Skills Check #4

A racecar is traveling around a racetrack at a constant speed of 150 km/hr. At which point on the track is the car accelerating?

• At point A
• At point B
• At point C
• The car is not accelerating.

A racecar is traveling around a racetrack at a constant speed of 150 km/hr. At which points is the velocity of the car the same?

• Points A and B
• Points A and C
• Points B and C
• The velocity is not the same at any of the points.

According to the above graph, what is the average speed of the car after 3 seconds?

• 30 m/s
• 15 m/s
• 5 m/s
• 3 m/s

According to the graph above, what is the acceleration of the car between 2 seconds and 5 seconds?

• 30 m/s²
• 15 m/s²
• 5 m/s²
• 0 m/s²

A student pushes a box with a force of 16N to the left. Another student pushes the same box from the opposite side with a force of 18N to the right. What will be the result?

• The box will move to the right with an 8 N force.
• The box will move to the right with a 2 N force.
• The box will move to the left with a 2 N force.
• The box will move to the left with an 8 N force.

A marble is rolling east along the floor at a speed of 0.5 m/s. If a student exerted a force of 1 N towards the north, what would be the effect on the speed and direction of the marble?

• The speed of the marble would be unchanged, and the direction would change to the NE.
• The speed of the marble would increase, and the direction would change to the NE.
• The speed of the marble would be unchanged, and the direction would change to the N.
• The speed of the marble would increase, and the direction would change to the N.

How many atoms of hydrogen are in ethanol, C₂H₅OH?

• 0
• 2
• 5
• 6

When an object is acted upon by unbalanced forces, the object will always...

• Accelerate
• Continue in the same direction
• Continue at the same speed
• Come to a stop

What is the chemical formula for Methane?

• CH₈
• C₈H₄
• CH₄
• C₈H₈

Which of the following statements best describes how the speed & velocity of an object differ?

• Velocity is speed & direction, while speed has no direction
• Velocity is speed, while speed includes a direction
• Velocity is change in speed & speed is change in distance
• Velocity is change in distance & speed is change in velocity