Unit 5 Forces and Motion Mixed Review

A bird is flying through the air. In which direction does thrust act on the bird?

• backward 
• downward
• forward
• upward

What change could the skateboarder make to increase the speed of the skateboard?

• Make the ramp not as steep. 
• Add six more wheels to the skateboard.
• Begin skateboarding from the middle of the ramp. 
• Wear a heavy backpack while skateboarding on the ramp. 

A hot air balloon is floating in the air. A person riding in the balloon’s basket throws a heavy bag of sand out of the basket. What effect will this most likely have on the balloon?

• decrease the effect of lift 
• increase the effect of gravity 
• increase the effect of friction 
• decrease the effect of gravity 

A girl is riding a bicycle along a path. When she moves off the path and onto grass, her speed decreases. What caused the change in her speed?

• decrease in lift 
• increase in friction 
• increase in gravity 
• decrease in mass 

During soccer practice, the manager measured the kicks of four different players. The table shows the times for the fastest kick of each player.  Which player kicked the ball with the greatest force?

• Will
• Kyle
• Corey
• Teri

A car traveling down a road approaches a red light and stops. What causes the car’s speed to change?

• a decrease in drag
• an increase in drag
• an decrease in friction
• an increase in friction

The table shows the schedule for four busses.  If the busses follow the times on their schedules, which will have the fastest average speed along its route?

• Bus 1
• Bus 2
• Bus 3
• Bus 4

Students in a class compare the average speeds of four toy cars rolling along the floor. The data table shows their measurements.  Which cars moved at the same speed?

• blue and green
• orange and yellow
• blue and orange
• green and yellow

Mrs. Panetta’s science class was studying motion. Four students timed a tennis ball as it rolled across the floor. The data table shows the results of their experiment.  Which students had tennis balls that rolled at the same speed?

• Alicia and Alex
• Lucy and Jorge
• Alex and Lucy
• Alicia and Jorge

Students in a class are designing a model amusement park ride. A force starts a cart moving. The cart then needs to slide along a rail and hit against a barrier. How could they prevent damage to the cart when it hits the barrier?

• Increase the acceleration of the cart as it approaches the barrier. 
• Make the rail smoother to change the amount of friction between the cart and rail. 
• Make the barrier out of foam so that it will absorb the force of the cart slowly.
• Decrease the length of the rail so that the cart has less time for its speed to increase.