PHYS 122 SL Midterm Review

True or False?  The area under the graph of an acceleration vs time graph represents displacement.

• True

• False

Which of the following are examples of vectors?

• Velocity

• Acceleration

• Position

• Force

• Time

How many significant figures are in the number 2.001450030?

• 10

• 5

• 7

• 6

• 4

What is the object’s speed at t= 3s?

• -3 m/s

• 3 m/s

• 0 m/s

• 2 m/s

• None of the above

True or False: Objects need to be pushed at a constant net force for them to move at a constant velocity.

• True

• False

What does Newton’s Third Law of Motion state?

• An object will not change its motion unless acted upon by a force

• ∑F= ma

• Two interacting objects apply equal and opposite forces on one another

• All objects experience a constant force of gravity

• The size of a force is proportional to an object’s speed

Which of the following statements is true about an object in free fall?

• Air resistance can always be neglected

• Acceleration is constant

• Velocity is constant

• The object reaches is maximum speed at the top of its trajectory

• An object experiences a negative acceleration on the way up, and a positive acceleration on the way down

Consider a soccer ball and a tennis ball dropped at the same time from a very tall building.  Which object will hit the ground first?

• The soccer ball because its higher mass allows it to undergo a greater acceleration

• The tennis ball because it is smaller and lighter

• The soccer ball because it is able to overcome air resistance more easily

• The tennis ball because it has less surface area

• Both objects will hit the ground at the same time

An object accelerates at 35 km/h². What is its acceleration in m/s²?

• 4.310^-3m/s²

• 2.710^-3m/s²

• 6.810^-3m/s²

• 2.710³m/s²

• 4.310³m/s²

 True or False?  An object may experience more than one normal force at the same time.

• True

• False