Force and Motion Review

6.8C- Which two measurements are needed to determine the speed of an object?

• Position and time

• Distance and time

• Position and direction

• Distance and direction

6.8D- During a science experiment, a student dropped a metal ball from a height of 150 m. The graph shows the distance the metal ball traveled from its initial position to where it hit the ground.

What information does the graph give you about the speed of the metal ball over time?

• The ball travels at a constant speed.

• The speed of the ball increases over time.

• The speed of the ball decreases over time.

• e speed of the ball increases at first, and then decreases as time increases.

6.8C- An airplane leaves New York to fly to Boston. It travels 1,000 km in 2 hours. What is the average speed of the airplane?

• 500 km

• 1000 hours

• 500 km/hour

• 5000 hours/km

6. 8CD- The graph below shows the distance a car traveled in 5 seconds while moving on a freeway.

What was the car’s average speed?

• 0 m/s

• 14 m/s

• 28 m/s

• 30 m/s

The graph below represents the time and distance traveled by four different toy cars.

6.8C- Which car went the furthest distance (ft)?

• Car A

• Car B

• Car C

• Car D

6.8B- A box and forces are shown below. A box rests motionless on the ground. One student is pushing the box to the right with a force of 2 Newtons. The other student is pushing to the left with a force of 5 Newtons. In which direction and with what type of speed will the box move?

• It will move left

• It will move to the right

• It will float in the air

• It will not move

6.8B- An image of a toy rocket and forces are shown below. Assuming the only two forces on the toy rocket are lift and gravity, which of the following combinations would result in the rocket moving upward?

• Lift= 5 Newtons / Gravity = 5 Newtons

• Lift = 3 Newtons / Gravity = 4 Newtons

• Lift = 5 Newtons / Gravity = 4 Newtons

• Lift = 4 Newtons / Gravity = 4 Newtons

6.8E- The diagram shows an investigation in a science classroom.

Students pulled the same mass up an inclined plane propped up on five blocks, then six, seven, and eight blocks. Each time, they use a spring scale to measure the forces needed to pull the mass up the inclined plane. This investigation can show how which of the following affects the force needed to move an object up an inclined plane?

• The mass of the object

• The height of the inclined plane

• The length of the inclined plane

• The surface area of the object

If a car is moving on a highway at 70 kilometers per hour, going south, and then turns to travel 70 kilometers per hour, going east, what happens to its speed and velocity?

• Speed - changing, Velocity - constant

• Speed - constant, Velocity - changing

• Speed - constant, Velocity - constant

• Speed - changing, Velocity - changing

What is this graph showing?

• Gradually slowing down

• Gradually speeding up

• Constant speed

• Stopped