practice physics final #1

A skier skis downhill with an acceleration of 3 m/s/s. How fast will she be going 4 seconds after starting from rest?

• 1.333 m/s
• 7 m/s
• 0.75 m/s
• 12 m/s

As an ice hockey puck moves across the ice, which of Newton's three laws of linear motion best describes why it moves the way it does?

• First—Law of Inertia
• Second—Fnet=m·a
• Third—Action<>Reaction
• Fourth—Constant Temps.

According to the speed vs time graph for a test rocket, what's the net force acting on the rocket after about 3 years?

• 100
• 0
• 80
• You can't tell

As the ice skaters perform an "illegal" headbanger spin, is there a net force acting on her?

• Yes, it's what keeps her moving in a straight line.
• No, She's not moving in a straight line.
• No, gravity from the Earth keeps her in a circular orbit.
• Yes, the applied force from the other skater toward the center.

Throw a ball up into the air after doing 70 J worth of work on it. At its highest point, what will be its kinetic energy?

• 70 J
• 35 J
• 0 J
• Unknown

The units for momentum are

• kg
• m/s
• kg-m/s
• kg/m/s

In this type of collision, objects tend to "stick" together.

• elastic
• inelastic 
• They "stick" together in both types of collisions

When the speed of an object is doubled, its momentum

• remains unchanged in accord with the conservation of momentum.
• doubles
• quadruples
• decreases

At which point is potential energy greatest

• W
• X
• Y
• Z

When a pendulum swings, at which point is kinetic energy highest: 

• 1
• 2
• 3
• 4