Force and Changes in Motion

Lucy wraps a wire around a metal nail and connects the ends of the wire to the terminals on a batter. When she waves the nail over a metal paper clip, a force causes the paper clip to leap off the table and stick to the nail. When she disconnects the wire, a second force causes the paper clip to fall. Which 2 forces cause the motion of the paper clip?

• magnetism, then gravity

• friction, then magnetism

• pushing, then pulling

• gravity, then pushing

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Jake throws a ball to Luke, but it does not go far enough for him to catch it. What must Jake apply to his next throw in order for it to reach Luke?

• equal force

• greater inertia

• greater force

• less acceleration

Which type of force resists motion?

• gravity

• push

• pull

• friction

A team of movers needs to move a heavy bed. One mover puts slippery pads under each leg of the bed. This allows the bed to slide easily across the floor. How does the use of the pads change the forces involved with moving the bed?

• The friction force on the bed decreases.

• The magnetic force on the bed increases.

• The force of gravity on the bed decreases.

• The pushing force by the movers increases.

Joe is at the fair and sees twin roller coasters: one is an older coaster and the other is a new coaster that has recently been built and had its track oiled. Both coasters follow the same pattern of hills, drops, turns, and heights. However, each time the older coaster goes around the track it returns at a slower speed than the new coaster. Which of these explanations describes why the older coaster returns at a slower speed than the new coaster?

• The older coaster is coasting a longer distance than the new one.

• The older coaster has more gravity than the new one.

• The older coaster has a bigger hill than the new one.

• The older coaster experiences more friction than the new one.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Students are experimenting with a toy car on a smooth, wooden ramp that has a height of 1 meter. They apply a force of 2 Newtons (N) to the car to push it down the ramp. The students measure how fast it rolls down the ramp. They want to try to get the car to go even faster down the ramp. What could the students do in order to increase the speed of the car?

• Increase the friction of the car.

• Decrease the force applied to the car.

• Decrease the height of the ramp.

• Increase the force applied to the car.

Tags

NGSS.MS-PS2-2

The students in class are conducting an investigation to observe which toy truck would travel the greatest distance. The toy trucks are identical in every way except for mass. Each toy truck carries a different load. If the same amount of force is applied to each toy truck, which student's toy truck will MOST likely travel the greatest distance?

• Zachary's truck

• Alejandro's truck

• Tamika's truck

• Chantal's truck

Tags

NGSS.MS-PS2-2