DP 014 2019/2020 v.2

Which of the following is a vector quantity?

• Energy

• Time

• Velocity

• Temperature

When two vectors with same magnitude are added together, their resultant is a minimum when the angle between them is

• 0

• 45°

• 90°

• 180°

The following graph represents the position as a function of time for a moving object. Which of the following is true?

• The object increases its velocity

• The object decreases its velocity

• The object’s velocity stays unchanged

• The object stays at rest

An object moves with a constant acceleration of 5 m/s². Which of the following statements is true?

• The object’s velocity stays the same

• The object moves 5 m each second

• The object’s acceleration increases by 5 m/s² each second

• the object’s velocity increases by 5 m/s each second

The momentum for any object is calculated by

• dividing mass by velocity

• multiplying mass by velocity

• multiplying mass by acceleration

• dividing force by acceleration

An inelastic collision conserves

• momentum but not KE

• both momentum and KE

• KE but not momentum

• neither momentum nor KE

Describe the motion of a person not wearing a seat belt if the car stops suddenly.

• The person and car will stop together.

• The person will stop faster than the car because they are lighter.

• The car will stop and the person will keep moving forward because of inertia

• The car will stop and the person will speed up

Which force would have to increase to make the car accelerate?

• A

• B

• C

• D

A force of 1.0 N acts on a 1.0-kg object that can move freely. The object's acceleration is

• 0.102 m/s²

• 0.5 m/s²

• 1.0 m/s²

• 9.8 m/s²

An object I with a mass of 4 kg is lifted vertically 3 m from the ground level; another object II with a mass of 2 kg is lifted 6 m up. Which of the following statements is true?

I. Object I has greater potential energy since it is

heavier

II. Object II has greater potential energy since it is lifted

to a higher position

III. Two objects have the same potential energy

• I

• II

• III

• I & II