Warm Up (force and motion)

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

6.8C- 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

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

6.8CD- What was the average speed of car A?

• 6 ft/s

• 2 ft/s

• 3 ft/s

• 12 ft/s

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

A student walking quickly while carrying an orange on his lunch tray stops suddenly. The orange will most likely roll off the tray due to

• inertia of the orange. 
• centripetal force of the orange
• the friction acting on the orange.
• the balanced forces acting on the orange.