Unit 1 Test: 8th Physical Science

What is the formula to calculate work?

• Work=Force × Distance
• Work=Mass × Velocity
• Work=Speed × Time
• Work=Acceleration × Time

In this speed over time graph. What is happening in section A?

• They are speeding up.
• They are moving at a constant speed.
• They are slowing down.
• They are stopped.

In this speed over time graph. What is happening in section B?

• They are speeding up.
• They are moving at a constant speed.
• They are slowing down.
• They are stopped.

In this speed over time graph. What is happening in section D?

• They are speeding up.
• They are moving at a constant speed.
• They are slowing down.
• They are stopped.

Buckets with varying weights are being moved a distance of 2m. Using the formula to calculate work: How much work was done to move the 5 kg bucket?

• 50J
• 100J
• 200J
• 150J

Which of the following units is used to measure work?

• Newton
• Joule
• Watt
• Meter

How does increasing the distance an object is moved affect the work done, assuming force remains constant?

• Decreases the work done
• Does not change the work done
• Increases the work done
• Reduces the force needed

If a car travels 60 km in 3 hours, what is its average speed? S=D/T

• 60 km/h
• 20 km/h
• 180 km/h
• 30 km/h

What is the term used to describe: The rate at which an object changes its position.

• Velocity
• Acceleration
• Speed
• Displacement

What is the term used to describe: The rate at which an object changes its velocity.

• Velocity
• Acceleration
• Speed
• Displacement