Name__________
FORCES AND MOTION RETEST
Directions: Match the vocabulary word to the correct definition.
1. _____ Gravity A) This causes all changes in speed and
direction of an object.
2. _____ Force B) This is the pulling force that every object exerts
on every other object. It pulls us toward the
center of the earth.
3. _____ Buoyant Force C) This causes objects to be at rest or traveling at
constant speed.
4. _____ Friction D) This is friction between an object and air.
5. _____ Balanced Forces E) This is a push or pull that causes an object
to move or change shape.
6. _____ Magnetic or F) This is an upward force that an object
Electrostatic force experiences when it is in a liquid or a gas.
7. _____ Air Resistance G) This is a force that opposes (tries to stop) the
motion between two surfaces that are touching.
8._____ Unbalanced Forces H) These forces do not need to touch objects to
exert a force. (push or pull)
Directions: Categorize the following as balanced forces or unbalanced forces.
Place a B next to the balanced forces and a U next to the unbalanced forces.
___ A satellite orbiting the earth.
___ A hat sitting on someone’s head.
___ A car swerving around a dear on the road.
___ Dinner plates sitting on the table.
___ A beauty contestant tripping and falling off the stage.
Directions: Answer the following questions. Read the directions carefully.
1. In the space below, draw a picture of a person kicking a kickball into the outfield. Show the path the ball takes as it travels through the air and comes to a stop on the ground.
2. In the picture above, label the forces that affect the ball’s motion. Use the following words at least once: upward force, gravity, air resistance, and friction.
3. Look at the picture above, and write at least 3 sentences scientifically describing the ball’s motion from start to finish. Use at least 6 of the following words in your description: speed, up, down, gravity, curved path, slower, faster, balanced, unbalanced, pull, push, and friction. Circle the words used in your description.
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Directions: Answer the following questions. Choose the best answer.
___ 1. Which of the following items would produce the greatest amount
of friction when rubbed against another object?
A) vegetable oil B) wax C) sandpaper D) an ice cube
____2. When there is friction between two moving objects there is also:
A) an increase in speed B) heat
C) less pressure D) a change in the direction of movement
____3. True or False? The smaller an object’s mass, the greater its gravitational
pull.
____4. If you are in a car, and it gets stuck in the snow, and the tires are
spinning, you should:
A) Increase the friction between the tires and the snow by pouring oil under the tires.
B) Reduce the friction between the tires and the snow by pouring gravel under the tires.
C) Increase the friction between the tires and the snow by pouring cat litter under the tires.
5.Two cars are drag-racing on a dry race track. Both cars are identical in size and power. Car #1 weighs 2000 pounds and car #2 weighs 4000 pounds. The weigh is distributed equally on both cars, and all four tires stay on the ground when they take off. Which car will probably cross the finish line first, car #1 or car #2? _____________________
Why? ________________________________________________________
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