Question 1

A block of ice rests on a ramp. As the ramp is gradually raised, which force acting on the block remains constant?

Accepted Answer

The gravitational force $$mg$$

Question 2

According to Newton's first law of motion, what will happen to an object in motion if no net force acts upon it?

Accepted Answer

It will continue moving at constant speed in a straight line

Question 3

A 10 kg box is pushed with a net force of $$50\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

$$5\ \mathrm{m/s^2$}$$

Question 4

When a ramp is raised to $$90^\circ ($$vertical), what is the net force acting on a block of mass $$m$$?

Accepted Answer

$$mg$$, acting downward

Question 5

Which of the following best describes Newton's third law of motion?

Accepted Answer

For every action, there is an equal and opposite reaction

Question 6

A hockey puck slides on frictionless ice. If no forces act on it, what will happen to its velocity?

Accepted Answer

It will remain constant

Question 7

A 5 kg object is acted upon by two forces: $$F_1 = 10$$\ \mathrm{N}$$ to the right and F_2$ = 4\ \mathrm{N} to $$the left. What is the acceleration of the object?

Accepted Answer

$$2\ \mathrm{m/s^2$} to $$the right

Question 8

A person pushes against a wall with a force of $$100\ \mathrm{N}. $$According to Newton's third law, what force does the wall exert?

Accepted Answer

A force of $$100\ \mathrm{N} in $$the opposite direction

Question 9

On an inclined plane, which component of the gravitational force is equal and opposite to the normal force $$N$$?

Accepted Answer

$$mg \cos 	heta$$

Question 10

A 2 kg block is at rest on a frictionless horizontal surface. If a constant force of $$6\ \mathrm{N} is $$applied for $$3\ \mathrm{s}$$, what is the final velocity of the block?

Accepted Answer

$$9\ \mathrm{m/s}$$

Question 11

A car of mass $$1000\ \mathrm{kg}$$ accelerates from rest to $$20\ \mathrm{m/s} in$$ $$10\ \mathrm{s}. $$What is the average net force applied to the car?

Accepted Answer

$$2000\ \mathrm{N}$$

Question 12

If a block is sliding down a ramp and the ramp angle is increased, what happens to the normal force $$N$$?

Accepted Answer

It decreases

Question 13

A 3 kg object is suspended by a rope. What is the tension in the rope if the object is at rest?

Accepted Answer

$$29.4\ \mathrm{N}$$

Question 14

A student claims that a heavier object will fall faster than a lighter one in the absence of air resistance. Which law refutes this claim?

Accepted Answer

Newton's second law

Question 15

A 4 kg block is pulled across a frictionless surface by a force of $$12\ \mathrm{N}. $$What is the acceleration of the block?

Accepted Answer

$$3\ \mathrm{m/s^2$}$$

Question 16

A block is at rest on an incline. Which of the following statements is true?

Accepted Answer

The net force on the block is zero

Question 17

A 2 kg object is moving at $$5\ \mathrm{m/s}. If a$$ $$10\ \mathrm{N}$$ force acts opposite to its motion for $$1\ \mathrm{s}$$, what is its final velocity?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 18

A person stands in an elevator that is accelerating upward. Which statement is true about the normal force $$N$$ acting on the person?

Accepted Answer

$$N is $$greater than $$mg$$

Question 19

A 6 kg block is at rest on a horizontal surface. If a horizontal force of $$18\ \mathrm{N} is $$applied and the block moves, what is its acceleration?

Accepted Answer

$$3\ \mathrm{m/s^2$}$$

Question 20

A 1 kg ball is dropped from rest. What is the net force acting on the ball as it falls (neglecting air resistance)?

Accepted Answer

$$9.8\ \mathrm{N}$$

Forces, Vectors, and Newton's Laws of Motion

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