Kinetic energy
What happens to kinetic energy if an object moves faster?
A) It increases
B) It decreases
C) It stays the same
A) It increases
An object speeding up is…
A) Accelerating
B) At rest
C) Balanced
Answer: A) Accelerating
What is the force that pulls objects toward Earth?
A) Friction
B) Gravity
C) Tension
Answer: B) Gravity
What kind of energy is stored due to height?
A) Kinetic
B) Gravitational potential
C) Electrical
B) Gravitational potential
Which has more kinetic energy?
A) A kid running
B) A kid standing still
A) A kid running
If something isn’t moving, its kinetic energy is…
A) High
B) Low
C) Zero
C) Zero
If a car moves at the same speed and direction, it’s showing…
A) Acceleration
B) Constant motion
C) Random motion
Answer: B) Constant motion
Which force slows things down when they slide?
A) Gravity
B) Friction
C) Push
Answer: B) Friction
What type of energy does a rock sitting at the edge of a cliff have, and why?
Gravitational potential energy, because it has the potential to fall due to its height
Why do helmets protect your head?
A) They add style
B) They reduce impact force
C) They make you faster
B) They reduce impact force
Which object has more kinetic energy?
A) A fast soccer ball
B) A slow soccer ball
Answer: A) A fast soccer ball
True or False: If you’re moving, you have speed.
Answer: True
True or False: A bigger push means more force.
Answer: True
Energy from moving objects is called…
A) Sound energy
B) Kinetic energy
C) Potential energy
B) Kinetic energy
Open-Ended: Why do you move forward when the car suddenly stops?
Because of inertia; your body wants to keep moving
Open-Ended: If two objects are moving at the same speed, which one has more kinetic energy: the heavier one or the lighter one?
Answer: The heavier one
Open-Ended: What must happen to an object for it to be considered in motion?
Answer: It must change its position over time
If something doesn’t move when you push it, the forces are…
A) Balanced
B) Unbalanced
C) Invisible
Answer: A) Balanced
True or False: Energy can change forms.
True
True or False: Jumping on a trampoline uses both kinetic and potential energy.
True
Open-Ended: What two factors affect how much kinetic energy an object has?
Answer: Mass and speed
Open-Ended: If a car is moving at a constant speed in a straight line, is it accelerating? Why or why not?
Answer: No, because its speed and direction are not changing
What happens when forces are unbalanced?
A) Nothing
B) The object moves or changes direction
C) The object disappears
Answer: B) The object moves or changes direction
Describe what happens to energy when you throw a ball up into the air.
Kinetic energy turns into potential energy as it rises
Open-Ended: What happens to the energy in your legs when you run and then stop suddenly?
The kinetic energy turns into heat and sound due to friction