Forces and Interactons

Question 1

Friction

Answer 1

Resistance cause by any two objects in contact

Question 2

Unbalanced forces

Answer 2

Forces that cause a change in motion of an object

Question 3

Balanced forces

Answer 3

Equal forces acting on an object in opposite directions

Question 4

Newton’s first law of motion

Answer 4

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Question 5

Newton’s Second Law of Motion

Answer 5

The acceleration of an object depends upon two variables - the net force acting upon the object and the mass of the object.

Question 6

Newton’s third law of motion

Answer 6

For every action, there is an equal and opposite reaction

Question 7

Inertia

Answer 7

The tendency of an object to resist a change in motion.

Question 8

Force

Answer 8

A push or a pull, labeled in newtons.

Question 9

Mass

Answer 9

The amount of matter in an object.

Question 10

Acceleration

Answer 10

Rate of change in velocity, labeled m/s 2

Question 11

Contact forces

Answer 11

Puses and pulls that result from direct touching of objects (friction, air resistance, and physical contact wit an object)

Question 12

Non-contact forces

Answer 12

Pushes or pulls that result without the direct touching of objects acting at a distance (gravity and magnetism)

Question 13

Gravity

Answer 13

A force of attraction between objects that is due to their masses.

Question 14

Forces that cause a change in the motion of an object are called ____________________ forces.

Answer 14

Unbalanced

Question 15

Equal forces acting on an object in opposite directions are called _________________ forces.

Answer 15

Balanced

Question 16

Is this Newton’s 1st, 2nd, or 3rd law?

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force is known as which Law of Motion?

Answer 16

1st law

Question 17

The tendency of an object to resist a change in motion: ____________________is described in which Law of Motion?

Answer 17

Inertia, 1st law

Question 18

Which law describes the relationship between force, mass, and acceleration?

Answer 18

2nd law

Question 19

Which law describes why we fly forward when a vehicle suddenly stops?

Answer 19

1st law

Question 20

When the engines in a rocket ignite, the rocket lifts off. Which law describes why this happens?

Answer 20

3rd law

Question 21

It is easier to push a small child on a swing than it is to push a larger child. Which Newton explains this phenomenon in which Law?

Answer 21

2nd law

Question 22

Which Newton’s Law explains the phenomenon in a a Newton’s Cradle when two balls collide they cause two balls on the opposite end to move?

Answer 22

3rd law

Question 23

As I stand on the ground, I push the ground with a force of 200 N, in turn, the ground pushes me with a force of _____ N.

Answer 23

200

Question 24

If I place a bowling ball in the center of the classroom, it WILL not move unless a force acts upon it. Which term BEST explains this phenomenon? _______________________________

Answer 24

Inertia

Question 25

A 12th grader and a 2nd grader are pulling back and forth fighting over a basketball. The 12 grader wins. This is an example of________________________ forces.

Answer 25

Unblanced

Question 26

If the mass is the SAME, a GREATER force will cause LESS acceleration True False

Answer 26

False

Question 27

17. If you push an object, that object pushes back in the opposite direction equally hard. True False

Answer 27

True

Question 28

18. Forces always act in pairs True False

Answer 28

True

Question 29

19. To slow an object down, you need an applied force in the opposite direction. True False

Answer 29

True

Question 30

20. Action force = bowling ball hitting pins, the reaction force = pins flying in all directions. True False

Answer 30

False

Question 31

21. When force is held constant, an object of greater mass will accelerate faster. True False

Answer 31

True

Question 32

Solve the following problems. The formulas have been provided for you. You MAY use a calculator. **Be sure to label your answers!** -Calculating Force (Label your answers with N for Newtons. A 1250 kg car accelerates at a rate of 5.0 m/s2. How much force is the car’s engine producing? (Force = Mass x Acceleration)

Answer 32

F = ma F = 1250 x 5 F = 6250 N

Question 33

Calculating Acceleration (Label your answers with a m/s2 for Acceleration) What is the acceleration of a 400 g marble that is being pushed with a force of 2 N? (Acceleration = Force / Mass)

Answer 33

a = f/m a = 2/400 F = 0.005 m/s 2

Question 34

What is the formula for net force?

Answer 34

-Subtract the highest number to the lowest number - Whichever is te highest number at the end, is te direction it is going in.