In order for an object to change its speed or direction, an unbalanced force has to act on it
True
a push from the rubber band
Owen tried lifting weights. The weights did not move. Why?
Owen did not apply a force greater than the weights.
Your pushing a box of books up a ramp. What can you do so that it will take *less* force to push the box?
Remove some of the books.
Brian drops an orange to the ground. What force pulls the orange to the ground?
Gravity
An object moving through the air slows down because it is affected by the force of gravity
False
Why does a truck carrying a heavy load move uphill slower than an empty truck, even though the engine exerts the same force?
The force exerted by the engine has a smaller effect on the truck carrying a heavy load.
Explain why the flag in a game of tug-of-war stays in the same place, using academic vocabulary.
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When leaving the grocery store, why doesn't gravity pull the grocery bag you're carrying to the ground?
You're holding the bag up with an equal force to gravity.
Lily is bouncing a basketball. Which action should she use to make it bounce higher?
A. bounce the ball more times with the same force
B. bounce the ball fewer times with the same force
C. increase the force used to bounce the ball
D. decrease the force used to bounce the ball
The amount of friction exerted when an object moves across a surface depends on how the object and the surface rub together
True
Which of the following objects have the greatest change in motion?
A. A small force is applied on a an object with a large mass.
B. A small force is applied to an object with a small mass.
C. In the same direction as the the direction of the push.
D. In the opposite direction as the the direction of the push.
What will most likely happen if you increased the amount of force applied to an object?
Name a controlled variable in our balloon rocket lab and explain why it must be a controlled variable.
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What is it called when friction exists between air and a moving object?
air resistance
Jake is hitting a baseball. The faster he swings the bat, the farther the baseball travels. Which statement best explains why?
A boy uses a force to lift a heavy rock. What can the boy do if he wants to lift the same rock more quickly?
Use greater upward force
Jaden is building a doghouse. He is nailing on the roof. It took four hits to drive in the first nail. If he hits the second nail with greater force, which is most likely to happen?
Motion is the change of position in an object. AN object in motion can also have a change in direction. Which of these objects shows *only* a change in position?
B. a bus stopped at a light, then making a turn.
C. A train traveling south, then turning to the southwest.
D. an airplane traveling north at a speed of 200 miles per hour.
What two things affect an object's acceleration?
force and mass
Ms. Takahashi comes to an intersection and the light is green. She turns right without increasing or decreasing her speed. Which of these statements is true?
This car is moving in a straight line at a constant speed. Which of the motions described below does NOT require an unbalanced force?
The driver of a car uses the brakes to come to a stop. What change occurs if the driver applies less force to the brake pedal?
Kelly and Jane are being pushed on swings. The girls weigh the same, but Kelly swings much higher than Jane. Which of the following best describes how the girls are being pushed?
The jet engines of a moving plane exert a force to make the plane travel forward at a constant speed. Which of these changes to the jet is likely to happen if the engines exert a greater force?