Motion & Newton's Laws

Question 1

If two objects have different masses, which object is easier to accelerate? Which law supports your answer?

Answer 1

The object with the least mass requires less force– 2nd law

Question 2

The tendency of an object to resist change in its motion is known as __________.

Answer 2

inertia (1st law).

Question 3

Speed equals distance divided by __________.

Answer 3

time

Question 4

On a graph showing distance versus time, a horizontal line represents an object that is __________.

Answer 4

not moving at all (at rest, stopped).

Question 5

Give an example of negative acceleration.

Answer 5

A car approaching a red light; a ball rolling to a stop.

Question 6

If a bicyclist travels 30 kilometers in two hours, her average speed is __________.

Answer 6

S = D/T 15 km/h.

Question 7

In speed-versus-time graph, a diagonal straight line shows that acceleration is __________.

Answer 7

constantly speeding up

Question 8

A person traveling in a car that stops suddenly keeps moving forward due to__________.

Which law is this?

Answer 8

inertia

Newton’s 1st Law

Question 9

If the action force of a bat striking a ball accelerates the ball in one direction, the reaction force accelerates the bat in the __________ direction.

Answer 9

opposite (3rd law)

Question 10

A roller coaster is moving at 10 m/s at the top of a hill and 22 m/s at the bottom of the hill two seconds later. What is the average acceleration? A=F(s)-I(s)/T _______

Answer 10

(22-10)/2= 6m/s^2

Question 11

The total distance traveled divided by the total time taken to travel the distance is __________.

Answer 11

average speed

Question 12

Newton’s first law of motion states that an object remains at rest unless a(n) __________ force acts on it.

Answer 12

unbalanced

Question 13

The statement “for every action, there is an equal but opposite reaction” is a statement of Newton’s ___ law.

Answer 13

3rd

Question 14

When a swimmer pushes the water back, the water pushes the swimmer forward. What is the reaction force in this situation?

Answer 14

The water pushing the swimmer forward. (opposite)

Question 15

If you push a skateboard that has a mass of 60kg with a force of 6N, what force will the skateboard push back on you according to Newton’s third law of motion?

Answer 15

6N (It’s equal because of 3rd law.)

Question 16

Forces that are equal in size but opposite in direction and cause no change in motion are ________ forces.

Answer 16

balanced

Question 17

Define displacement. Displacement is the distance and direction an object is from starting point to stopping point.

Answer 17

Displacement is the distance and direction an object is from starting point to stopping point.

Question 18

What is the key factor in determining if an object is in motion?

Answer 18

Change in position relative to a reference point

Question 19

What is the motion of an object with zero acceleration?

Answer 19

At rest or at a constant speed (no change in motion)

Question 20

What is the acceleration formula?

Answer 20

A = (final speed – initial speed) / time