of $$2.8\ \mathrm{m/s}$$ and comes to rest after sliding $$1.0\ \mathrm{m}$$ due to friction. What is the magnitude of the friction force acting on the bottle?

Accepted Answer

$$f = 0.56\ \mathrm{N}$$

Question 5

If the net force on an object is doubled while its mass remains constant, what happens to its acceleration?

Accepted Answer

The acceleration is doubled.

Question 6

Which of the following statements about free-body diagrams is correct?

Accepted Answer

They include only the forces acting on the object.

Question 7

A block of mass $$m_1$$ experiences an acceleration $$a_1$$ when a force $$\Sigma F is $$applied. If a second block of mass $$m_2 is $$attached and the same force is applied, what is the new acceleration?

Accepted Answer

$$a_2$$ = \frac{\Sigma F}{$$m_1$$ + $$m_2$$}$$

Question 8

A puck is moving with constant velocity. Which of the following must be true?

Accepted Answer

The net force acting on the puck is zero.

Question 9

A worker pulls a box with a force $$T on a $$frictionless surface. If the box does not move vertically, what can you say about the vertical forces?

Accepted Answer

The normal force equals the weight.

Question 10

A net force $$\Sigma F$$ acts on a puck in the direction opposite to its velocity. What happens to the puck?

Accepted Answer

It decelerates (slows down).

Question 11

A block is pulled with a force $$F$$ and experiences an acceleration $$a. If $$the force is halved, what is the new acceleration?

Accepted Answer

$$a_{new} = a/2$$

Question 12

Which of the following best describes Newton's Second Law?

Accepted Answer

$$\Sigma F = m a$$

Question 13

A car of mass $$m is $$being towed up a ramp at constant speed. What is the net force acting on the car?

Accepted Answer

The net force is zero.

Question 14

A $$0.20\ \mathrm{kg}$$ bottle is pushed with an initial velocity of $$2.8\ \mathrm{m/s}$$ and comes to rest after $$1.0\ \mathrm{m}. $$What is the acceleration of the bottle?

Accepted Answer

$$a = -3.92\ \mathrm{m/s^2$}$$

Question 15

Which of the following is NOT a correct step in solving a force and motion problem?

Accepted Answer

Ignore the direction of forces.

Question 16

A block of mass $$m is $$acted on by a net force $$\Sigma F. If $$the mass is doubled and the same force is applied, what happens to the acceleration?

Accepted Answer

The acceleration is halved.

Newton's Laws of Motion: Study Notes and Applications

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