# Science Check answer

posted by
**Jman**
.

******I WILL GIVE MY ANSWERS AFTER I POST THE QUESTIONS******

1. Momentum is a measure of ____.

how hard it is to stop an object

the amount of matter in an object

the tendency of an object to change its motion

the amount of force acting on an object

Use the following equation to answer question 2:

acceleration (in meters/second2) = net force (in newtons)

mass (in kilograms)

2. A 300-N force acts on a 25-kg object. The acceleration of the object is ____.

7,500 m/s²

300 m/s²

25 m/s²

12 m/s²

3. The statement "for every action, there is an equal but opposite reaction" is a statement of ____.

the law of conservation of momentum

Newton's first law

Newton's second law

Newton's third law

4. A fixed, single pulley that is used to lift a block does which one of the following?

doubles the force required to lift the block

decreases the force required to lift the block

makes the block easier to lift by changing the direction of the force needed to lift it

decreases the force required and changes the direction of the force required

5. A heat engine ____.

changes mechanical energy to thermal energy

changes mechanical energy into electrical energy

changes thermal energy into mechanical energy

changes kinetic energy into thermal energy

6. Inertia _____.

depends on direction

depends on momentum

resists a change in motion of an object

both a and b

7. When a toy truck collides into a toy car, the momentum of _____ is the same before and after the collision.

the truck

the car

the truck multiplied by the car

the truck plus the car

8. Air resistance _____ as you move faster.

increases

decreases

remains the same

eventually disappears

9. A slanted surface used to raise an object is a(n) ____. (1 point)

efficiency board

effort ramp

inclined plane

wedge

10. A bar that is free to pivot about a fixed point is a _____.

fulcrum

lever

ramp

wedge

11. When two or more simple machines work together they are called a(n) _____.

effort-boosting machine

simpler machine

compound machine

advanced machine

12. In a diesel engine, the fuel is ignited by _____.

spark plugs

compression

expansion

grow plug

☺☺☺☺☺THAT'S ALL THE Q's☺☺☺☺☺

Additional Details added 2 mins ago

1. A

2. D

3. D

4. C

5. C

6. D

7. D

8. A

9. C

10. A

11. C

12. ?