Physics final

(Ch. 2) The use of inclined planes for Galileo's experiments helped him to

•  

  discover the concept of energy.

•  

  discover the concept of momentum.

•  

  eliminate the acceleration of free fall.

•  

  discover the property called inertia.

(Ch. 2) Which of the following are in equilibrium? (You may select more than one answer.)

•  

  A car travelling at a steady speed of 60 mph on a straight road

• A car going in a straight road but slowing down for a traffic light

• A car turning a curve at a constant 30 mph speed

• A ball sitting on table

Tags

NGSS.HS-PS2-1

When you stand on TWO bathroom scales with one foot on each scale and your weight evenly distributed, each scale will read

• zero

•  

  half your weight

• twice your weight

• your weight

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NGSS.HS-PS2-4

(Ch. 2) The earth moves about 30 km/s relative to the sun. When you jump upward in front of a wall, the wall does not slam into you. This is because the wall

• has too little gravity to influence you

• has negligible inertia compared with the Sun

• and you are moving at the same horizontal speed before, during, and after your jump

• moves in an opposite direction to you.

(Ch. 2) A cart is pulled by a pair of 20 N forces that are perpendicular to each other, one to the West, the other to the South. What is the net force on the cart?

• 0 N

• 40 N

• 28 N

• 20 N

• 36 N

Tags

NGSS.HS-PS2-1

(Ch. 2) If an object is at rest on a surface, we can tell that

• the net force acting on the object is zero.

• gravity is the only force acting on the object.

• there is no force acting on the object

• no support force is acting on the object

Tags

NGSS.HS-PS2-1

(Ch. 2) If you toss a coin straight upward in a train that is speeding up quickly, the coin will land

• in your hand

• in front of you

• behind you

Tags

NGSS.HS-PS2-1

(Ch. 2) The scaffold is in mechanical equilibrium. The forces by the two painters, the weight of the scaffold, and the tension by the left rope on the scaffold are as shown. How much is the tension by the right rope?

• 800 N

• none of the above

• 500 N

• 300 N

Tags

NGSS.HS-PS2-1

(Ch. 3) You throw a rock upward with a speed of 30 m/s. How long until the rock reaches its maximum height?

• 1 s

• 2 s

• 3 s

• 4 s

• 5 s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

(Ch. 3) Which undergoes greater acceleration: a car that speeds from 55 km/h to 60 km/h in 10 s or a bicycle that goes from 0 km/h to 5 km/h in 5 s?

• the car

• the bicycle

• both the same

• need more information

Tags

NGSS.HS-PS2-1